Trading and networking jobs in United Kingdom

Principal or Associate Electrical Engineer Data Centres and Mission Critical London About us Hoare Lea is a human-centric and planet-conscious engineering consultancy. We offer intelligent and sustainable solutions to complex design challenges for the built environment throughout the UK and further afield. We provide a wide range of engineering and consultancy services, including acoustics, air quality, building services (MEP), fire, lighting, security and sustainability to name but a few. Together, our highly skilled teams use technical expertise and problem-solving skills to bring buildings to life. We ensure that whatever the building, its design is outstanding, and its operations meet the needs of the communities it serves. We are as committed to inclusivity and flexibility as we are to sustainability and high performance. So, in joining Hoare Lea, you will experience a business that enriches your knowledge, supports your wellbeing, and welcomes your individuality. You’ll have the opportunity to participate in our 9-day fortnight scheme, our thriving community groups (ethnicity, families, gender, LGBTQ+, and neurodiversity), our varied social and networking events, and our extensive professional and technical development schemes. We also offer an extensive benefits package, including private medical cover, electric vehicle salary sacrifice scheme, stock options, and up to 30 days of annual leave. Whatever your ambitions or circumstances, our aim is to enable everyone to develop their knowledge, give their best, and enjoy what they do. About the role We have an exciting opportunity for a Principal or Associate Electrical Engineer to join our Data Centre and Mission Critical team. It's an exciting time to join the industry. Data centres are increasingly important to the economy, with the technology that drives them changing at a blisteringly fast rate, and our Mission Critical team assists clients in navigating the evolving requirements of this sector. Our experience covers everything in the Data Centre & Mission Critical sector – from complex live plant upgrades, close control, data halls, financial-sector trading floor environments, critical engineering, and due diligence reviews of existing facilities, you will get to work on projects across the UK, Ireland and Europe. Working collaboratively with our specialist groups, you will be joining a collaborative, knowledgeable, highly engaged team who love what they do. Our teams have a wealth of experience and offer a positive, supportive and flexible culture. Working alongside the Project Leader, you will be facing clients, responding to our clients’ needs, developing designs and producing reports, specifications and guidance or overseeing testing and commissioning activities. We work closely as a team to ensure we achieve the best results and deliver a consistent, high-quality service for our clients. In this key and varied role, you can expect to: • Be responsible for the day-to-day technical delivery of the electrical design services for data centre and mission-critical projects., • Lead the development of initial strategic concepts for projects ensuring solutions are appropriate for the brief and regulatory standards., • Interact regularly with internal and external stakeholders, ensuring a communicative, collaborative and timely approach to delivery. You will be in a client-facing role, attending project meetings and disseminating the brief to the project team., • Work with the team leader to help monitor fee expenditure, resources and work delivered., • Mentor and support our ‘next gen’ professionals, including apprentices and graduates. About you To be successful in this role, you’ll need: • Proven experience working as an Electrical Engineer or closely related role, with a track record delivering on Mission Critical and Data Centre projects., • Experience with modern technical delivery processes and use of relevant software/tools such as Revit, BIM, Electrical OM, Dialux and Relux., • Demonstrable experience working with clients/contractors/architects in a design-oriented / consultant role., • Self-awareness, an open mind, and a spirit of generosity, • Experience in supporting others to develop knowledge, skills, and confidence. How to apply To apply simply complete a CV profile and submit your application, or for further information please contact If shortlisted, one of our recruitment team will be in touch to arrange a introductory call (about 30 minutes) to discuss the role and your experience in more detail. From there, successful candidates will be invited to attend a panel interview, either via Microsoft Teams or in person at one of our offices. Adjustments and accommodations If there are adjustments or accommodations that we can put in place to help you participate and give your best at any stage of the recruitment process (whether relating to disability, neurodivergence or anything else) please let us know. Data privacy We have updated our terms and conditions for candidates, ___ Recruitment agencies We have a Preferred Supplier List of trusted partners who assist us when required. We do not acknowledge speculative CVs or unsolicited candidate introductions from agencies not on the list.

Java Software Engineer A leading trading firm in London is growing its engineering team and is looking for a high-performance Java Engineer to help build ultra-low-latency systems used directly on live trading desks. What You’ll Be Doing • Designing and building low-latency Java systems used in electronic trading, • Developing highly concurrent, multithreaded applications, • Optimising performance at the microsecond level, • Working closely with traders, quants, and infrastructure teams, • Improving throughput, stability, and execution speed, • Writing clean, well-tested production code What We’re Looking For • Strong commercial experience with Core Java, • Deep knowledge of multithreading, concurrency, and JVM internals, • Proven experience building low-latency / high-throughput systems, • Strong understanding of networking, memory management, and performance tuning, • Experience in trading, market data, risk, or execution systems preferred Nice to Have • Experience with FIX, market data feeds, or pricing engines, • Knowledge of Linux internals, • Background in finance, trading, or HFT environments What’s On Offer • £130k base, • Discretionary bonus, • 3 days a week in the office, 2 days a week WFH

