1 to 25 of 55 Permanent Jest Jobs in London

and containerization using Docker and Kubernetes . Cloud Platforms: Experience with cloud environments, preferably Google Cloud Platform (GCP) . Automation & Testing: Hands-on experience with automated testing frameworks like Jest , Cypress , and Pact . Strong understanding of software architecture principles including microservices, service-oriented architecture (SOA), and design patterns. Proven ability to define technical solutions aligned with business goals and More ❯

and containerization using Docker and Kubernetes . Cloud Platforms: Experience with cloud environments, preferably Google Cloud Platform (GCP) . Automation & Testing: Hands-on experience with automated testing frameworks like Jest , Cypress , and Pact . Strong understanding of software architecture principles including microservices, service-oriented architecture (SOA), and design patterns. Proven ability to define technical solutions aligned with business goals and More ❯

and containerization using Docker and Kubernetes . Cloud Platforms: Experience with cloud environments, preferably Google Cloud Platform (GCP) . Automation & Testing: Hands-on experience with automated testing frameworks like Jest , Cypress , and Pact . Strong understanding of software architecture principles including microservices, service-oriented architecture (SOA), and design patterns. Proven ability to define technical solutions aligned with business goals and More ❯

and containerization using Docker and Kubernetes . Cloud Platforms: Experience with cloud environments, preferably Google Cloud Platform (GCP) . Automation & Testing: Hands-on experience with automated testing frameworks like Jest , Cypress , and Pact . Strong understanding of software architecture principles including microservices, service-oriented architecture (SOA), and design patterns. Proven ability to define technical solutions aligned with business goals and More ❯

shift-left approach by embedding quality early in the SDLC, writing unit, integration, and end-to-end tests alongside feature development. • Implement and maintain automated test suites using Playwright, Jest, and React Testing Library to ensure reliability and regression coverage. • Collaborate with cross-functional teams (UX/UI designers, product owners, QA, DevOps) to deliver well-scoped, high-quality features. More ❯

shift-left approach by embedding quality early in the SDLC, writing unit, integration, and end-to-end tests alongside feature development. • Implement and maintain automated test suites using Playwright, Jest, and React Testing Library to ensure reliability and regression coverage. • Collaborate with cross-functional teams (UX/UI designers, product owners, QA, DevOps) to deliver well-scoped, high-quality features. More ❯

shift-left approach by embedding quality early in the SDLC, writing unit, integration, and end-to-end tests alongside feature development. • Implement and maintain automated test suites using Playwright, Jest, and React Testing Library to ensure reliability and regression coverage. • Collaborate with cross-functional teams (UX/UI designers, product owners, QA, DevOps) to deliver well-scoped, high-quality features. More ❯

shift-left approach by embedding quality early in the SDLC, writing unit, integration, and end-to-end tests alongside feature development. • Implement and maintain automated test suites using Playwright, Jest, and React Testing Library to ensure reliability and regression coverage. • Collaborate with cross-functional teams (UX/UI designers, product owners, QA, DevOps) to deliver well-scoped, high-quality features. More ❯

decision-making and Agile delivery Mentor engineers and collaborate with stakeholders Drive innovation across full-stack solutions Your Toolkit Frontend: React.js (Hooks, Context API, Lifecycle) TypeScript & ES6+ Redux, Cypress, Jest Backend: Java 11+, Spring Boot RESTful APIs, Microservices PostgreSQL, Kafka Cloud & DevOps: AWS (EKS, MSK, Opensearch) CI/CD with Jenkins Monitoring: CloudWatch, Kibana Why You'll Love Working Here More ❯

and Git 1+ year with Tailwind CSS, Next.js, Express.js, MongoDB, and AWS/GCP High level of English language proficiency Bonus if you’ve worked with: Testing (Vitest/Jest) Docker CI/CD tools (e.g. GitHub Actions) Component libraries (e.g. Shadcn, MUI) Microservices Cloudflare or other CDNs Firebase Google Maps API Startup environments We Value The right candidate will More ❯

and Git 1+ year with Tailwind CSS, Next.js, Express.js, MongoDB, and AWS/GCP High level of English language proficiency Bonus if you’ve worked with: Testing (Vitest/Jest) Docker CI/CD tools (e.g. GitHub Actions) Component libraries (e.g. Shadcn, MUI) Microservices Cloudflare or other CDNs Firebase Google Maps API Startup environments We Value The right candidate will More ❯

and Git 1+ year with Tailwind CSS, Next.js, Express.js, MongoDB, and AWS/GCP High level of English language proficiency Bonus if you’ve worked with: Testing (Vitest/Jest) Docker CI/CD tools (e.g. GitHub Actions) Component libraries (e.g. Shadcn, MUI) Microservices Cloudflare or other CDNs Firebase Google Maps API Startup environments We Value The right candidate will More ❯

and Git 1+ year with Tailwind CSS, Next.js, Express.js, MongoDB, and AWS/GCP High level of English language proficiency Bonus if you’ve worked with: Testing (Vitest/Jest) Docker CI/CD tools (e.g. GitHub Actions) Component libraries (e.g. Shadcn, MUI) Microservices Cloudflare or other CDNs Firebase Google Maps API Startup environments We Value The right candidate will More ❯

