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Senior Backend Engineer – High-Scale Systems | Python & FastAPI | Security SaaS. Senior Backend Engineer – High-Scale Systems | Python & FastAPI | Security SaaS. They've completed Series A funding, raising $29 million across three funding rounds, and are now seeking a Senior Backend Engineer.

The role involves the design and development of backend services and infrastructure for Machine Learning workloads.

Our frontend is React with Typescript, and you will be expected to contribute small features to the frontend (though the role is at least 95% backend). You're an experienced engineer with multiple years of working in startups as a backend engineer;. Our backend tech stack is Spring Boot with Java/K

Software Architect Java - BackEnd, Back End Google Cloud (GCP)Contract: Until December 2026 - RenewableLocation: Essex Offices (located between Brentwood and Basildon) 4 days a weekRate: £600 per Day Inside IR35The finance and banking division of this engineering company and household name is se

A leading recruitment agency is seeking an experienced Senior Back-End Java Developer to support a significant Government transformation programme in the UK.The role involves delivering enhancements and contributing to a cloud-based IDAM service using Azure Kubernetes.Candidates should have strong b

The successful candidate will design, develop, and maintain secure, high-performance backend systems, including microservices and APIs.

The role offers the opportunity to design scalable backend systems in a remote-first or hybrid environment.

A leading financial services company in Greater London is seeking an experienced Engineering Lead to support its growth.The successful candidate will manage software delivery, build high-performing teams, and define technical solutions.With a hybrid working environment, the company offers a competit

A fast-growing finance company in Greater London is looking for an Entry Level Back End Acquisition Tech Developer.The role focuses on driving customer growth through data engineering and tooling, requiring strong proficiency in Python and SQL.The ideal candidate should thrive in an unstructured and

The team is a backend team building internal and external APIs, enterprise distributed systems, services.

A tech company for urban mobility in London is seeking an experienced Engineering Manager to lead a Backend team responsible for core data infrastructure.

A dynamic tech company in the UK seeks a Mid-Senior Backend WordPress Developer for a fully remote role.

A forward-thinking tech company in Greater London seeks a Senior Software Engineer to own backend solutions development, lead a team, and enhance products for impactful software.

We are seeking an experienced Senior Software Engineer (Backend) to lead the development of our in‑house Charge Point Management System (CPMS) and customer‑facing app and web portal.

A Silicon Valley HealthTech company based in the UK seeks a Senior Python Backend Developer to design scalable backend services that manage real-time healthcare data.

This role combines hands-on backend development with end-to-end delivery leadership, requiring strong skills in JVM-based technologies and distributed systems. A leading software testing company in the United Kingdom is seeking a Lead Backend Software Engineer to own the technical delivery of produc

We're looking for a Lead Backend Engineer to help shape the future of Zego's platforms and services. As a Lead Engineer at Zego, you'll bring deep backend expertise driving delivery, influencing architecture, and mentoring others. Driving architectural discussions and decisions across multiple teams

The role requires 3+ years of experience in backend or full-stack development with languages like Node.

Want to work on the most pressing challenge of our generation? If you have experience building exceptional products, know how to execute at scale, and want to help build a company for the long term, we'd love to hear from you.CarbonChain helps the world’s biggest supply chains measure and reduce t

With hundreds of clients and over $500M in revenue processed, you’ll build mission-critical financial tools, architect core backend systems, and help shape both product and engineering culture at a pivotal moment of growth. Design, build, and optimise scalable backend services using Kotlin for com

The ideal candidate will have over 5 years of experience in building high-performance backend services, preferably using Kotlin.

Back-End developer (python and GCP) - £525 inside IR35.Experience with frontend technologies including React.Strong experience deploying and managing applications on Google Cloud Platform (GCP).Proficiency in designing and integrating RESTful APIs.Demonstrated ability to implement automated testing

A leading fintech company in Greater London is looking for experienced Kotlin engineers to enhance its product platform.As a key player, you will be responsible for developing high-quality services and collaborating on new features.The role emphasizes high-performance, scalable systems and a culture

A leading software provider in the UK is seeking a Software Engineer (Golang) to design and develop scalable backend systems.

A leading recruitment firm is seeking a Senior Backend Engineer for an innovative AI infrastructure company based in London.