DeFi Developer — High-Performance Crypto Trading Systems (London) Our client is hiring a sharp, ambitious DeFi Developer to join their DeFi trading team building high-performance systems that operate directly on decentralized markets. You’ll work hands-on across the full trading stack — from on-chain integrations and execution logic, to infrastructure, monitoring, and performance optimization. What you’ll do • Build and ship production-grade code (primarily Rust + Python), • Develop systems that interact with on-chain protocols and infrastructure, • (Solidity, JSON-RPC, Solana, MEV workflows, etc.), • Improve real-time monitoring, execution pipelines, and strategy tooling, • Debug and optimize end-to-end performance: latency, reliability, throughput, • Work with protocol teams and external projects to unlock new market opportunities, • Grow into end-to-end ownership across DeFi integrations and trading infrastructure Why this role is unique • Full systems exposure — infrastructure, execution, strategy logic, on-chain interaction, • DeFi at the core — learn how protocols work under the hood and how on-chain dynamics create edge, • Elite teammates — small, world-class group of engineers, quants, and traders, • Startup velocity — fast decisions, frequent shipping, immediate production impact This is an ideal role for someone who sees themselves as a top technologist and wants to work in one of the most cutting-edge environments in finance and crypto. What we’re looking for We’re looking for driven developers who want to learn fast by working on hard, meaningful problems. You should have: • 3–7 years of professional software engineering experience, • Strong fundamentals and ability to write clean, testable, efficient code, • Solid CS foundation: algorithms, data structures, concurrency, networking, etc., • Strong ownership mindset and clear communication Signals of technical excellence (any of these helps): • Top academic performance in CS / math / physics / engineering, • Competitive programming / olympiad success (ICPC, IMO, IOI, IPhO, etc.), • Experience at a highly selective tech company, trading firm, or fund Language & technical background • Rust preferred, but you should be strong in at least one systems/statically typed language:, • C++ / Java / Go / C# / Kotlin / similar Nice to have Strong preference • Understanding of trading systems, market structure, or strategy implementation Bonus • DeFi familiarity: smart contracts, blockchain APIs, MEV, Solana, • Rust experience, • Infrastructure/observability tools (AWS, Grafana, etc.), • Strong math/stats background (modeling, simulation) Team culture Our client values: • High ownership and initiative, • Curiosity, intellectual honesty, and rapid learning, • Clear, direct communication, • No ego, no politics — just building and improving together

This opportunity sits within a specialist FPGA engineering group supporting latency-sensitive trading systems. The role offers deep involvement across the full FPGA development lifecycle, working closely with software engineers and front-office trading stakeholders to deliver production-grade solutions. The successful candidate will contribute to the design, build, testing, and deployment of FPGA-based applications used across multiple trading strategies, with scope to take long-term ownership of critical systems. Key Responsibilities • Collaborate with software engineers and trading teams to design and deploy FPGA solutions across trading platforms, • Architect and implement FPGA applications end-to-end, including RTL design, synthesis, place & route, and static timing analysis, • Build and maintain shared testing and verification frameworks to ensure system robustness, • Support software integration by developing APIs and optimising hardware–software interfaces, • Identify and propose innovative solutions to hardware, FPGA, and system-level constraints, • Progress toward technical ownership of major FPGA applications or market-specific platforms over time Required Experience & Skills • 5–10 years’ experience as an FPGA engineer within defence, aerospace, telecoms, or research-driven environments, • Minimum 5 years of hands-on, full-time FPGA development experience using industry-standard tools and workflows, • Strong VHDL development skills, with supporting Python experience, • Comfortable working in Linux-based development environments, • Strong engineering discipline with a focus on clean design and maintainable code, • Proven experience working in collaborative, multi-disciplinary teams, • Deep expertise in at least one of the following: networking, computer architecture, or verification, • Working-level proficiency in C/C++, • Strong interest in financial markets and electronic trading systems Contact Ciara Clarke at Harrington Starr for a confidential discussion on this role.

