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Senior Machine Learning Engineer Salary: £70,000–£90,000 Location: London (Hybrid) The Opportunity We’re looking for a Senior Machine Learning Engineer to help design, build, and deliver next-generation AI systems. You will work across LLMs, retrieval-augmented generation (RAG), and modern agent frameworks to transform large, unstructured data into meaningful insights and production-ready capabilities. This is a hands-on role within a growing AI team, offering the chance to shape architecture, build scalable pipelines, and ship features that directly impact users. Responsibilities • Develop, integrate, and fine-tune LLMs for natural-language understanding, reasoning, and workflow automation., • Build agentic/LLM-driven workflows for multi-step decision making across diverse data sources., • Architect and deliver ML features such as pattern recognition, entity extraction, and intelligent automation., • Design scalable data and streaming pipelines capable of handling large, heterogeneous datasets., • Build and optimize vector search, embeddings, and RAG systems to support high-quality retrieval., • Deliver production-ready APIs, services, and model inference systems., • Manage deployment, monitoring, observability, and continual improvement of ML models., • Evaluate model performance using offline metrics, A/B tests, latency and cost optimisation., • Work closely with product and domain experts to translate requirements into robust ML solutions. Who You Are • Strong proficiency in Python and experience with PyTorch or TensorFlow., • Practical experience with LangChain, LangGraph, AutoGen, or similar LLM/agent frameworks., • Skilled in prompt engineering, integrating foundation model APIs, and LLM fine-tuning techniques., • Expertise in building RAG systems, vector databases (e.g., Pinecone, Weaviate), and embedding pipelines., • Experience with ML/LLMOps for monitoring, evaluation, and traceability., • Solid understanding of distributed systems, microservices, and real-time data processing., • Comfortable with containerisation and cloud infrastructure (Docker, AWS, Terraform, etc.)., • Experience deploying production AI systems with a strong focus on reliability and safety., • Background in NLP, information extraction, or large-scale unstructured data processing., • Experience in security, intelligence, or data-heavy platforms is a plus but not required. Education & Experience • Degree in Computer Science, AI/ML, or equivalent practical experience., • Demonstrated experience building and shipping ML/AI products at scale., • Proven track record working with LLMs, RAG pipelines, or agent-based systems. Work Environment • Hybrid: mix of remote work and in-person collaboration in our London office., • Flexible schedule within standard business hours.

CHARLIE OSCAR Where digital growth meets bold ideas, brilliant minds and a seriously good time. READY TO DO WORK YOU'RE PROUD OF? At Charlie Oscar, we’re not your typical digital marketing agency - we’re a team of big thinkers, bold doers, and collaborative problem-solvers. We partner with some of the world’s most ambitious brands to help them outsmart, outpace, and outgrow the competition. How do we do it? By blending data science and creativity to make smarter decisions and create work that actually makes an impact. The numbers give us clarity, but it’s our creativity that wins hearts, builds brands, and drives real growth. Life at Charlie Oscar is fast-paced, exciting, and full of opportunities to learn, grow, and push boundaries. You’ll be working alongside some of the sharpest minds in the industry, solving big challenges, delivering work you’re proud of, and seeing the difference you make for global brands. And we know it’s not all about work. We make time for fun too - whether it’s weekly run club, book and chess clubs, charity fundraisers, Thursday drinks, or epic team socials, there’s always something to get involved in and people to connect with. Most importantly, we hire for attitude and culture add, not just experience. We want curious, ambitious people who aren’t afraid to challenge the status quo, bring fresh ideas to the table, and help us shape the future of marketing. Sound like your kind of place? WHO WE HIRE We look for attitude first. If you're smart, humble, proactive, and genuinely curious – you’ll fit right in. We want people who care deeply about their craft, but don’t take themselves too seriously. We’re building a culture where brave ideas are encouraged, learning is constant, and everyone’s voice matters. If you’re already playing with AI to do smarter work, even better. We don’t expect you to be a specialist – just inquisitive and excited to find tools to elevate what we do. ABOUT THE ROLE As a Growth Director, you’ll play a pivotal role in driving revenue growth, expanding our client portfolio, and positioning Charlie Oscar as the go-to agency for brand and performance marketing. You’ll be responsible for developing and executing a structured new business strategy, leveraging outbound tactics, CRM automation, and industry networking to create meaningful opportunities. WHAT YOU’LL BE GETTING STUCK INTO (aka Responsibilities) Lead Generation & Pipeline Growth • Own and execute an outbound lead generation strategy targeting our Ideal Customer Profile (ICP), • Identify and engage Marketing and Growth leaders at high potential brands through multi channel outreach, • Drive both Marketing Qualified Leads (MQLs) and Sales Qualified Leads (SQLs) into the new business pipeline, • Track, analyse, and optimise lead conversion performance across key channels Email Prospecting & Lead Nurturing • Manage and optimise our HubSpot CRM, ensuring clean data and effective segmentation, • Design and execute audience specific campaigns across content themes, nurturing leads through structured journeys, • Collaborate with marketing to develop content driven outreach strategies Industry Events & Networking • Represent Charlie Oscar at industry events, forging relationships with key decision makers, • Develop strategic event outreach plans to maximise networking and lead generation opportunities, • Identify sponsorship and speaking opportunities to enhance agency visibility New Business & Pitch Support • Support the CGO on proposal writing, ensuring clear, compelling, and commercially sound responses, • Support the senior leadership team in agency pitches, crafting persuasive presentations and storytelling narratives, • Collaborate with internal teams to identify prospect opportunities and tailor solutions to prospective client challenges WHAT WE’RE LOOKING FOR • Proven experience in B2B sales, growth, or new business development within a marketing agency, consultancy, or high growth business, • A strategic thinker who can balance data-driven decision making with creative problem solving, • Hands-on experience with HubSpot CRM, audience segmentation, and lead nurturing workflows, • Strong networking skills with the ability to build relationships at senior levels, • Excellent written and verbal communication skills, particularly in outreach and proposal writing, • A proactive, self-starter attitude - comfortable working independently while collaborating across teams BENEFITS • Competitive salary plus quarterly bonus up to 10% of your quarterly salary, • Wellness allowance including access to Bupa private health care, • Pension plan, • Regular team socials and annual company trip, • Hybrid working (3-days pw in our London Bridge office), • 25 days’ holiday per year, plus bank holidays and time off over Christmas, • 4 weeks ‘Work From Anywhere’ per year, • Birthday off, • Cycle to Work Scheme with Forest Bikes, • Eye care vouchers, • Regular office treats and surprises, • Be part of building something truly exceptional WHAT MAKES US US - OUR VALUES At Charlie Oscar, our values aren’t just posters on the wall – they show up in how we work, how we treat each other, and how we build something brilliant together. Make It Happen Momentum matters, progress beats perfection every time. Treat It Like Your Own Think like an owner. Care for every detail as if it were your money, your brand, your business. Grow Together Build the business, lift your team, and invest in your own growth along the way. Be Brave We create space for bold thinking, confident decisions, and the freedom to back yourself.