Knowledge of state management frameworks (e.g. Redux, Flux, VueX, Realm) Appreciation of React design patterns and understanding of their use Familiarity with Front end unit testing tools e.g. Jasmine, Jest, MochaJS Knowledge of task runners (Grunt, Gulp, Webpack: Gulp is preferred, MSBuild) Sitecore 9/10 development experience would be of huge benefit Bootstrap 3+ Source control - Git and Gitflow More ❯

create intuitive user experiences Proven ability to work in both rapid prototyping mode and to ship/maintain large-scale products Knowledge of modern front-end testing frameworks like Jest or Cypress Familiarity with deploying software for Cloud Environments (AWS/Azure/GCP) (IaC experience such as Terraform is a plus) Experience with containerisation technologies like Docker (Kubernetes experience More ❯

deployment (e.g., GitHub Actions, CodePipeline). Ensure security, scalability, and performance best practices in all cloud-based solutions. Implement unit tests, integration tests, and end-to-end testing using Jest, Mocha, or other frameworks. Monitor, troubleshoot, and optimize existing systems for performance and cost-efficiency. Participate in agile ceremonies and contribute to architecture/design discussions. More ❯

and drive delivery Tech Stack You'll Work With: Back-End: C# (.NET Core, ASP.NET MVC 4.0+) Front-End: React, Next.js, TypeScript, Node.js, Tailwind, SASS Testing & Automation: Postman, NUnit, Jest DevOps & Cloud: Azure (Web Apps, Functions, Redis, Storage), Azure DevOps (YAML, Terraform) Other Tools: Git, SQL Server, Umbraco, Visual Studio, LaunchDarkly, Salesforce Marketing Cloud What You'll Bring: 5+ years More ❯

GraphQL, and AWS (EKS, Lambda, RDS). A proven track record in building resilient APIs and managing backend services/databases. Experience with TDD and testing frameworks such as Jest and Pact. Knowledge of CI/CD pipelines (ideally GitHub Actions). Hands-on experience with observability/monitoring tools (e.g., DataDog). A proactive, problem-solving mindset with the More ❯

JavaScript/TypeScript , Node.js , React , GraphQL , and AWS (EKS, Lambda, RDS) Strong background in building and maintaining robust APIs (REST and GraphQL) Proficiency with automated testing frameworks such as Jest and Pact Practical experience working with CI/CD pipelines (GitHub Actions or similar) Familiarity with observability and monitoring tools A proactive, solution-focused mindset with the ability to work More ❯

JavaScript/TypeScript , Node.js , React , GraphQL , and AWS (EKS, Lambda, RDS) Strong background in building and maintaining robust APIs (REST and GraphQL) Proficiency with automated testing frameworks such as Jest and Pact Practical experience working with CI/CD pipelines (GitHub Actions or similar) Familiarity with observability and monitoring tools A proactive, solution-focused mindset with the ability to work More ❯

JavaScript/TypeScript , Node.js , React , GraphQL , and AWS (EKS, Lambda, RDS) Strong background in building and maintaining robust APIs (REST and GraphQL) Proficiency with automated testing frameworks such as Jest and Pact Practical experience working with CI/CD pipelines (GitHub Actions or similar) Familiarity with observability and monitoring tools A proactive, solution-focused mindset with the ability to work More ❯

JavaScript/TypeScript , Node.js , React , GraphQL , and AWS (EKS, Lambda, RDS) Strong background in building and maintaining robust APIs (REST and GraphQL) Proficiency with automated testing frameworks such as Jest and Pact Practical experience working with CI/CD pipelines (GitHub Actions or similar) Familiarity with observability and monitoring tools A proactive, solution-focused mindset with the ability to work More ❯

best practices: memoization, virtualization, code-splitting, lazy loading, minimizing re-renders; use React Profiler and browser devtools Secure frontend practices (XSS/CSRF mitigation, CSP, input sanitization) Testing with Jest and React Testing Library Understanding of modern build tooling (Vite/Webpack), bundling, and asset delivery Here's what we're looking for: Technical Skills Solid engineering experience across frontend More ❯

applications or web integration. Familiarity with Edge AI : Understanding of on-device ML, including privacy-preserving techniques. Testing Frameworks : Experience with unit and integration testing tools for React Native (Jest, Detox) and ML model validation. Performance Monitoring : Knowledge of tools for monitoring and improving mobile app and model performance in production (e.g., Firebase, Sentry). Database Management : Experience with local More ❯

applications or web integration. Familiarity with Edge AI : Understanding of on-device ML, including privacy-preserving techniques. Testing Frameworks : Experience with unit and integration testing tools for React Native (Jest, Detox) and ML model validation. Performance Monitoring : Knowledge of tools for monitoring and improving mobile app and model performance in production (e.g., Firebase, Sentry). Database Management : Experience with local More ❯