This role is with one of Dex’s trusted Partner companies. We work closely with their teams to truly understand their culture, goals, and what they’re looking for, so we can match you with the right opportunity for your goals! If you’re interested, apply here, or head to the website, where you can sign up and speak to Dex. After your call, you'll be sent the full match details. We’ll help manage your applications, and find other great matches to work you'll love. The Opportunity Dex is partners with some of the world’s most prestigious quantitative trading firms and systematic hedge funds. These organizations operate at the absolute bleeding edge of technology, treating the global financial markets as a complex data science problem. They are deploying massive compute clusters and proprietary machine learning models to trade billions of dollars daily. If you're an engineer who cares about nanoseconds, cache locality, and architecting petabyte-scale infrastructure, this is the pinnacle of technical challenge. What You’ll Work On • Architect Low-Latency Infrastructure: Design and implement the critical path for trading execution, building order management systems and market connectivity layers where performance is measured in microseconds., • Scale Data Pipelines: Engineer elegant, distributed systems capable of ingesting and processing petabytes of market and alternative data, ensuring absolute consistency for research teams., • Operationalize Machine Learning: Bridge the gap between research and production by deploying complex ML models into live environments under strict latency constraints., • Optimize the Stack: Go "close to the metal" to optimize performance across networking, I/O, and compute layers, squeezing maximum efficiency out of hardware., • Build World-Class Observability: Create robust monitoring and telemetry systems to provide real-time insights into pipeline health, trading activity, and model behavior., • Work with the Best: Work side-by-side with world-class researchers and mathematicians to translate theoretical strategies into production-grade code. What You'll Have • Polyglot Mastery: Exceptional command of at least one major systems language (C++, Rust, Java) for low-latency components, or Python for data and ML workflows., • Distributed Systems Expertise: Deep experience building high-throughput, fault-tolerant systems using modern messaging standards (e.g., Kafka, ZeroMQ, NATS)., • Systems-Level Intuition: You are comfortable debugging and profiling at the OS level, understanding memory management, CPU architecture, and network stack optimization., • Data Infrastructure: Familiarity with the modern data stack, including time-series databases, object stores, and streaming frameworks like Apache Flink or Spark Streaming., • Engineering Rigor: You write clean, testable, and reliable code. You understand that in this environment, a system failure can cost millions in seconds., • Bonus - ML Engineering: Experience with model serving, feature stores, or integrating ML pipelines into live production systems is highly valued. (Note: Previous finance experience is not required). To be considered for this role and others like it apply directly, or sign up to Dex and we'll help find the work that matters to you!

Core C++ Developer | London | HFT Crypto Team | Up To £200k + Bonus We are currently working with a global digital asset trading and invest firm focused on cryptocurrency markets, systematic trading and venture investing. You will be an exceptional C++ developer responsible for the optimization of core high performance trading systems. The role is built on low latency infrastructure and will require you to have exceptional modern C++ knowledge. Day To Day: • Build and optimize low latency trading systems in C++ (17-26), • Work within order execution, market data and risk systems where every second counts, • Tune CPU, memory, threading and networking to squeeze out latency, • Work directly with a team of quants, traders and infra to improve speed, reliability and throughput., • Profile, benchmark and debug live systems What you’ll need: • Incredibly strong C++ (C++17+) with real systems level experience, • Solid experience in high performing low latency environments, • Good understanding of Linux, networking (TCP/UDP) and concurrency, • Prior experience in cryptocurrency or tradfi trading systems, • Tier 1 firms are preferred but not necessary If this sounds like you, apply now with your CV!

This role sits within an established FPGA engineering team supporting performance-critical trading systems. The position offers hands-on exposure across the full FPGA development lifecycle, working closely with software engineers and trading stakeholders to deliver production-ready solutions. The successful candidate will contribute to the design, implementation, testing, and integration of FPGA applications, gaining experience in low-latency systems while building a strong foundation within a collaborative engineering environment. Key Responsibilities • Work alongside software engineers and trading teams to design and deploy FPGA solutions across trading platforms, • Deliver FPGA applications end-to-end, including RTL design, synthesis, place & route, and static timing analysis, • Develop and maintain shared testing and validation frameworks, • Support FPGA–software integration by building APIs and optimising interfaces, • Identify and propose practical solutions to FPGA, hardware, and system-level constraints Required Experience & Skills • 2–3 years’ experience in FPGA engineering within defence, aerospace, telecoms, or research-driven environments, • Minimum 2 years of hands-on, full-time FPGA development experience, • Strong VHDL development capability with supporting Python skills, • Experience working in Linux-based development environments, • Solid engineering fundamentals with good coding and design discipline, • Comfortable collaborating within multi-disciplinary teams, • Working knowledge of networking, computer architecture, and verification concepts, • Prior exposure to C/C++ is beneficial but not essential, • Clear interest in technology-driven trading or financial markets Contact Ciara Clarke at Harrington Starr for a confidential discussion on this role.

