Senior Full-Stack Engineer - Global Fintech (Joining new AI Innovation Team) - £100k + bonus - TypeScript/ Python + Building AI Agents

Skills

Job Specifications

I am recruiting for a Senior Full-Stack Engineer (with some AI experience) for a NEW AI Innovation Team for a leading global fintech.

This brand new team (embedded within a major global fintech powerhouse) will be building a brand new AI Platform (AI‑driven compliance technology for a platform used across nearly 30 markets)

Within this team you will be shaping the next generation of intelligent systems that transform how financial crime is detected, investigated, and prevented worldwide.

This is a chance to:

Join a greenfield team and work on a very exciting & innovative project (from the off!)
Build production-grade AI agents used in live financial workflows
Work like a startup, backed by the resources of a global fintech
Shape a platform with massive scale and real impact within weeks

What You’ll Do

Own full-stack features end-to-end, from React frontends to FastAPI backends to LLM integrations - This is a FULL-STACK role in every sense of the word.

Architect AI agent workflows: LangGraph, multi-agent orchestration, RAG pipelines
Drive technical initiatives and bring clarity to ambiguous, high-impact problems
Integrate diverse systems: internal APIs, third-party data (e.g., LexisNexis), warehouses, and external intelligence sources
Push platform reliability to the next level with monitoring, alerting, and performance tuning
Mentor engineers and champion best practices across design, architecture, and testing
Collaborate seamlessly with Product, Design, Compliance, and partner engineering teams

You’ll be one of the senior technical voices steering the platform’s direction + will have lots of autonomy/ trust/ freedom to really innovate and bring your ideas to life...

You need:

5+ years engineering experience
Deep React + TypeScript knowledge
Strong Python backend skills (Fast API)
Excellent system design instincts
API design across REST + WebSockets/SSE
Solid SQL + NoSQL experience
Testing discipline and ownership mindset
Clear, proactive communication
Experience mentoring teammates
LLM/AI background (LangChain, LangGraph, RAG, prompt engineering)
Experience shipping production AI systems
AWS expertise
Streaming/event-driven architectures
Fintech or compliance exposure
Micro-frontend architectures
Terraform/CDK

This is 4 days a week in their Central London office

Paying up to £100,000 + Bonus

About the Company

La Fosse is on a mission to help our customers achieve their ambitions, working by their side to create a total talent solution from the classroom to the boardroom. Our vision is simple: to lead by example to achieve a change in the standards of care within our industry. We partner with our customers to build solutions for their business and people challenges, leveraging our recruitment, academy, solutions, and executive search offerings. Our expert teams work at all levels on a permanent, contract, interim, and executive ... Know more

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