1 to 25 of 108 Jest Jobs in the UK

and other modern frontend frameworks. DevOps: Familiarity with CI/CD tools (GitHub, Jenkins, Harness), Docker, Kubernetes, and cloud platforms (GCP preferred). Automation: Experience with automated testing frameworks (Jest, Cypress, Pact, etc.). ABOUT WORKING FOR US Our ambition is to be the leading UK business for diversity, equity and inclusion supporting our customers, colleagues and communities and we More ❯

and interfacing with the content/asset delivery APIS. Experience of developing and maintaining infrastructure as code. Experience with unit, integration, and end to end testing tools and practices (Jest, Playwright). Understanding of Microservices & principles of RESTful API development, including structuring, documenting, versioning, testing and stubbing/mocking. Experience performing code reviews and following up with learning opportunities. Experience More ❯

services (AWS, Azure, or GCP) and deploying applications in a containerised environment (Docker/Kubernetes). Good understanding of CI/CD pipelines, Git workflows, and automated testing frameworks (Jest, Cypress, etc). Ability to translate UI/UX designs into high-quality, responsive code. Experience collaborating in an Agile team, participating in code reviews and sprint planning. Excellent communication More ❯

with database management systems 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 and workflows. Excellent problem-solving More ❯

complex bugs, identifying root causes, andimplementing robust solutions for production issues. Champion and implement frontend best practices in areas such as performance optimization, code quality, testing (React Testing Library, Jest, etc.), accessibility, and maintainability. Drive improvements and innovation in ourfrontend architecture, tooling (NPM, Webpack, Vite), and development processes. Technologies We Use Languages & Frameworks: JavaScript (ES6+), TypeScript, React, Next.js, Redux, HTML5 … CSS3/SCSS Testing: React Testing Library, Jest, Cypress (or similar) Build & Tooling: NPM, Webpack, Vite (or similar modernbundlers), Babel DevOps & Tools: AWS (S3, CloudFront, etc.), GitlabCI/CD, Git Backend Interaction: RESTful APIs (from Grails/Java services) Qualifications Must haves: 5-7+ years of proven track record in frontend development, with a strongportfolio of building complex, scalable … web applications using JavaScript, CSS, and HTML. Expert-level experience with React, Next.js, and state management libraries like Redux. Proficient with React Testing Library, Jest, or similarfrontend testing frameworks. Demonstrated ability to lead technical design discussions, collaborate effectively with UI/UX, andtranslate complex requirements into technically feasible and elegant designs. Deep experience setting up, configuring, and optimizing modern JavaScript More ❯

Use modern testing practices and frameworks integrated with CI/CD pipelines. Strong experience of test first development and unit testing with modern testing frameworks and tools such as Jest, Enzyme, React Testing Library, Pact, Cypress and Playwright. DevOps: Familiarity with CI/CD and build pipelines, using tools such as Github , Harness, Jenkins, Docker, ELK, Grafana and Dynatrace. Take More ❯

. Solid understanding of web technologies (HTML5, CSS3, responsive design principles). Familiarity with modern UI frameworks (Material UI, Tailwind CSS, or similar). Experience with frontend testing frameworks (Jest, React Testing Library, Cypress). Knowledge of AWS cloud services and integration with serverless backend architectures (beneficial). Knowledge of WCAG standards and accessibility best practices. Interest or experience in More ❯

and websockets for real-time LLM responses. Optimize bundle size, lazy-loading, and runtime performance. Set up and enforce unit, integration, and end-to-end (E2E) test suites using Jest, React Testing Library, and Cypress. Define coding standards, linting, and Prettier rules; perform code reviews. Build micro-interactions that capture user ratings, corrections, and free-text feedback. Emit structured telemetry More ❯

delivering frontend features. Quality Assurance: Contribute to ensuring the highest quality in all frontend applications through testing, documentation, and code reviews. Testing: Implement automated testing using tools such as Jest and React Testing Library , and contribute to the development of end-to-end tests using Cypress . Key Skills & Experience Core Frontend Expertise: Demonstratable experience in in JavaScript , Typescript , and … React (including Hooks). Testing Experience: Experience in unit and integration testing with Jest and React Testing Library . Familiarity with end-to-end testing using Playwright , Cypress , or similar frameworks. CI/CD & DevOps: Understanding of CI/CD pipelines and modern DevOps tools. Familiarity with Azure DevOps Pipelines is a plus. UX/UI Understanding: Familiarity with UX More ❯

are a plus: Understanding of Software Engineering Principles: SOLID, design patterns, TDD, BDD, DDD, Enterprise Architecture Frontend technologies: HTML, CSS, JavaScript, Typescript, React Experience with testing frameworks: JUnit, Spock, Jest Integration frameworks such as Apache Camel Other scripting languages Experience with O2C applications and payment gateways Familiarity with product tracking tools like Jira Experience working in Agile environments (SCRUM, Kanban More ❯

Understanding of Software Engineering Principles: SOLID, design patterns, TDD, BDD, DDD, Enterprise Architecture Patterns Frontend Technologies: HTML, CSS, JavaScript, Typescript, React Experience with unit and integration testing: JUnit, Spock, Jest Experience with integration frameworks such as Apache Camel Other languages and scripting: nix scripting Experience with O2C applications and payment gateways Experience with tracking tools like Jira Experience working in More ❯

. Knowledgeable in Cloud Environments (AWS) and deploying applications. Capable of translating business requirements into technical ones and adept at problem-solving. Experienced in UI testing and benchmarking (JUnit, jest, puppeteer, playwright) and configuring CI/CD pipelines. Proficient in agile development, demonstrating ownership and a commitment to writing high-quality code. Cultural add is as equally as important to More ❯