Quantitative Developer – HFT (C++) | Ultra-Low-Latency Trading | High-Performance Systems We are looking for an experienced C++ engineer to join a high-performance trading team focused on building ultra-low-latency systems that operate at global scale. This is a unique opportunity to work on cutting-edge technology where every nanosecond counts. ⭐ The Role As part of the HFT team, you will: • Design, develop, and optimize latency-critical C++ systems for trading, market data, and infrastructure., • Work on end-to-end ultra-low-latency architectures, including kernel-level tuning, network optimization, and highly efficient system components., • Collaborate with FPGA engineers and hardware teams to integrate hardware and software pathways., • Profile and fine-tune performance across CPU, cache, and memory layers, ensuring maximum efficiency., • Contribute to the evolution of a high-throughput, front-office tech stack. 🎯 What We’re Looking For • 5+ years of experience in performance-critical C++ (C++17 or newer)., • Strong expertise in systems programming, memory management, and CPU architectures., • Deep knowledge of Linux internals, kernel parameters, and low-level profiling., • Passion for high-performance computing, networking, and hardware-software optimization., • Experience in systematic trading, HFT, or quantitative environments is a plus., • Proven ability to architect, optimize, and scale ultra-low-latency systems. 🌍 Why This Opportunity Is Exceptional • Work in a front-office, revenue-driving engineering environment., • Build and optimize state-of-the-art HFT systems across software, FPGA, and infrastructure., • Join a culture that values innovation, autonomy, and technical excellence., • Direct impact on strategy performance and technology evolution., • Opportunities to work in global offices. If you’re a C++ engineer excited by ultra-low-latency systems, HFT, and high-performance software design, this is a rare opportunity to make a tangible impact on a top-tier trading desk.

DevOps Engineer Skills: Deep Linux, Scripting - Python, DevOps, Kubernetes Salary: £200k Plus Location: London The ideal candidate comes from a top-tier tech environment (FAANG, elite trading, hyperscale infra). They have experience building technology 0→1, owning systems end-to-end, and working close to the metal. They will operate across everything from bare-metal Linux to modern build and observability stacks. Overview Join a core engineering group as an DevOps Engineer, deploying and scaling Linux platforms that underpin ML/AI-driven trading. You will own reliability for massive simulation, HPC, and production workloads—ensuring ultra-reliable, ultra-fast trading systems. This is a hands-on, leadership role focused equally on technical depth, strategic decision-making, and driving platform SRE excellence. Key Responsibilities • Lead SRE/DevOps practices for Linux platforms powering low-latency, high-throughput trading workloads., • Optimize, and tune Linux for performance, resilience, and minimal latency., • Drive incident response, root cause analysis, and continuous reliability improvement across production systems., • Oversee system automation and reproducibility—build, deploy, and fleet-manage bare-metal Linux and containerized stacks., • Manage and enhance Kubernetes clusters, network configuration, and large-scale orchestration., • Set observability standards; expand monitoring, alerting, and performance metrics across platforms., • Analyze networking, kernel-level performance, and distributed systems—solving core challenges in a multi-petabyte, multi-cluster environment., • Build Python tools for automation, reliability engineering, and performance analysis., • Design highly distributed systems What You Will Work On • Ultra-reliable, high-performance trading infrastructure where every engineering optimization affects performance, • Next-generation simulation and HPC compute pipelines, supporting ML/AI workflows at scale., • Integration and continuous improvement of internal and open-source tools for automation and reliability., • Strategic platform direction: shaping foundational systems for critical infrastructure in an elite trading environment. Team and Culture • Small, autonomous DevOps/SRE team with direct ownership and impact., • Collaborative engagement with quants, researchers, and trading experts to deliver robust platforms., • A culture built on deep technical ownership, learning, and high standards of performance engineering Apply now for an informal confidential chat!

Senior Software Engineer (Golang) London – Hybrid flexible Up to £80,000 + equity We’re currently partnered with a real-time sports data platform that is revolutionising how companies leverage data to empower their business. They are looking for a performance focused Senior Engineer with a passion for writing clean, efficient, and maintainable code. This is an exciting opportunity to join collaborative and innovative startup with opportunities for professional growth and learning. What You’ll Do • Design and develop high-throughput, low-latency APIs using Go., • Build and maintain real-time data ingestion and processing pipelines., • Optimise backend services for scalability, reliability, and millisecond-level performance., • Implement websocket and streaming endpoints for live data delivery., • Collaborate with front-end teams to power trading consoles and dashboards., • Profile and tune Go applications for performance and memory efficiency., • Ensure secure API design and compliance with data privacy regulations., • Contribute to architecture discussions, code reviews, and documentation. Key requirements • Strong experience with Golang in production environments., • Experience with VPS-based deployments., • Solid understanding of microservice architecture and distributed systems., • Knowledge of concurrency patterns and performance optimisation., • Experience with APIs, networking, and real-time data systems., • Familiarity with observability tools., • Ability to write clean, maintainable, and well-documented code. Nice to Have • Experience building high-throughput, low-latency APIs in Go., • Knowledge of real-time data ingestion and streaming pipelines., • Exposure to profiling and optimisation tools., • Understanding of fault-tolerant, scalable microservice architectures., • Experience with websocket or streaming endpoints for live data delivery., • Background in integrating APIs with external partners or platforms., • Awareness of observability best practices., • Knowledge of secure API design, authentication, and rate-limiting., • Interest in sports data. Why Apply? • Salary up to £80,000., • Remote working possibility & flexible hybrid set up, • London Office, • Opportunities for professional growth., • Strong Equity offering, • All expenses paid work trips to exciting locations., • A collaborative team where every role is respected equally., • Strong learning environment., • The ability to shape an early-stage start-up and contribute to building a company that puts its internal teams and customers first. This is an exciting opportunity for a Senior Software Engineer to help shape the future of a transformative real-time data platform. If you’re passionate about building world-class, high-performance systems and want to make your mark in a fast-growing tech company, we’d love to hear from you. **Unfortunately, due to high volume of applications, not all submissions will receive feedback

