16 of 16 Vitest Jobs in London

development and design systems (e.g. Storybook) REST and GraphQL API integration Build tooling such as Vite or Webpack Automated testing with tools such as Vitest, Jest, Cypress or Playwright Responsive, accessible UI development (WCAG standards) CSS architecture (e.g. Tailwind, SCSS, CSS Modules) Git and modern software development workflows CI/ ...

services such as identity-verification and lead-management providers behind clear interfaces. Write unit, component and end-to-end tests using tools such as Vitest, Testing Library and Playwright. Investigate defects, use logs and development tools to understand their cause, and deliver well-tested fixes. Follow secure development practices ...

quickly get up to speed on) our stack: React Native/Expo, Railway, GitHub (incl. CI and end-to-end testing), Playwright, Vite/Vitest, Google Cloud, AWS, Twilio, and Stripe Eligible to work in the United Kingdom Nice to Have: TanStack Start/Router experience A passion for music ...

quickly get up to speed on) our stack: React Native/Expo, Railway, GitHub (incl. CI and end‐to‐end testing), Playwright, Vite/Vitest, Google Cloud, AWS, Twilio, and Stripe Eligible to work in the United Kingdom Core Competencies Demonstrates strong full-stack engineering capabilities with expertise in TypeScript ...

cost optimisation and FinOps principles. Experience operating in regulated, security‐sensitive, or high‐availability environments. Experience with test automation frameworks such as PyTest, UnitTest, Vitest, Jest, or similar. AWS certifications in Architecture, DevOps, Security, Networking, Data, or Machine Learning. Required Competencies Strong analytical and problem‐solving skills, with the ability ...

knowledge of state management (RxJS, or React Query + custom streams) and data flow patterns for streaming + request/response. Testing: Jest/Vitest, React Testing Library, Playwright; strong mock/contract testing. Security: XSS mitigation, CSP, auth flows (OAuth), secure storage, anti phishing UX. CI/ ...

while remaining collaborative and outcome-focused. Technical Skills React 18 TypeScript (Strict Mode) TanStack Query, Form and Router Tailwind CSS Radix UI/shadcn Vitest React Testing Library Mock Service Worker (MSW) Nice to Have While not essential, experience in any of the following would be highly beneficial: Auth0 ...

HTML5 and CSS3, including responsive design, accessibility and cross-browser compatibility Experience with modern front-end tooling: build systems (Vite, rollup), testing frameworks (Vitest, Playwright) and CI/CD pipelines Familiarity with AI concepts and tooling — including AI-assisted development, LLM integration in web applications; practical experience is a strong ...

React Three Fiber, WebGL, Deck.gl ) Real-time data flows: Comfortable working with real-time data and async patterns (Websockets, workers) Writing testable, reusable code: Vitest/Jest/Playwright, Storybook, design systems Data visualisation: Presenting complex data intuitively; geospatial experience is a plus. UX/UI (desirable): A strong sense ...

identity verification, document upload, and OpenAPI-generated API clients Experience implementing roles and permissions in both the interface and API Habit of testing with Vitest, React Testing Library, and MSW against coverage gates Experience building accessible software to WCAG 2.1 AA standards with Tailwind, Radix/shadcn, and Storybook Real ...

third-party services, including identity-verification and lead-management providers, while keeping transport details behind well-defined interfaces. Write meaningful tests at every layer: Vitest unit and route tests, Testing Library component tests, and Playwright end-to-end journeys against a real database running in Docker. Build with the needs ...

engineers rely on day to dayYou know Playwright well for browser end-to-end testing and you're comfortable with unit and component testing (Vitest or similar) and visual regression.You're fluent in TypeScript, Vite and modern front-end tooling.You've designed GitLab CI pipelines that stay fast and reliable ...

scale data visualizations.- Collaborating across teams to influence API design and ensure seamless frontend-backend integration.Our Tech Stack:- Languages & Frameworks: React (TypeScript)- Testing Tools: Vitest (unit testing), Cypress (E2E testing)- Build Tools: Vite (for local development and production bundling)- Custom Solutions: Internal design system, advanced caching mechanisms, and proprietary state ...

Strong React, TypeScript and RxJS experience. Experience with Redux/Context API, WebSockets and Vite. Knowledge of micro-frontends and modular architecture. Experience with Vitest, Playwright, Storybook or similar. OpenFin experience is advantageous. Financial markets experience, particularly FX, Fixed Income or Electronic Trading, is highly desirable. Strong communication, leadership ...

skills; able to design and build robust, well-typed libraries and components Experience with modern front-end tooling: build systems (Vite,rollup), testing frameworks (Vitest,Playwright) andCI/CD pipelines Familiarity with AI concepts and tooling — including AI-assisted development, LLM integration in web applications; practical experience is a strong ...

single page application that runs on React 18, TypeScript (strict), TanStack Query/Form/Router, Tailwind + a Radix/shadcn component system, Vitest + RTL + MSW. You make the design calls on your domain and argue them out with the tribe. You build … verification, document upload and OpenAPI-generated API clients. Roles and permissions. Enforced in the interface as well as the API. Testing as a habit. Vitest, React Testing Library and MSW, against a coverage gate that fails the build. You can say what a piece of code is actually protected against. ...