Full-stack Engineer (AI Focused) – London
A fast-growing AI-native enterprise software startup is hiring two experienced Full-stack Engineers in London. The company builds a sophisticated AI workspace tailored to financial modelling, private equity, consultancies and asset managers, with live production deployments at leading institutions.
What you’ll be doing
* Designing and maintaining modern frontend web apps using React / Next.js
* Developing robust backend services and APIs, preferably in Python (Django, FastAPI, etc.)
* Owning large parts of the AI agent infrastructure: building and deploying multi-agent systems, Retrieval-Augmented Generation (RAG) pipelines, model fine-tuning and evaluation frameworks
* Ensuring that AI-powered features run in production at scale — with high reliability, performance and security
* Contributing to cloud infrastructure, containerisation, CI/CD pipelines, monitoring, and optimisation
* Collaborating closely with founders, designers, growth and engineering teams to deliver mission-critical, high-impact features
* Mentoring junior engineers and promoting engineering best practices
What they’re looking for
* 5+ years of professional software engineering experience
* Solid, hands-on experience with React / Next.js in production environments
* Strong backend development skills (Python preferred) and familiarity with databases (relational or NoSQL)
* Experience with Git, DevOps tooling, containerisation, CI/CD, caching or messaging systems (Redis, task queues, background workers)
* Previous experience building and deploying AI/LLM-powered systems, especially involving RAG pipelines, model fine-tuning and evaluation
* A structured, proactive approach to problem solving, and comfort working in a fast-paced, high-ambition startup environment
Why it’s a great opportunity
* Join a tech venture backed by top-tier investors (including Y Combinator), and work directly with founders who have a track record of successful exits
* Competitive salary, equity and performance-based incentives
* Be a key player in scaling the product internationally, with opportunities for real ownership and impact
* Work in a challenging but rewarding environment, alongside smart, tenacious people who thrive in ambiguity
If you’re passionate about building real-world AI systems end-to-end — from models to product — and want to be at the forefront of applying AI in enterprise workflows, this could be your next big move.