My client, a leading hedge fund, is seeking a Senior Infrastructure Engineer to join their in-house engineering team. This individual will be responsible for designing, implementing, securing, and managing modern infrastructure services - partnering closely with Information Security and Support to deliver reliable trading platforms across the enterprise. This is an opportunity to work hands-on with the latest Microsoft technologies - as well as core network infrastructure spanning LAN/WAN, Wi-Fi, firewalls, and cloud connectivity. You’ll contribute to service design and drive automation. The ideal candidate should bring strong TCP/IP networking fundamentals, proven scripting/automation skills (PowerShell or Python), and experience delivering cloud infrastructure (IaaS) and M365 deployments/migrations. Proficiency with Conditional Access, CI/CD pipelines, and Infrastructure-as-Code (e.g., Terraform) is essential. Additional exposure to Exchange Online/Server, Teams, SharePoint, OneDrive, desktop build/deploy automation (Windows 365/AVD), and config management tools such as Ansible or Puppet will be highly advantageous. To secure the most relevant hire, my client is committed to offering a highly competitive package alongside excellent benefits and a collaborative environment where engineers can thrive and make a visible impact. Apply now via the link below or send your CV directly to .

Principal or Associate Mechanical Engineer Data Centres and Mission Critical London About us Hoare Lea is a human-centric and planet-conscious engineering consultancy. We offer intelligent and sustainable solutions to complex design challenges for the built environment throughout the UK and further afield. We provide a wide range of engineering and consultancy services, including acoustics, air quality, building services (MEP), fire, lighting, security and sustainability to name but a few. Together, our highly skilled teams use technical expertise and problem-solving skills to bring buildings to life. We ensure that whatever the building, its design is outstanding, and its operations meet the needs of the communities it serves. We are as committed to inclusivity and flexibility as we are to sustainability and high performance. So, in joining Hoare Lea, you will experience a business that enriches your knowledge, supports your wellbeing, and welcomes your individuality. You’ll have the opportunity to participate in our 9-day fortnight scheme, our thriving community groups (ethnicity, families, gender, LGBTQ+, and neurodiversity), our varied social and networking events, and our extensive professional and technical development schemes. We also offer an extensive benefits package, including private medical cover, electric vehicle salary sacrifice scheme, stock options, and up to 30 days of annual leave. Whatever your ambitions or circumstances, our aim is to enable everyone to develop their knowledge, give their best, and enjoy what they do. About the role We have an exciting opportunity for a Principal or Associate Mechanical Engineer to join our Data Centre and Mission Critical team. It's an exciting time to join the industry. Data centres are increasingly important to the economy, with the technology that drives them changing at a blisteringly fast rate, and our Mission Critical team assists clients in navigating the evolving requirements of this sector. Our experience covers everything in the Data Centre & Mission Critical sector – from complex live plant upgrades, close control, data halls, financial-sector trading floor environments, critical engineering, and due diligence reviews of existing facilities, you will get to work on projects across the UK, Ireland and Europe. Working collaboratively with our specialist groups, you will be joining a collaborative, knowledgeable, highly engaged team who love what they do. Our teams have a wealth of experience and offer a positive, supportive and flexible culture. Working alongside the Project Leader, you will be facing clients, responding to our clients’ needs, developing designs and producing reports, specifications and guidance or overseeing testing and commissioning activities. We work closely as a team to ensure we achieve the best results and deliver a consistent, high-quality service for our clients. In this key and varied role, you can expect to: • Be responsible for the day-to-day technical delivery of the electrical design services for data centre and mission-critical projects., • Lead the development of initial strategic concepts for projects ensuring solutions are appropriate for the brief and regulatory standards., • Interact regularly with internal and external stakeholders, ensuring a communicative, collaborative and timely approach to delivery. You will be in a client-facing role, attending project meetings and disseminating the brief to the project team., • Work with the team leader to help monitor fee expenditure, resources and work delivered., • Mentor and support our ‘next gen’ professionals, including apprentices and graduates. About you To be successful in this role, you’ll need: • Proven experience working as a Mechanical Engineer or closely related role, with a track record delivering on Mission Critical and Data Centre projects., • Experience with modern technical delivery processes and use of relevant software/tools such as Revit, BIM and AutoCAD., • Demonstrable experience working with clients/contractors/architects in a design-oriented / consultant role., • Self-awareness, an open mind, and a spirit of generosity, • Experience in supporting others to develop knowledge, skills, and confidence. How to apply To apply simply complete a CV profile and submit your application, or for further information please contact If shortlisted, one of our recruitment team will be in touch to arrange a introductory call (about 30 minutes) to discuss the role and your experience in more detail. From there, successful candidates will be invited to attend a panel interview, either via Microsoft Teams or in person at one of our offices. Adjustments and accommodations If there are adjustments or accommodations that we can put in place to help you participate and give your best at any stage of the recruitment process (whether relating to disability, neurodivergence or anything else) please let us know. Data privacy We have updated our terms and conditions for candidates, ___ Recruitment agencies We have a Preferred Supplier List of trusted partners who assist us when required. We do not acknowledge speculative CVs or unsolicited candidate introductions from agencies not on the list.

