React Query, Redux or alternative state management libraries (e.g. MobX).Solid understanding of HTML, CSS, JavaScript, and modern browser APIs.Familiarity with modern frontend tooling (Vite/Webpack, ESLint, and package managers such as npm/pnpm).Experience with automated testing, such as end-to-end tests (Playwright, Selenium), UI/… Component tests (e.g. using Jest), or snapshot tests.STEM (technical) degree.Our current stack: Go microservices, shrinking Ruby monolith, Node.js, TypeScript, React, React Query, Vite, MongoDB, PostgreSQL, RabbitMQ, GRPC, Thrift, Redis, AWS, Terraform, K8S.What we OfferOffice-based role in West London, four days a week with flexible start and finish times, plus ...