Senior Frontend Developer

Frontend Software Engineer – React / TypeScript / Complex Web Applications

Location: London, UK (Hybrid)

Type: Full-time

Level: Mid to Senior

Salary: £70,000 to £140,000

About the Role

This startup is building a cutting-edge platform that redefines how engineers design physical products.

As a spin-out from one of the UK's most successful technology companies, the team includes world-class engineers and developers from top-tier product organisations. We're searching for a frontend engineer passionate about building complex, high-performance web applications.

Tech Stack (Engineering Environment)

Frontend: React, TypeScript, Vite, Zustand/Recoil, Tailwind (or similar), Web Workers, WebGL/WebGPU (nice to have)

Backend: Python, FastAPI, Pydantic, PostgreSQL

Infrastructure: GitHub Actions, GCP, Docker, Kubernetes

Paradigms: Event-driven architecture, functional programming, real-time data flows

Responsibilities

• Build and maintain complex, high-performance web applications using React and TypeScript
• Develop interactive UIs for geometry exploration, real-time simulations, and high-density data visualisation
• Work closely with engineers and domain experts to transform intricate physical and mathematical concepts into accessible UX flows
• Use functional and declarative programming patterns to create composable, reusable, testable UI components
• Architect and maintain client-side state management solutions that handle large, rapidly changing datasets
• Optimise performance using techniques such as memoisation, batching, Web Workers, and incremental rendering
• Own features end-to-end—from initial concept, prototype, and UX exploration through to production release
• Collaborate with backend teams to design efficient API shapes for event-driven and streaming data systems

Requirements

• Bachelor's degree in Computer Science, Engineering, Mathematics, Physics, or a related technical field
• 2+ years experience building complex, production-grade web applications
• Strong proficiency with React, TypeScript, and modern frontend tooling
• Experience working with Python

Frontend Software Engineer – React / TypeScript / Complex Web Applications