Code Quality: Participate in code reviews and contribute to the development of best practices to enhance code quality and maintainability. Implement Testing Strategies: Utilize testing frameworks like Playwright and Jest to ensure the reliability and stability of the codebase through rigorous testing practices. Stay Current with Technologies: Continuously explore and implement cutting-edge technologies, frameworks, and tools to enhance our … create visually appealing interfaces. Developer-Centered Approach: Experience in building UIs for a developer, DevOps or SRE audience. Testing Frameworks: Proficiency in using testing frameworks such as Playwright and Jest to ensure high code quality and user experience. Version Control: Proficient in using Git for version control and collaboration on code repositories. Problem-Solving Skills : Strong analytical and problem-solving More ❯

Core , and Azure Solid understanding of frontend frameworks (React preferred), state management , and component-based architecture Experience with SQL , Git , Postman , JSON/XML , and automated testing frameworks (e.g., Jest, Vitest) Familiarity with CI/CD tools , source control , and agile development methodologies Bonus: Experience with Umbraco , SharePoint , or AI/ML integration Strong problem-solving skills, attention to detail More ❯

and/or .NET Core. Solid grasp of component-based architecture, client-server integration and front-end performance optimisation. Test-driven mindset with demonstrable experience in: Unit testing (e.g. Jest, XUnit) Integration and E2E testing (e.g. Cypress) Proficient in Git and working with version control in collaborative teams. Desirable Skills and Experience Experience using SQL databases (bonus if using Entity More ❯

and/or .NET Core. Solid grasp of component-based architecture, client-server integration and front-end performance optimisation. Test-driven mindset with demonstrable experience in: Unit testing (e.g. Jest, XUnit) Integration and E2E testing (e.g. Cypress) Proficient in Git and working with version control in collaborative teams. Desirable Skills and Experience Experience using SQL databases (bonus if using Entity More ❯

GraphQL . Understanding of event-driven architectures and message queues (e.g., Kafka , RabbitMQ ). Knowledge of performance optimization tools and strategies for backend systems. Familiarity with testing frameworks (e.g., Jest , Cypress , Playwright ) for unit, integration, and end-to-end testing. Familiarity with CI/CD pipelines and DevOps tools (e.g., GitHub Actions , Docker , Kubernetes ). Exposure to cloud platforms such More ❯

ES6+), Node.js, and React, with 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, well-documented, and clean JavaScript More ❯

and Node, Java, and with the use of IaC tools such as Terraform and AWS CloudFormation. Experience with unit, integration, and end-to-end testing tools and practices (e.g. Jest, Cypress, Backstop, Playwright). Experience with CI/CD and Trunk Based Development. Experience with observability tools and practices, including monitoring, logging, and tracing to ensure system reliability and performance. More ❯

requirements. Integrate and optimize REST APIs for data retrieval and manipulation. Develop reusable components and ensure consistency across applications. Write and maintain high-quality, testable code with tools like Jest and Playwright. Perform data wrangling tasks and contribute to data analysis processes where necessary. Troubleshoot, debug, and enhance existing applications to improve performance and reliability. Why Join Us? This role … that values innovation, learning, and collaboration. Required Skills & Experience Web Development: Proficient in React and TypeScript. Data Visualization: Experience with libraries such as Highcharts and D3.js. Testing: Familiarity with Jest and Playwright or similar testing frameworks. REST APIs: Strong understanding of integrating and working with RESTful services. Data Skills: Experience in data wrangling/analysis (e.g., using SQL or Python More ❯

and JavaScript Node.js React Docker and containerized development workflows Git and version control NoSQL databases - MongoDB and Redis AWS services - EC2, Lambda, S3, and CloudWatch RESTful APIs Testing frameworks - Jest , Mocha , or similar CI/CD pipelines Start-up background Salary They offer a strong all round package with a base salary of up to £60,000 with some added More ❯

and JavaScript Node.js React Docker and containerized development workflows Git and version control NoSQL databases - MongoDB and Redis AWS services - EC2, Lambda, S3, and CloudWatch RESTful APIs Testing frameworks - Jest , Mocha , or similar CI/CD pipelines Start up background Salary They offer a base salary of £50,000 and £60,000 Equity. Location This client has an office in More ❯

CD pipelines using GitHub, GitLab, Terraform, Ansible, or Puppet. Ensure application security (OAuth 2.0, OIDC, CSRF, CORS, cookie management). Write and maintain unit and functional tests (Cypress, Mocha, Jest, etc.). Monitor and troubleshoot applications using Splunk, StackDriver, Datadog, or Grafana. Work with SQL and NoSQL databases including PostgreSQL, MySQL, MongoDB, and Redis. Optimise Back End performance for high More ❯

Actions), Observability (AWS, Grafana). Development tools: GitHub, Jira, Notion, ChatGPT, Gemini, LangChain, AI-native IDE's (Cursor, JetBrains), LLM-powered internal tools. Test automation: Cypress (E2E), Postman (API), Jest (frontend unit), PHPUnit (backend unit), JUnit (Android), XCTest (iOS). WHAT WE OFFER YOU A front-row seat in a fast scaling, early stage startup. Working on cutting edge problems More ❯

understanding of web accessibility, responsive design, and usability principles. Experience working with other teams, including backend, devops, and product stakeholders. Familiarity with CI/CD pipelines, testing frameworks (e.g., Jest, React Testing Library), and version control using Git. Experience with advanced state management solutions (e.g., Redux, Zustand, Recoil). Experience integrating with GraphQL and RESTful APIs. An understanding or curiosity More ❯