Software Engineer II – Frontend

Kraken Digital Asset Exchange

Software Engineer II responsible for building and maintaining a real-time React application for Kraken traders. Focused on performance, stability, and quality code in a remote team environment.

Posted 5/28/2026full-timeRemote • 🇧🇷 BrazilMid-LevelSeniorWebsite

Tech Stack

Tools & technologies

JavaScriptReactTypeScriptWebpack

About the role

Key responsibilities & impact

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, component design and shared libraries.
Safeguard performance improvements with regression-resistant patterns, instrumentation, dashboards and alerts.
Own observability for the features you ship: meaningful Sentry instrumentation, Mixpanel events, structured logs and actionable alerts.
Write integration and component tests.
Drive process improvements (engineering practices, tooling, build pipeline, AI-assisted workflows).

Requirements

What you’ll need

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.
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.

Benefits

Comp & perks

Kraken is a mission-focused company rooted in crypto values.
Industry-leading security, crypto education, and world-class client support.

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

JavaScriptTypeScriptReactWebSocketsWeb WorkersReact QueryUI performance optimizationintegration testingcomponent testingobservability

Soft Skills

mentorshipconstructive feedbackprocess improvementcommunication