1 to 25 of 29 Vitest Jobs in London

Well‐versed writing, maintaining and reviewing TypeScript code at production Serverless infrastructure and AWS eco system Modern React with hooks, experience writing unit tests (Vitest, RTL) for components Modern CSS styling: Tailwind, CSS Modules, style‐dictionary and design tokens Redux experience is valued but not required - we use React Query ...

TypeScript, JavaScript, HTML and CSS Experience integrating with REST APIs Solid .NET/ASP.NET Core experience Experience with automated testing tools such as Playwright, Vitest, Cypress or Jest Experience using Claude Code or similar AI-assisted development tools Git, CI/CD and Agile delivery experience Desirable Microsoft Azure Bicep ...

TypeScript, JavaScript, HTML and CSS Experience integrating with REST APIs Solid .NET/ASP.NET Core experience Experience with automated testing tools such as Playwright, Vitest, Cypress or Jest Experience using Claude Code or similar AI-assisted development tools Git, CI/CD and Agile delivery experience Desirable Microsoft Azure Bicep ...

ticketing, or eCommerce platforms. Familiarity with backend integration using GraphQL. Experience with TypeScript, Vue, and similar tools. Knowledge of testing frameworks such as Cypress, Vitest, or Jest. Understanding of mobile/responsive UI development and/or hybrid app frameworks (e.g., Capacitor or Ionic). What you’ll be doing ...

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 ...

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/ ...

management and modern React patterns Commercial experience building and consuming REST APIs Working knowledge of backend technologies (Node.js, Ruby) Solid understanding of frontend testing (Vitest, Jest) Understanding of clean code within both OOP and FP Experience with PostgreSQL and SQL optimization Proficiency with Git and modern CI/CD practices ...

FastAPI, Polars, LangChain Frontend: React (TanStack Query/React Router/react-hook-form + Zod), TypeScript, nx.dev, Tailwind CSS/shadcn/ui, Vitest/Playwright/MSW, Vite, Recharts Platform: Azure, Azure DevOps (CI/CD), Kubernetes, Docker, cloud storage, messaging and events, Git, SonarQube ...

builder : Cursor, v0 , Claude Code (and friends) are daily drivers for rapid prototyping and refactors. React + TypeScript mastery: component design, hooks, performance, testing (Vitest/Jest, Playwright). FastAPI expertise: async patterns, Pydantic schemas, pagination, auth (OAuth2/OIDC), rate‐limits, background jobs. Elasticsearch fluency: mappings/analyzers (ngrams ...

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 ...

CloudFormation or Terraform where customer environments require them Build and maintain CI/CD pipelines (GitHub Actions) and automated test suites: Jest/Vitest unit tests, Playwright E2E and API tests, and integration tests against live Connect instances Follow phased rollout patterns for production contact centers where downtime is measured ...

state, i18next for multi-language support (FR/EN/ES), Sentry for monitoring, Mixpanel for analytics, GrowthBook for feature flagging. Testing with Vitest/Playwright, linting/formatting with Biome. Mobile : a native iOS app (Swift) dedicated to multi-screen casting in our rooms, with GitHub Actions CI/ ...

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 ...

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/ ...

Livewire Knowledge of Next.js or Nuxt.js Experience with WebSockets and real-time applications Understanding of web accessibility (WCAG) standards Experience with testing frameworks (Jest, Vitest, Cypress) Familiarity with UI/UX design principles Experience building interactive interfaces and modern UIs Competitive salary based on experience Latest development equipment and tools ...

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 ...

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 ...

with state management libraries, such as Zustand. Ability to write clean, maintainable and testable code. Experience with writing automated tests and testing frameworks like Vitest and Playwright. Experience consuming and helping shape REST API contracts, including working with an OpenAPI specification. Ability to implement beautiful styles using CSS. Real experience ...

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 ...

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 ...

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 ...

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 ...

well Desirable: energy domain knowledge Our stack React (required) TypeScript (required) Next.js on Vercel (desirable) GraphQL w/Tanstack Query (desirable) React Testing Library & vitest and/or msw (desirable) We have a preference for candidates who can work hybrid from our London office, but we're open to fully ...