1 to 25 of 63 Jest Jobs in London

e.g., MySQL, PostgreSQL, MS SQL Server, MongoDB. Familiarity with Git and branching strategies such as GitOps. Solid understanding of testing frameworks and methodologies e.g. Jest, Mocha, Selenium. Ability to write and maintain unit, integration, and end-to-end tests. Ability to write and understand design documentation using C4, sequence diagrams More ❯

ES6+, React, Redux, Node.js , and related front-end technologies. Experience with RESTful APIs, JSON, WebSockets , and asynchronous programming. Solid understanding of testing frameworks (e.g., Jest, Mocha, Cypress). Knowledge of build tools like Webpack, Babel, or Vite and experience with Git-based workflows. Comfortable working in Agile environments , with tools More ❯

front-ends - React.js, Angular or Vue HTML, CSS, JavaScript (ES6) or TypeScript Webpack or Gulp A client-side Unit Testing framework e.g., Mocha or Jest Other technical skills API Management and Documentation (Swagger.io, I/O Docs) Experience with high scale, highly transactional, high performance, highly available systems and robust More ❯

Automation:Implementing and maintaining continuous integration/continuous deployment pipelines to accelerate development cycles. Code Quality and Testing:Experience with automated testing frameworks (e.g., Jest, JUnit) and best practices for ensuring code quality. DevOps Practices:Expertise in DevOps, particularly around automating deployment, monitoring, and scaling applications. Communication:Able to confidently More ❯

practical experience using CI/CD tools. Specifically AWS Code Build and GitHub. Minimum 5 years experience working with testing frameworks such as Cypress, Jest and Enzyme/RTL. Practical experience working with AB testing Technologies (we use Conductrics but experience with other equivalent tools such as AB Tasty or More ❯

problem-solving skills and ability to work in a fast-paced environment. Understanding of DevOps practices, CI/CD pipelines, and frontend testing frameworks (Jest, Cypress). Preferred Qualifications: Experience with UI/UX principles and design systems . Knowledge of server-side rendering (Next.js) and static site generation . More ❯

problem-solving skills and ability to work in a fast-paced environment. Understanding of DevOps practices, CI/CD pipelines, and frontend testing frameworks (Jest, Cypress). Preferred Qualifications: Experience with UI/UX principles and design systems . Knowledge of server-side rendering (Next.js) and static site generation . More ❯

Next.js/Node/Redux/React Context API/State management. Build tools: Webpack and Rollup. CSS/SCSS/SCSS Modules. Testing: Jest, React Testing Library, Enzyme. Experience with micro-fronted architecture. Familiarity with UX tools such as Figma and the Adobe Suite. Experience working with Azure DevOps More ❯

Next.js/Node/Redux/React Context API/State management. Build tools: Webpack and Rollup. CSS/SCSS/SCSS Modules. Testing: Jest, React Testing Library, Enzyme. Experience with micro-fronted architecture. Familiarity with UX tools such as Figma and the Adobe Suite. Experience working with Azure DevOps More ❯

demonstrating ownership, urgency, and the ability to drive initiatives independently. Solid Background in Automated Testing: Including both unit and e2e tests, using frameworks like Jest & Cypress. Containerization and Orchestration: Experience with Docker and Kubernetes. Cloud Services Familiarity: Knowledge of cloud platforms like AWS, Azure, or GCP. Preferred Applied AI: Previous More ❯

/REST APIs Knowledge of the web platform, including HTML, CSS and Browser APIs Experience with the testing pyramid and tools such as Vitest, Jest, Playwright Understanding of CI/CD practices and deployment pipelines Proficient in using version control systems (Git) Nice to have: Experience with design systems and More ❯

