Staff Frontend Engineer

Join our team as a Staff Frontend Engineer, where you'll take ownership of the frontend architecture for our data-dense applications. This hands-on role requires deep expertise in React and TypeScript, and you'll be responsible for leading the development of performant, accessible UIs, setting frontend standards, and mentoring engineers. Enjoy a range of benefits, including medical, dental, and vision insurance, a 401K match, paid vacation and sick days, and more.

• Responsable de l'architecture des applications React/TypeScript et des modèles de développement.
• Diriger le développement d'interfaces utilisateur performantes et accessibles pour des flux de travail de recherche et d'analyse complexes.
• Mentorer les ingénieurs et diriger des initiatives techniques à l'échelle du département, de la proposition à l'adoption.

• Ability to mentor, review code with judgment, and raise the bar without becoming a bottleneck
• Web performance as a discipline — Core Web Vitals, bundle analysis, code splitting, virtualization, and profiling with real tooling
• Strong TypeScript — typing that catches real bugs instead of decorating the code
• Expert JavaScript (ES6+), HTML, and CSS/SCSS, including the modern layout model
• Proven ownership of frontend architecture at scale: module boundaries, shared component libraries, and state management strategy
• Fluency consuming APIs: REST and/or GraphQL, data-fetching and caching patterns (React Query, SWR, Apollo), and error states that hold up in production
• Design system experience: reusable, themeable, documented components built in partnership with Design
• Working knowledge of Python/Django — enough to read backend code, shape endpoints with backend engineers, and ship a small change yourself
• Deep React expertise — hooks, composition patterns, and the ability to reason about rendering behavior rather than guess at it
• Testing depth — Jest and React Testing Library, plus end-to-end coverage (Playwright or Cypress) people actually trust
• Accessibility fluency — WCAG 2.1 AA, semantic HTML, keyboard and focus management, screen reader testing
• 6+ years engineering experience, mostly frontend, including 3+ at a senior level owning projects end-to-end
• Internationalization, or SOLID design principles applied with judgment
• Cloud and infra exposure: GCP, Kubernetes, Docker, Terraform
• Build and monorepo tooling ownership (Vite, Webpack, CI pipelines)
• Styling systems (Material-UI, Tailwind) and state management (Redux, Zustand)
• Real-time UI: WebSockets, polling strategies, streaming or collaborative interfaces
• Data visualization at scale (D3, Recharts, Visx, canvas/WebGL)
• Frontend observability and performance budgets enforced in CI (Sentry, Datadog RUM)
• Server-side rendering (Next.js, Remix) and hydration tradeoffs