Senior C++ Developer / Engineer (C++ Rust Low Latency Trading) London / WFH to £180k+ Are you a Senior C++ Developer to progress your career and transfer your skills to Rust? You could be joining a hugely profitable High Frequency Trading firm that specialise in crypto markets and earning substantial bonuses in a senior, hands-on Senior C++ Developer role. What's in it for you: • Salary to £180k, • Bonus (c50% of base), • Pension, • Hybrid working, • Career progression Your role: As a Senior C++ Developer you will design and develop high throughput backend services for microsecond real-time risk, pricing, trading engines and market making systems, working across the full software development lifecycle using Rust (and some C++ for legacy systems). You'll collaborate with a small, talented team, problem solving and working on complex and challenging systems with interesting work. Location / WFH: You'll join the team in Central London with flexibility to work from home 1-2 days a week. About you: • You have strong backend OOP, multithreaded software engineering experience with C++ and are comfortable working with Rust going forward, • You have experience of working on high throughput, low latency systems with microseconds / nanoseconds, within a finance (or games) environment, • You have a good understanding of low level system design, Operating Systems, Networking, Socket Level programming, hardware, compilers, FPGA, • You achieved a 2.1 or above in Computer Science from a top tier university, • You are collaborative and pragmatic with great communication and stakeholder management skills, also with some leadership or mentoring experience Apply now to find out more about this Senior C++ Developer / Software Engineer (C++ Rust High Frequency Trading) opportunity. At Client Server we believe in a diverse workplace that allows people to play to their strengths and continually learn. We're an equal opportunities employer whose people come from all walks of life and will never discriminate based on race, colour, religion, sex, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. The clients we work with share our values.

Role: Enterprise Sales Executive Location: London Salary: £50,000 to £100,000 depending on experience. On Target Commission: $200,000 per annum. Scope As a Sales Executive at Options Technology (“Options”) your role encompasses a range of dynamic responsibilities: • Create and manage a robust pipeline of business opportunities and cultivate valuable relationships., • Quarterly Closings: Achieve quarterly sales targets, both as an individual and as part of our cohesive team., • Negotiate Success: Drive business success by negotiating terms of sales and agreements., • Collaborate Actively: Engage hands-on with technical teams across Options to ensure seamless execution of sales strategies., • Embrace Innovation: Embrace technological innovation within the realm of capital markets, staying at the forefront of industry advancements., • Network: Attend events and represent the company at industry conferences., • Global Impact: Your contributions will have a global reach. We are in search of passionate individuals with a natural talent for sales, a deep understanding of financial markets and their participants, and the ability to propel our company's growth. Background Options is expanding its global enterprise sales team to meet soaring demand in the dynamic intersection of three high-growth market segments: Cloud (25.4% YoY growth), Managed Services (13.8% YoY growth), and Market Data (12.6% YoY growth). Join us to be part of this exciting journey, where you'll play a pivotal role in shaping the future of enterprise solutions. Who are Options? Options is the largest global financial technology company headquartered in Belfast. We are at the forefront of banking and trading infrastructure, serving clients globally with offices in New York, Chicago, Toronto, London, Cambridge, Paris, Hong Kong, Tokyo, Singapore, and Auckland. At Options, our services are woven into the hottest trends in global tech, including high-performance Networking, Cloud, Security, and AI (Artificial Intelligence). Unique to Options At Options, we provide an environment where exceptional sales professionals can thrive as integral members of a world-class team in a dynamic market segment: • Global Presence: A truly global business, with a presence in all major financial centres., • Great Products: Representing great products that resonate with customers., • Sales Momentum: The team has delivered the highest trailing 4Q sales totals in our history for the last eight quarters in a row., • Friendly Culture: We foster a sales-friendly culture where outstanding salespeople are recognized and appreciated., • Industry Leadership: We proudly serve a portfolio of 700 clients, including the top 40 global banks., • World-Class Sales Team: Our unwavering focus is on building a world-class enterprise sales team., • Tech Savvy: We highly value tech-savvy individuals who are naturally curious about technology and automation. Package • Competitive Salary: Depending on your seniority and experience, you can expect a salary ranging from £50,000 to £100,000., • Aggressive Commission: We offer a dynamic commission model with full lookback incentives as key targets are achieved., • Industry-Leading Benefits: Our benefits include generous maternity and paternity leave., • Equity Participation: Senior staff members may take part in equity ownership., • Global Opportunities: You have the possibility to work from key global business centres such as New York, London, and Hong Kong for up to 3 months each year. Enterprise sales at our company focuses on high-value contracts with recurring revenue streams and long-term partnerships. OTE Commission: $200,000 In any given year, approximately 20% of our global enterprise team achieves commissions of $300,000, with 2-3 executives surpassing $400,000. Preferred Requirements • 5+ years of hands-on experience in a client-facing technology role within the financial sector, ideally in sales, presales, product management, or technical account management., • A genuine passion for technology, particularly in the realms of data, Cloud, and AI., • An enthusiasm for business and investment, an avid reader., • The ability to excel in a fast-paced environment, consistently meeting quarterly targets as a valuable member of a high-performing team., • A self-starter mentality, thriving on initiative and autonomy., • An outgoing personality and a proven record as a collaborative team player. Ready to elevate your sales career to new heights? Apply now and become a vital part of our dynamic Enterprise Sales team, where your skills will shine on the global stage. 📮 How to Apply 📮 Upload your resume and a cover letter explaining why you are the perfect fit for this role to our Careers Page at . Your journey to enterprise sales excellence starts here. 💼 🚀

