Senior Software Engineer (Full-stack)

Direct message the job poster from Primis

Senior Software Engineer (Full-stack) – Permanent | On-Site | London

Join a rapidly scaling US-backed startup at a pivotal moment. With significant funding secured and strong momentum, they are establishing their UK presence and offering exceptional equity opportunities for early team members.

As a Senior Software Engineer, you\’ll work across our Python and TypeScript stack, contributing wherever the team needs you most.

What You\’ll Be Doing:

• Develop and maintain FastAPI (Python) and Next.js (TypeScript) applications.
• Own features end-to-end – from user interface through to infrastructure and internal tooling.
• Navigate and contribute to diverse codebases across the platform.
• Shape product direction and architectural decisions.
• Work alongside engineers and AI specialists in a cross-functional environment.
• Grow your expertise while sharing knowledge with the team.

What We\’re Looking For:

• Growth mindset – You\’re intentional about self-improvement and continuous learning
• Deep expertise – You\’ve mastered something technical; the specific domain matters less than the depth of skill
• Comfort with ambiguity – You thrive on open-ended challenges and unstructured problems
• Code fluency – You can dive into complex systems and make impactful contributions quickly
• Technical foundation – Strong skills in Python, TypeScript, or both (or genuine enthusiasm to learn)
• Collaboration style – You work well with others but are equally effective independently

Nice to Have:

• Experience with modern frontend frameworks (React, etc)
• Background in API development or distributed systems

For more information, please apply!

*Please note that this role will not be able to provide sponsorship support.

Research shows that candidates from underrepresented groups often wait until they meet nearly all requirements before applying, while others apply when meeting just 50‑60%. If this role excites you and you meet many—but not all—of these criteria, we still want to hear from you.

We actively encourage applications from underrepresented talent and are committed to supporting accessibility needs throughout our hiring process.