Founding Engineer

Senior Engineer (£90k-£120k) - Greenfield Platform Build

This is a senior, high-trust engineering role for someone who wants to build core systems properly, not inherit legacy or operate inside rigid delivery structures.

You'll be joining a small, engineering-led team at an early stage, working on a greenfield platform with long-term technical ambition. The focus is on building reliable, scalable software that will sit at the heart of a complex product.

This is not consultancy work and not feature factory delivery.
You'll have genuine ownership over how systems are designed, built, and evolved.

What you'll be doing

• Designing and building core backend services and APIs

• Contributing to architectural decisions that underpin future scale

• Working across the full lifecycle, from problem definition to production

• Building systems that prioritise reliability, performance, and maintainability

• Collaborating closely with a small, senior team where quality matters

What they're looking for

• Strong experience as a backend or backend-leaning full-stack engineer

• Comfortable operating in early-stage, ambiguous environments

• Experience building production systems that need to be robust and dependable

• Pragmatic engineering mindset - knows when to move fast and when to slow down

• Enjoys ownership, responsibility, and technical depth

Context

• Early-stage, product-led business

• Small, senior engineering team

• High autonomy, low bureaucracy

• Engineering decisions genuinely matter

• London fully onsite
• Uop to £120k + equity