Lead Software Engineer

Founding Engineer / Lead Software Engineer / Senior Software Engineer

London (Hybrid)

Full-time

Salary - £80,000 - £120,000 + Equity

We’re looking for a Founding Engineer to help build the foundations of a new product tackling complex infrastructure and AI behaviour challenges.

This is an early opportunity to take real ownership in a small, fast-moving team working on hard technical problems with meaningful impact.

You’ll be working across backend engineering, system design, and building production-ready infrastructure from scratch.

If you enjoy autonomy, moving quickly, and shaping both product and engineering direction, you’ll fit right in.

What you’ll work on

• Designing and building backend systems using Python and frameworks like FastAPI , or similar.
• Creating reliable, scalable architecture for real-time decisioning systems.
• Implementing caching, queuing, load balancing, and distributed processing.
• Shipping high-quality code quickly in an environment where done is better than perfect.
• Building internal tools, APIs, and core services that support the entire product.
• Working closely with the founding group to define engineering culture, processes, and standards.

What we’re looking for

• Strong backend engineering experience Python .
• Experience with FastAPI , Django , Flask , or related frameworks .
• Confidence designing system architecture from scratch and making pragmatic trade-offs.
• Comfort working in ambiguous, high-autonomy environments.
• A bias toward shipping and iterating rather than over-engineering.
• Interest in challenges involving AI behaviour , infrastructure , or regulated environments .
• Someone who enjoys taking ownership and shaping direction, not just following tickets.

Nice to have

• Experience in fintech , health tech , defence , or other regulated spaces .
• Exposure to AI/ML systems .
• Open-source contributions or independent projects.
• Experience building real-time or safety-critical systems.

What you’ll get

• The autonomy and influence that comes with being part of an early engineering team.
• The chance to work on real, unsolved problems with serious technical depth.
• A meaningful equity package.
• A collaborative environment focused on learning, ownership, and speed.