/REST APIs Knowledge of the web platform, including HTML, CSS and Browser APIs Experience with the testing pyramid and tools such as Vitest, Jest, Playwright Understanding of CI/CD practices and deployment pipelines Proficient in using version control systems (Git) Nice to have: Experience with design systems and More ❯

a solid understanding of their ecosystems. Experience with modern development tools and practices, such as Git, CI/CD pipelines, automated testing frameworks (e.g., Jest, Mocha), and containerisation technologies (e.g., Docker). Knowledge of RESTful API design and development, and familiarity with web services architecture. Ability to write efficient, secure More ❯

demonstrating ownership, urgency, and the ability to drive initiatives independently. Solid Background in Automated Testing: Including both unit and e2e tests, using frameworks like Jest & Playwright. Containerization and Orchestration : Experience with Docker and Kubernetes. Cloud Services Familiarity : Knowledge of cloud platforms like AWS, Azure, or GCP. Preferred Applied AI: Previous More ❯

is a plus · Understanding of trading workflows, market data, or order management systems is a plus Testing & Quality · Experience with frontend testing frameworks (e.g., Jest, React Testing Library) · Understanding of automated testing and CI/CD pipelines is a plus Soft Skills & Collaboration · Strong communication skills · Comfortable with rapid release More ❯

is a plus · Understanding of trading workflows, market data, or order management systems is a plus Testing & Quality · Experience with frontend testing frameworks (e.g., Jest, React Testing Library) · Understanding of automated testing and CI/CD pipelines is a plus Soft Skills & Collaboration · Strong communication skills · Comfortable with rapid release More ❯

Proven experience with React and modern front-end development workflows. Strong proficiency in Node.js and backend development principles. Familiarity with testing frameworks such as Jest and Cypress. A deep understanding of modern CSS, layout methodologies, and styling techniques. Experience integrating seamlessly with APIs (REST and/or GraphQL). Exposure More ❯

architecture. Experience with cloud platforms and service configurations within AWS or Digital Ocean. Understanding of blockchain technology fundamentals. Experience with testing frameworks such as Jest, Cypress, or Mocha. Knowledge of Agile methodologies and DevOps principles. Excellent problem-solving and debugging skills. Strong written and verbal communication skills. Ability to self More ❯

CI/CD Pipelines o Proficiency in Unit Testing REACT EXPERIENCE: o ReactJS, React Query, NodeJS, JavaScript, TypeScript, CSS, HTML o Testing tools like Jest, Cypress, Material UI o Experience with HTML, CSS, and writing cross-browser-compatible code o Experience with popular ReactJS workflows (such as Redux or MobX More ❯

in TypeScript, React, GraphQL, Redux, and CSS-in-JS Familiarity with the React reconciliation process and browser debugging tools Experience in functional programming and Jest for testing Bonus Experience Knowledge of RxJS, Node.js, WebSockets, Vite/ESBuild, Docker, and more Familiarity with back-end technologies such as C#, Kafka, and More ❯

in TypeScript, React, GraphQL, Redux, and CSS-in-JS Familiarity with the React reconciliation process and browser debugging tools Experience in functional programming and Jest for testing Bonus Experience Knowledge of RxJS, Node.js, WebSockets, Vite/ESBuild, Docker, and more Familiarity with back-end technologies such as C#, Kafka, and More ❯

React JS. Familiarity with cloud platforms like Azure and data retrieval libraries such as react-query. Testing Savvy: Experience with testing frameworks like Playwright, Jest, and React Testing Library. Design and Usability: Working knowledge of Material-UI library and a keen eye for UX improvement. Collaborative Spirit: Strong communication and More ❯

React JS. Familiarity with cloud platforms like Azure and data retrieval libraries such as react-query. Testing Savvy: Experience with testing frameworks like Playwright, Jest, and React Testing Library. Design and Usability: Working knowledge of Material-UI library and a keen eye for UX improvement. Collaborative Spirit: Strong communication and More ❯

or AWS CloudFormation. Familiarity with ELK stacks. Design : Figma APIs : REST, GraphQL Back-End : Node.js, Express.js CI/CD : CircleCI, GitHub Actions Testing : Cypress, Jest, Karma What You Can Expect from Our Recruitment Process: We'll start by reviewing your CV. Then, you'll have a one-hour interview with More ❯

Professional experience working with Git, Git Flow Knowledge of CSS preprocessors, (eg. SASS/LESS/CSS-in-JS/Tailwind) Experience testing with Jest/React Testing Library Desirable experience with DevOps tools Desirable experience with Websockets Desirable experience with ES6, Styled Components, Material UI Desirable experience with OpenFin More ❯