Full Stack Engineer

Full Stack Software Engineer London (Hybrid: Tue-Thu in office, WFH Monday & Friday) | Permanent | £70,000-80,000 Our client has built a comparison service for the UK wealth industry - it's live and working - and they're now expanding their tech stack considerably. They're hiring a mid-level developer to join the core build, working directly with the CTO. They're looking for someone with the fundamentals to build on their stack who is a fanatic user of AI coding tools. What you'll be doing You'll work directly with the CTO on the platform behind everything they do. Day to day, that means: Designing, building and shipping features end-to-end across the platform Expanding the stack: new services, new integrations, and LLM-powered features built into the product itself Using AI development tools as standard practice - and helping shape how the team gets the most from them Contributing to architecture decisions as the platform scales Writing clean, well-tested code and reviewing others' work with care Debugging, profiling and improving performance, reliability and security What we're looking for You'll need: The fundamentals to build on the client's tech stack - TypeScript, React/Next.js, Node, PostgreSQL and AWS Strong coding fundamentals - data structures, API design, testing, version control, and the judgement to know when to be rigorous and when to ship To be a fanatic user of AI coding tools: they're part of how you work every day, you follow the space closely, and you have opinions about what works Experience building with or integrating LLM APIs (Anthropic, OpenAI, etc.) - or personal projects that prove the interest is real The ability to thrive in a small team where you'll wear more than one hat Comfort being in the London office Tuesday to Thursday Nice to have: Experience in fintech, financial services or other regulated environments Familiarity with RAG pipelines, embeddings, prompt engineering or agentic frameworks Cloud platform experience (AWS/GCP/Azure), CI/CD, infrastructure-as-code Open-source contributions or a portfolio of side projects - especially AI-related Startup or scale-up experience What you'll get Direct mentorship from and daily collaboration with the CTO Real influence over technical direction - the platform is live, but the expansion is just beginning Budget for AI tools, hardware, and learning & development Hybrid working: Tuesday-Thursday in the London office, Monday and Friday from home 25 days holiday plus bank holidays Pension scheme Oscar Associates (UK) Limited is acting as an Employment Agency in relation to this vacancy. To understand more about what we do with your data please review our privacy policy in the privacy section of the Oscar website.

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