Full Stack Engineer

Senior Full Stack Engineer | London | Agentic AI | £120,000 - £160,000 + equity

Tech stack: Python (FastAPI) & React

This is not one of those “AI startup” roles where the reality doesn’t match the pitch.

We’re partnered with a fast-paced company building an agentic AI product, focused on systems that can actually take action, make decisions, and operate reliably in real-world environments. The emphasis is on the platform and infrastructure layer, not model tinkering or surface-level features.

This is an exceptionally high calibre team, experienced leadership, and serious investors backing them. The bar is high, the expectations are real, and the opportunity to do meaningful work early is very much there.

The Role

You’ll operate as a true full stack engineer, with ownership across backend systems and frontend architecture, helping shape both how the product is built and how it evolves.

• Design and build well-structured, strongly typed backend systems in Python
• Develop scalable, maintainable frontend architecture using React and TypeScript
• Own data models, schemas, and system design end to end
• Integrate complex external systems into a cohesive platform
• Take ideas from concept through to production without layers of process
• Influence architectural decisions that directly impact the product

What You’ll Be Doing

• Building production-grade systems around agentic AI workflows and orchestration
• Working across the stack, balancing speed with long-term quality
• Designing APIs and services that are robust, observable, and scalable
• Collaborating closely with users to ensure the product solves real problems
• Contributing to a high-performance engineering culture with strong technical standards

What They’re Looking For

• Strong full stack experience with Python and modern frontend frameworks
• Clear focus on clean design, readability, and long-term maintainability
• Experience building and scaling systems, not just delivering features
• Comfort working in ambiguity and taking ownership of complex problems
• Product mindset, you care about why something is being built, not only how

This is for someone who leans into difficult problems rather than avoiding them, and who wants to be surrounded by people who will challenge their thinking and raise their standard.

If you’re interested in AI but more drawn to building the systems that make it usable in the real world, this is exactly that space. High ownership, strong equity, and a team that will get the best out of you!

If that sounds like your kind of environment, drop me a message at [email protected].