Software Engineer II – Frontend

Description

• Leverage LLM's to accelerate development while still producing production-ready code. • 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: meaningful Sentry instrumentation and actionable alerts. • Write integration and component tests. • Drive process improvements and lead by example.

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, TypeScript project references).

Benefits

• Health insurance • 401(k) matching • Flexible work hours • Paid time off • Remote work options

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