Caspian One
Senior Full Stack Developer (React‑Focused)
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Senior Full Stack Developer (React-Focused)
Location: London (Hybrid — in office Tuesday & Friday, ~50% on-site)
Contract: 6-month initial (likely 12–18 +)
Rate: Up to £825/day
Overview
We’re looking for a React-strong Full Stack Engineer to join a front-office applications team. The role is frontend-heavy and focuses on refactoring and improving high-performance UIs used across trading, regulatory, and operations workflows. You’ll work closely with product, engineering, and business teams to deliver fast, scalable, well-tested interfaces.
Key Responsibilities
- Lead React UI development — refactor complex front-end codebases and deliver high-quality, performant interfaces.
- Build reusable components and scalable client-side architecture.
- Collaborate with Java back-end teams on API design and data flows.
- Optimise performance for large datasets (search, filtering, paging).
- Write strong tests — unit, integration, CI pipelines.
- Contribute to design discussions, code reviews, and mentoring.
- Work with product, BA, and QA teams to turn requirements into polished user experiences.
- Participate in on-site technical interviews as needed.
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Must-Have Skills
- Expert React engineering — hooks, functional components, performance tuning.
- Strong front-end architecture and clean-code mindset.
- Working knowledge of Java and integrating React with Java-based services.
- Experience building UIs that handle large datasets with high responsiveness.
- Familiarity with modern tooling: Webpack/Vite, Babel, ESLint, Jest, React Testing Library.
- Solid understanding of state management (Redux, Context, etc.).
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Nice-to-Have
- Experience in financial services / trading / regulatory environments.
- Strong TypeScript skills (preferred).
- Experience with real-time or search-heavy UI performance engineering.
- Computer Science degree.
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