Marketing Automation & AI Engineer (Remote). Make, Airtable, APIs, ChatGPT automation. Build AI-driven agents, automations, and internal tools that improve traffic, conversions, and lead flow.

Oscar Associates (UK) Limited is acting as an Employment Business in relation to this vacancy.

Location - Remote / London / Vilnius.We're looking for a system-minded Technical Writer to join a modular banking platform used by FinTech teams to take ownership of their product documentation and turn it into a clear, reliable source of truth.Your mission is to make sure that every part of the pla

We're looking for a Senior Machine Learning Engineer to help design, build, and deliver next-generation AI systems. You will work across LLMs, retrieval-augmented generation (RAG), and modern agent frameworks to transform large, unstructured data into meaningful insights and production-ready capabil

Oscar Associates (UK) Limited is acting as an Employment Agency in relation to this vacancy.

Head of Engineering - Fully Remote - £100,000-£150,000.I'm currently partnered with one of the biggest names in their industry - a genuinely market-leading organisation with world-renowned clients - and they are looking for an exceptional Head of Engineering to join them during a hugely exciting p

As a Customer Success Manager, you'll be the bridge between clients and internal technical teams, ensuring seamless integration, onboarding, and long-term satisfaction. You'll manage integration support cases, monitor performance, and proactively resolve challenges to keep clients engaged and succes

Chief Revenue Officer Cyber Security. Following sustained momentum and increasing demand from senior stakeholders, the business is now seeking a Chief Revenue Officer to lead revenue strategy, scale the commercial function and drive enterprise growth.

Following sustained momentum and increasing demand from senior stakeholders, the business is now seeking a Chief Revenue Officer to lead revenue strategy, scale the commercial function and drive enterprise growth. This is a board level appointment with ownership of go to market strategy, revenue per

Help Desk Technician | £150 - £160 p/day | Stockport (5 days onsite) | Contract (3+ months) | January Start Our client is looking for a help desk technician with 2+ years of experience to join their team based in Stockport. Location : Stockport (5 days onsite) Contract : Until April (could extend)

Responsibilities in this role include: Manage full sales cycle from initial outreach to close Prospecting and generating your own leads Engaging and building rapport with decision makers Work closely with colleagues across sales and marketing, ensuring a consistent approach to outreach and messaging

Key experience: Enterprise-scale storage architecture and design High-performance or clustered compute environments Supporting data-intensive workloads and modern analytics platforms Details will be shared selectively due to confidentiality If you're an experienced Storage Architect, apply now and I

Stay at the forefront of SEO and digital innovation, leading knowledge-sharing sessions and ensuring the team remains ahead of industry change About You: Skills & Attributes: Deep, hands-on expertise across all core SEO disciplines, including technical SEO, on-page optimisation, and link acquisition

Role: DevSecOps Engineer Location: Manchester (Hybrid with just 1 on-site day per month) Salary: £70,000 - £80,000.Oscar Technology have partnered with a fast-growing technology firm on a mission to make digital investing simpler, smarter, and more secure.Backed by a leading UK investment group, t