Why join AVA Energy? AVA Energy is one of the leading independent international energy recruitment agencies. We have a highly knowledgeable team made up of specialist consultants with many years’ experience within the energy industry. Established in 2012, we now have 45 employees and offices in both London and New York. We are Industry Leading Recruitment Specialists within the Renewables, Power Generation, Transmission & Distribution, Nuclear, Hydrogen, Energy Management, Energy Trading, Energy IT and Oil & Gas sectors. The AVA brand is synonymous with the highest standards in the industry, reflected in the principles and values of the directors and consultant team. Our bespoke Energy model ensures our clients see significant return on their investment whilst rewarding senior executives highly for exceptional delivery. The Role What does the role of a Trainee Recruitment Consultant involve? • Business development and lead generation, • Working to daily, weekly, and monthly targets, • Building a client and candidate base, • Gaining a client brief on candidate requirements, • Regular meetings with both clients and candidates to build rapport, • Producing job adverts for relevant platforms, • Sourcing candidates via headhunting, advertising, networking, and social media, • Qualifying and interviewing suitable candidates, • Manage the client's needs and expectations, • Arranging the interviews then closing the deal, • Working to improve recruitment efficiency About you • Bachelor's degree or 1 years' sales experience, • Quota or goal oriented, • Able to meet strict deadlines Independently motivated, • Team player, • Competitive, • Excellent communication and people skills with the ability to build and maintain relationships, • Money and target driven We have successful consultants in our team who have all joined from previous experience like estate agents, hospitality, care sales, cabin crew, sales Exec’s. As we provide all the training required for you to be successful within your role previous recruitment experience is not necessary. Benefits • 3pm Friday finish, • Discounted Virgin Active Gym Membership, • Gym Allowance, • 2 weeks off over Christmas, • Private medical, • Hybrid working, • Clear opportunities for progression with clear pre-defined career path, • Incentives, monthly lunch clubs and holidays, • NYC Relocation opportunity, • External training and further qualifications

Join a dynamic Core Development team that designs and maintains cutting-edge trading platforms. You will be responsible for optimizing trading engines, developing custom hardware solutions, and leveraging software, hardware engineering, data science, and research to build critical tools and infrastructure. As a C++ Software Engineer, your role will involve designing, building, and testing systems that power the trading platform. Working closely with traders, researchers, and engineers, you'll tackle complex challenges in CPU architecture, OS, networking, and hardware. We're looking for problem solvers who thrive in fast-paced environments and have a passion for learning. Key Skills: • 2+ years of modern C++ development in Linux environments., • Strong knowledge of computer systems, including OS, networking, and performance tuning., • Experience with Object-Oriented design and multi-threaded programming.

We are seeking an exceptional C++ Engineer to join one of the world's most advanced high-frequency trading firms. This is a rare opportunity to work at the intersection of cutting-edge technology and global financial markets, where performance is measured in nanoseconds and innovation drives competitive advantage. You'll be part of a team that designs and builds ultra-low latency trading systems deployed across global exchanges. Your work will directly impact trading performance, and you'll be empowered to push the boundaries of what's possible in software and hardware optimisation. Key Responsibilities • Architect and implement high-performance C++ systems with extreme latency sensitivity., • Optimise every layer of the stack - from CPU cache and memory allocation to kernel bypass and network I/O., • Collaborate with traders, quants, and infrastructure engineers to deliver robust, scalable, and lightning-fast trading solutions., • Profile, benchmark, and tune systems using advanced tooling and custom diagnostics., • Contribute to the design of proprietary protocols, lock-free data structures, and real-time analytics pipelines. Ideal Candidate • Expert-level proficiency in modern C++, with a deep understanding of low-level systems programming., • Strong grasp of computer architecture, concurrency, and performance engineering., • Experience with kernel bypass technologies (e.g., DPDK, Solarflare/OpenOnload) and high-performance networking., • Familiarity with Linux internals, NUMA, CPU affinity, and custom memory management., • Proven track record of building latency-critical systems in trading, gaming, or telecom environments., • Bonus: Experience with FPGA acceleration, RDMA, or custom NIC firmware. Why Apply? • Work with some of the fastest systems and smartest minds in the industry., • Direct impact on trading performance and strategy execution., • Access to bespoke infrastructure, bleeding-edge hardware, and proprietary tooling., • Culture of excellence: flat structure, minimal bureaucracy, and relentless focus on performance., • Compensation at the top end of the market, with significant upside tied to impact. Apply Now!

