Software Engineer II - Frontend
New
K
KrakenCryptocurrency
Location: Brazil; Secondary Locations: Chile, South Africa, Colombia, Czech Republic, Sweden, Cyprus, Poland, Hungary, Lithuania, Mexico, Argentina, Peru, Bulgaria, Romania, Costa Rica, Slovenia, SlovakiaFull-TimeMiddle
Salary not disclosed
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Job Details
- Languages
- English
- Experience
- 4+ years
- Required Skills
- TypeScriptReact
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.
- Strong understanding of UI/UX best practices and design-system driven development.
- Strong written and verbal communication skills in English.
Responsibilities
- 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 so the app stays responsive under heavy WebSocket throughput.
- Build and evolve the WebSocket and Web Worker layer that powers live market data, balances, positions and order updates.
- Leverage LLM's to accelerate development and build agentic flows to automate tasks.
- Contribute to technical strategy including architecture, state management, and shared libraries.
- Own observability for features through Sentry instrumentation, Mixpanel events, and structured logs.
- Write integration and component tests.
- Set the standard for high-quality code through reviews and mentorship.
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