16 of 16 Permanent Vitest Jobs in London

with modern React patterns (hooks, context, state management) Experience with frontend testing strategies and tools (unit, integration and end‐to‐end), e.g., Jest/Vitest, React Testing Library, Playwright/Cypress Accessibility‐first delivery (WCAG), including semantic HTML and assistive technology testing Web performance optimisation and profiling, including Core ...

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 ...

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/ ...

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 ...

enough to see what the framework is doing for you. Accessibility in practice: keyboard, focus, screen reader. Useful, not required TypeScript. Testing with Jest, Vitest or Playwright. #J-18808-Ljbffr ...

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 ...

requirements You must have experience and practical knowledge in: TypeScript Next.js and React Unit testing with libraries like Jest, React Testing Library, or vitest e2e testing tools like Cypress or Playwright Strong problem - solving skills and attention to detail A passion for engineering craft - you practise writing maintainable code, reviewing ...

functionally with Product, Design, Compliance, and other engineering teams to deliver impactful solutions Frontend: React, TypeScript, Material-UI Module Federation (Micro-frontend architecture) Vite, Vitest Python 3.13, FastAPI LangGraph (AI agent orchestration) LlamaIndex (RAG/vector search) AWS Bedrock Infrastructure: AWS (ECS Fargate, Lambda, API Gateway, S3) Terraform, GitHub Actions ...

Enough plain JavaScript to know what the compiled output does. Git in daily use. Useful, not required Monorepo tooling and shared packages. Testing with Vitest, Jest or Playwright. #J-18808-Ljbffr ...

TypeScript expertise: significant commercial experience building complex production web applications Experience with modern testing frameworks, including integration and end-to-end testing (e.g. Vitest, Playwright) Comfortable owning outcomes, making decisions, and pushing work over the finish line in a fast-moving environment Ability to collaborate effectively with backend engineers, domain ...

focuses, React and TypeScript, styled with Panda CSS and built on React Aria for accessible behaviour. Components are developed in Storybook and tested with Vitest and Playwright, including visual regression. The toolchain is pnpm, Turborepo and Oxlint, with CI on GitHub Actions. On iOS and Android, the design systems ...

strong eye for detail and product quality Experience creating reusable component libraries and scalable frontend architecture Strong understanding of modern testing practices (Playwright, Vitest, Jest, React Testing Library etc.) Comfortable collaborating closely with engineers, product teams and non-technical stakeholders Ability to work autonomously and deliver at pace Contract Details ...

reports from the analysis pipeline. Role requires deep React and TypeScript expertise, 6+ years of experience, and familiarity with modern testing tools such as Vitest and Playwright. Remote considered with good UK time-zone overlap. #J-18808-Ljbffr ...

producing software that brings true delight to users. Core Technology Stack Frontend & UI Architecture: React v19, Next.js v16 (app Router), Typescript, TanStack Query v5, ViTest AI Productivity Tools Claude, ChatGPT, GitHub Copilot How you can make an impact Core Mission: Build secure, scalable full-stack identity workflows using modern C# … proficiency with React 1 9, TypeScript, Next.js (App Router), and TanStack Query v5. Validation & Testing: Production experience with FluentValidation, xUnit for backend testing, and ViTest for frontend utility/component testing. Architectural Patterns: Deep appreciation for CQRS, SOLID, DRY principles, and secure Backend-for-Frontend (BFF) patterns. Enterprise Security & Identity ...

using Ant Design and SCSS Integrate with AWS Amplify, AppSync, and GraphQL services Implement internationalisation (i18n) across the platform Write high-quality tests using Vitest, Testing Library, and MSW Drive improvements in performance, maintainability, and developer experience Participate in code reviews, architecture discussions, and technical decision-making Collaborate closely with … Experience building responsive, accessible web applications Working knowledge of GraphQL and AWS Amplify Experience implementing i18n in production applications Strong testing practices using Vitest, Jest, Testing Library, or similar Familiarity with ESLint, CI/CD workflows, and frontend quality tooling Nice to Have AWS certifications Experience with AppSync Passion ...