Job Title: SEO Account Director Location: Manchester Work Pattern - Hybrid - 3 days a week in the office Type: Permanent, full-time Salary: £42,000 plus benefits Oscar Associates (UK) Limited is acting as an Employment Agency in relation to this vacancy. To understand more about what we do with you

Job Title: Paid Search Account Manager Location: Manchester Work Pattern - Hybrid Type: Permanent, full-time Salary: £45,000 plus benefits About the Role: As Search Account Director, you will lead the end-to-end planning, strategic direction, and performance optimisation of paid search across your

Software Developer - York - Hybrid - Salary £30k-£40k (DOE) Our client, a well-established brand in the hospitality and travel industry, is seeking a talented Software Developer to join their collaborative in-house development team. Develop and maintain web applications in line with project requir

Job Title: Paid Search Account Director Location: Manchester Work Pattern - Hybrid Type: Permanent, full-time Salary: £42,000 plus benefits About the Role: As Search Account Director, you will lead the end-to-end planning, strategic direction, and performance optimisation of paid search across your

About the Company We’re recruiting an Infrastructure Engineer to support and develop a hybrid on-prem and cloud environment for a Leicester-based organisation. This role offers broad exposure across traditional on-prem infrastructure and modern cloud platforms, with a strong focus on Azure and VMware. About the Role You’ll be responsible for maintaining stability across the on-prem estate while helping evolve the organisation’s cloud environment in line with best practice. Working alongside infrastructure and service teams, you’ll handle day-to-day support, escalations and improvements across both on-prem and cloud systems, as well as contributing to upgrades and technical change. Responsibilities • Supporting on-prem infrastructure including Windows Server, Active Directory, DNS, DHCP and Group Policy, • Administering VMware hosts and virtual machines within the on-prem environment, • Managing patching, firmware upgrades and lifecycle activities across on-prem servers, • Supporting enterprise storage and backup platforms, including recovery testing, • Maintaining and developing Azure infrastructure across virtual machines, storage and networking, • Supporting hybrid connectivity between on-prem systems and Azure cloud services, • Acting as an escalation point for incidents impacting both on-prem and cloud platforms, • Producing documentation and contributing to service and platform improvements Qualifications • Experience in an infrastructure or systems engineering role, • Strong background supporting on-prem Microsoft infrastructure, • Hands-on experience with VMware in a production environment, • Practical experience supporting or administering Azure cloud infrastructure, • Comfortable working across hybrid on-prem and cloud environments, • Strong troubleshooting and documentation skills Required Skills • PowerShell scripting for automation, • Experience with Veeam, Rubrik or similar backup platforms, • Exposure to DR testing or failover exercises, • Microsoft Azure or VMware certifications Preferred Skills • None specified Pay range and compensation package Up to £45,000 salary Equal Opportunity Statement We are committed to diversity and inclusivity.

EC2, S3, RDS, Lambda, Bedrock, Secrets Manager, CloudFront.

A leading technology firm is seeking a Head of Engineering to drive the technical direction and build a robust engineering team.This fully remote position in the UK offers a competitive salary of £100,000-£150,000, engaging senior talent in both leadership and hands-on coding.Collaborate directly

Responsibilities in this role include: Manage full sales cycle from initial outreach to close Prospecting and generating your own leads Engaging and building rapport with decision makers Work closely with colleagues across sales and marketing, ensuring a consistent approach to outreach and messaging

A leading fintech company in East Midlands is seeking a Chief Technology Officer to drive technology advancement and strategic direction.The CTO will have full ownership of the technology function, influencing the broader business strategy.This individual will define the long-term technology roadmap

Key experience: Enterprise-scale storage architecture and design High-performance or clustered compute environments Supporting data-intensive workloads and modern analytics platforms Details will be shared selectively due to confidentiality If you're an experienced Storage Architect, apply now and I

Benefits Hybrid - Leicestershire (2+ days per month onsite) Fintech | Full Strategic Autonomy.I'm partnering with a high-growth fintech that has established itself as the market leader in its niche, backed by strong investment and operating within a regulated environment.They're now seeking an outst

Head of Engineering - Fully Remote - £100,000-£150,000.I'm currently partnered with one of the biggest names in their industry - a genuinely market-leading organisation with world-renowned clients - and they are looking for an exceptional Head of Engineering to join them during a hugely exciting p

OTE £200,000 Oscar Sales are partnering with a high growth cyber security and risk intelligence business operating within the UK enterprise market. Package and Benefits: Uncapped performance bonus Board level influence and visibility Hybrid working from London Opportunity to shape and build the com

Oscar Associates (UK) Limited is acting as an Employment Agency in relation to this vacancy.

A market-leading organization is seeking a Head of Engineering to oversee their technical direction while maintaining a hands-on role in coding.This fully remote position offers a competitive salary of £100,000-£150,000 and a chance to manage a team of 10 engineers.Candidates should have strong le