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Haystack
Senior Full Stack Engineer
£100k
- £120k
London
Hybrid
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Description
Hybrid requirements: 3 days per week in the office.
Senior Full Stack Engineer (2x Roles — Frontend-Focused & Backend-Focused)
Location: London (Hybrid – 3 days/week in office)
Type: Full-time
We’re hiring two exceptional Senior Software Engineers to help shape the future of our client’s platform. Both roles are full stack, but one has a stronger emphasis on frontend development, while the other leans more heavily on backend systems.
You’ll play a key role in building intuitive, scalable, and high-performing features across our product. Whether your strength is in crafting elegant UI experiences or architecting robust backend systems, we’re looking for engineers who thrive in cross-functional teams and love owning features end-to-end.
What You’ll Do
Deliver impactful features across the stack, with a focus aligned to your expertise (frontend or backend).
Own systems from architecture and implementation to deployment and ongoing improvement.
Collaborate closely with design, product, and customer teams to translate ideas into polished user experiences.
Contribute to the evolution of our technical direction, engineering practices, and product strategy.
Participate in the full development lifecycle: planning, coding, reviewing, launching, and iterating.
What We’re Looking For
5+ years’ experience building and shipping full stack applications.
For the frontend-focused role: Deep experience with React and TypeScript, strong UI/UX sensibilities, and a portfolio that showcases your frontend work.
For the backend-focused role: Strong experience building scalable APIs and backend systems, ideally using Python (or a willingness to learn it).
Solid understanding of cloud infrastructure (AWS, GCP, or Azure).
Comfortable working in fast-paced, collaborative environments.
Bonus: Experience in a high-growth startup, familiarity with testing tools (e.g., Playwright, Storybook), and serverless architecture.
Tech Stack
Frontend: React, TypeScript, Playwright, Storybook
Backend: Python, FastAPI, Postgres, TypeScript
Cloud: AWS (Lambda, DynamoDB, EKS, etc.)
DevOps & Tooling: GitHub Actions, Terraform, Docker
Role tech stack
Python
React
TypeScript
AWS
Haystack
Senior Full Stack Engineer
£100k - £120k
London
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