Software Engineer II - Frontend - Pro

Requirements

• 4+ years of experience in software development, with a focus on production web applications.
• Deep understanding of JavaScript/TypeScript and strong proficiency with the modern React ecosystem.
• Experience building real-time UIs with WebSockets and Web Workers.
• Strong React and JavaScript performance skills.
• Experience working with LLM coding tools (Cursor, Claude, Copilot or similar).
• Hands-on experience with React Query or similar.
• Practical experience with production user monitoring and observability.
• Experience with frontend testing at multiple levels.
• Comfortable with feature flagging and progressive rollouts.
• Familiarity with modern frontend build pipelines and tooling (rsbuild/webpack/SWC, monorepos, TypeScript project references, ESLint, Prettier, Husky).
• Strong understanding of UI/UX best practices and design-system driven development.
• Experience within a large technology organization or fast-growing startup.
• Strong written and verbal communication skills in English.

Nice to Haves

• Experience with feature flagging and progressive rollouts.
• Familiarity with modern frontend build pipelines and tooling (rsbuild/webpack/SWC, monorepos, TypeScript project references, ESLint, Prettier, Husky).
• Strong understanding of UI/UX best practices and design-system driven development.

What You'll Be Doing

• Leverage LLM's to accelerate development while still producing production-ready code.
• Leverage LLM's to build agentic flows to automate tasks and improve productivity.
• Design, develop and maintain features in a large, multi-product React web application used by professional traders globally.
• Own performance end to end: profile, measure and optimise real-time UI updates.
• Build and evolve the WebSocket and Web Worker layer that powers live market data.
• Set the standard for high-quality code through reviews, mentorship and constructive feedback.
• Contribute to technical strategy: architecture, data flow, state management.
• Safeguard performance improvements with regression-resistant patterns, instrumentation, dashboards and alerts.
• Own observability for the features you ship.
• Write integration and component tests.
• Drive process improvements and lead by example.

Perks and Benefits