Senior Full Stack Engineer

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Haystack

Senior Full Stack Engineer

£100k

-

£120k

London

Hybrid

Graduate
Junior
Mid
Senior
Leader

Description

Hybrid requirements: 3 days per week in the office.
Haystack is working with a direct employer on this opportunity.
Senior Full Stack Engineer (Frontend-focused)
Location: London (Hybrid – 3 days/week in office)
Type: Full-time
We’re hiring an exceptional Senior Software Engineer to help shape the future of our client’s platform.
The client’s brief:
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.
Deep experience with React and TypeScript, strong UI/UX sensibilities, and a portfolio that showcases your frontend work.
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

react
React
typescript
TypeScript
aws
AWS
python
Python

Culture overview

At Haystack we work like the product we build – fast, transparent and signal-driven. We trust people to own their work and give them the space to ship without red tape. Ideas win on merit, not job titles. We’re remote-friendly but tightly connected, using daily async stand-ups and quick calls when it matters. Feedback flows openly, experiments happen daily, and learning is built into the job. Everyone here cares about craft – whether that’s clean code, crisp design or clear communication – and we back each other to keep raising the bar. We celebrate wins, own mistakes and move on quickly. If you like autonomy, impact and a team that genuinely roots for each other, you’ll feel at home at Haystack.

Employee benefits

Flexible Hours
Flexible Working
Free Parking
Laptop
Learning Allowance
Learning/Development days

Office vibe

Beer Fridge
City Centre
Free Coffee
Social Events
Team Building Days

Location

Leadership

Mike Davies
Co-founder

Tech overview

Haystack is a real-time marketplace connecting 150k+ tech professionals with teams they actually want to join. Our AI-driven matching crunches millions of data points to surface the right people in seconds, while Verified Candidates come pre-screened and interview-ready with 80% shortlist rates. Behind the scenes we run a live, event-driven platform built with TypeScript/Node, React, GraphQL, MongoDB and AWS—shipping fast with vector search, embeddings and microservices powering instant alerts and 24–48h interview booking. If you love distributed systems, data pipelines and building products people genuinely want to use, this is the place to do it.

Engineering principles

Agile Process
Code Reviews
Continuous delivery
Continuous Development
Mentoring
Rapid release cycles
Scrum
Unit testing

Company tech stack

aws
AWS
graphql
GraphQL
mongodb
MongoDB
nodejs
Node.js
react
React
react-native
React Native
typescript
TypeScript
Haystack
Senior Full Stack Engineer
£100k - £120k
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