We are working with a pioneering financial technology firm that is building a global institution for digital assets, designed from the ground up for market integrity and efficiency. Their disciplined, first-principles approach underpins everything they do - from institutional liquidity provision and trading solutions to OTC execution and treasury management. As part of their continued growth, they are seeking a Senior Exchange Connectivity Engineer to join their London office. This role sits at the heart of their trading infrastructure, focusing on ultra-reliable, low-latency integrations with major crypto exchanges. Key Responsibilities • Design and implement exchange connectivity modules (REST, WebSocket, FIX, proprietary APIs)., • Optimize order entry, market data ingestion, and account management for performance and reliability., • Contribute to a fault-tolerant, scalable connectivity framework using Rust and Typescript., • Collaborate with trading, infrastructure, and product teams to deliver high-quality integrations., • Monitor, debug, and continuously improve production systems., • Mentor junior engineers and help shape engineering best practices., • Participate in on-call rotations and occasional travel as needed. Ideal Candidate Profile • 3-5+ years of professional software engineering experience., • Minimum 1 year of hands-on experience integrating with crypto exchanges., • Strong understanding of networking fundamentals (HTTP, WebSocket, TCP, TLS)., • Proficiency in Rust or a strong C++ background with exposure to Rust., • Working knowledge of Typescript. Nice to Have • Experience with Web3 / DeFi protocols., • Leadership or mentoring experience., • Familiarity with traditional finance connectivity protocols (ITCH / OUCH / UDP Multicast). This is a unique opportunity to join a high-impact team shaping the future of digital asset infrastructure. If you're passionate about building robust systems and thrive in a fast-paced, collaborative environment, we'd love to hear from you.

Your day-to-day will be networking and forming relationships with some of the most sought-after financial professionals in London: placing them into top roles within Investment Banks, Hedge Funds and Prop Trading Firms. If you are motivated by personal growth, high earnings, and a dynamic working en

Linux Systems & Infrastructure Engineer Hybrid – London £45–50k base + bonus FinTech We’re building something special, and we want someone like you at the center of it. Our platform is used by tier-one banks, hedge funds, and trading firms to identify latency bottlenecks and other issues in high-performance electronic trading environments. Instead of throwing money and hardware at problems, our platform quickly identifies the real issues with insight only a team of trading system performance engineers and ex-technical traders can provide. We’re now expanding, developing our Cloud/SaaS offering, and scaling globally with support from industry leaders who have already validated our product as a category leader from a technical perspective. The Role We’re looking for a Junior Linux Systems & Infrastructure Engineer with some exposure to capital markets. This is a hands-on role in a fast-moving environment, so you’ll need to be curious, adaptable, and ready to learn quickly. You’ll get plenty of support, but also real responsibility from day one. You will: • Own and evolve internal infrastructure, • Support future client deployments, • Contribute to tooling for the Cloud solution, • Work directly with highly-experienced engineers and ex-traders, • Take on real responsibility, fast Tech you'll work with day-to-day: • Linux | Networking | Firewalls, • Kubernetes | Containers | Ansible, • Databases (SQL/NoSQL), • Python and Shell, with exposure to GoLang & C++, • Cloud infrastructure (design, implementation & optimisation), • Optional: AI-based tooling development Working Style Hybrid, 2 days per week in the office for hands-on mentorship and exposure to deep-domain knowledge. You’ll be learning from people at the bleeding edge of electronic trading systems monitoring. If you enjoy a little chaos, speed, and ownership, you’ll thrive here. What’s in it for you? This is a rare chance to learn from top engineers in capital markets monitoring, gaining early exposure to high-performance, real-time trading systems. You’ll work hands-on with Linux, network analysis, SQL, Python, time-series databases, and an award-winning observability platform, contributing to client POCs and live deployments. From configuring instrumentation paths and dashboards to delivering actionable insights, you’ll take ownership of meaningful work and accelerate your growth in both technical and client-facing skills. Other benefits include: • Up to £50,000 (BOE), • 28 days holiday + bank holidays, • Pension contribution If you’re hungry, switched-on, and excited to build in an environment of positive chaos, we want to hear from you! Apply via this advert. .