NET Backend Developer to join a high-impact engineering team building one of the most demanding real-time sportsbook platforms on the market. If youe passionate about distributed systems, performance-driven backend engineering, and have experience working in sports betting or complex, event-based sy

A leading consultancy firm in Greater London is seeking an experienced Node Developer with Front End Development experience.You will join a collaborative team focusing on back-end development, API integration, and database management.The ideal candidate is expected to have a strong grasp of Node.Jav

A leading global financial services firm in Greater London is seeking a Software Engineer III to join its International Consumer Bank team.This position requires expertise in Java and cloud-native microservices, with responsibilities including creating secure, high-quality software and collaborating

A leading crypto company is seeking a seasoned software engineer proficient in Rust to design robust services and libraries, collaborating with cross-functional teams.This fully remote opportunity requires 7+ years of experience, a security-first mindset, and the ability to debug issues autonomously

An exciting opportunity at a technology-driven engagement platform for a Software Engineer III (Backend) in the UK. You will lead backend development efforts in a 0→1 environment, leveraging AI tools to enhance productivity and build scalable systems.

This is a generalist mid-level backend position within the Ads Organization.

Design and ship scalable, secure, and cloud-native backend features with a focus on simplicity, data consistency, and financial privacy. You have strong experience building scalable backends in Golang, making smart architectural trade-offs.

Staff Software Engineer to join our Customer Knowledge team in the UK or Ireland.This is a unique opportunity to architect and build large-scale, globally distributed applications that process hundreds of thousands of data points per second.In this role, you will be at the forefront of innovation, w

Observability, and Scale from Day One.Fluency with flexible databases like MongoDB and solid understanding of API architecture.REO:Digital is a leading customer experience agency in central London, specializing in digital experiences for global brands like Amazon, M&S, Tesco, and Samsung.We apply de

As a Senior Backend Developer, you will be part of the team that develops the backend components of all Bitfinex services (main trading application, Lightning Network support, Blockchain integrations, etc. Senior Backend Developer - Node. Scalability: ensure backend services remain smooth, responsiv

Professional backend development experience using Python. Understanding of backend security best practices.

We are looking for a Backend Infrastructure Engineer with strong experience in building and maintaining backend services that power developer infrastructure. Design, maintain, and evolve backend services supporting our CI infrastructure. Strong backend engineering experience with Java and Python.

A leading cryptocurrency platform in Greater London is seeking experienced backend engineers.

A leading technology firm in Greater London is seeking a Software Engineer to contribute to the development of AI-powered solutions.The role involves working with millions of documents daily, ensuring high standards for quality and performance while collaborating with cross-functional teams.The idea

We're looking for a strong Backend-focused Software Engineer who is excited to engineer highly performant, mission-critical systems that are designed for agile development and rapid scaling. You have experience with Python (preferred), or another modern backend technology, and are excited to work wi

Out of the successful launch of Chase in 2021, we’re a new team, with a new mission.We’re creating products that solve real world problems and put customers at the center - all in an environment that nurtures skills and helps you realize your potential.Our team is key to our success.We value col

Building Containerized Web Applications.Experience working with modern web frameworks (React.Background in designing and developing data-intensive web applications.Remote Work Opportunity in the UK.Uncovering problems, formulating hypotheses, and driving the entire process from concept to execution.

Senior Backend Engineer – AI transforming the future. Having just received their Series A funding, they’re hiring Senior Backend Engineers with Kotlin (or a combination of Java & Kotlin experience) to build new product features, improve performance and scalability, and help define technical dire

NLPatent is an industry leading AI-first patent research platform that was an early mover in the application of Large Language Models.We use a combination of proprietary and off-the-shelf machine learning models and NLP techniques to help our users answer patent related research questions such as "I

A leading tech innovator in Greater London is seeking a Director of Engineering to lead its backend data teams. The role involves setting technical direction, driving key initiatives, and mentoring backend engineers. Candidates should have over 10 years of experience in backend leadership, a strong

A tech recruiting firm is seeking a Senior Backend Engineer to lead backend services from design to production. The ideal candidate will have over 7 years of strong backend experience in Golang, solid skills in system design, API and data modeling, and familiarity with modern cloud architectures.

A leading property technology company in Greater London is seeking a Principal Engineer.In this senior role, you will shape the future of engineering in the consumer domain, leading scalable systems and driving architectural direction.You’ll require deep expertise in complex systems and strong lea