Software Engineer
Three Sigma
Location
London
Employment Type
Full time
Location Type
Hybrid
Department
Engineering
Deadline to Apply
October 16, 2025 at 7:00 PM EDT
Compensation
- Software EngineerSalary £45K – £55K • 0.25% – 0.5%
Location: London (Hybrid, 4 days/week in office) • Team: Early engineering • As: Full-stack engineer
Why this role
Ship useful software fast. You’ll design, build, and own features end-to-end in a small team working directly with the founders. You’ll build and ship features that matter, take real ownership of your work, and grow quickly as part of a high-velocity team.
What You’ll Do
Design, build, and ship user-facing features across the stack.
Develop and maintain REST APIs and backend services with scalable, maintainable designs.
Implement secure data flows and integrations.
Build complex workflow tools and interactive UIs (think editors, tables, real-time updates).
Keep quality high through tests, reviews, and clear, simple code.
Work directly with founders and product from concept to release + iteration.
What We’re Looking For
Startup mindset: bias for action, ability to work independently, comfort with ambiguity.
Strong fundamentals: solid grounding in computer science (data structures, algorithms, systems).
Full-stack skills: React/TypeScript or similar on the frontend, Python/Django (or another MVC framework) on the backend.
Track Record: ~2+ years professional experience or open-source/projects that show you can build and ship.
Collaboration: strong communication, team-first attitude.
Nice to Have
Experience with Next.js or modern server-side frameworks.
Familiarity with component libraries/design systems.
Curiosity for DevOps, CI/CD, or infra as code.
Why Join Us
Ownership: we expect every engineer to think beyond code, shaping product and architecture.
Learning & Growth: work directly with founders in a fast-paced environment.
Startup energy: small team, ambitious mission, rapid iteration, big upside.
Compensation Range: £45K - £55K