You will build and evolve customer-facing interfaces for AI Virtual Agents using React, TypeScript, Next.js and Vite, and refactor the frontend into a scalable platform with a shared component library and design system. Unitary’s factory builds custom operations agents that complete complex workflows end-to-end in customer tools.

Koinly★3.0 (1)· London

Work with React 19, TypeScript, TanStack (Router, Query, Table), Radix UI, Mantine, Tailwind CSS v4, Vite, Vitest, Storybook, Highcharts, Sentry, Bun, and RabbitMQ on a data platform that reconciles crypto transactions and tax obligations for Koinly’s web application, with a React Native mobile app joining scope later.

Senior WordPress Developer role: build bespoke WordPress sites and apps using PHP, MySQL, ACF, WooCommerce, Gutenberg, JavaScript (ES6+), SASS/SCSS, Git, Composer, npm, Vite, CI/CD. You’ll also drive AI-assisted development (RAG, MCP, Copilot) and mentor junior developers.

Perk★4.3 (50)· London

Senior engineers work with AI-connected Notion, Jira, GitHub and Slack, plus frontend patterns (state management, E2E/Cypress), backend techniques (API versioning, caching, data migration), and CI/CD. They join a cross-functional squad with ownership of a domain within Perk’s intelligent travel and spend management platform.

You will work with Java, Selenium, RestAssured, Gherkin, and Jira/Xray to design and maintain automated test frameworks. This cross-functional Agile squad develops complex healthcare software systems that support Genomics England’s genomic medicine and research initiatives for the NHS.

QA Engineer role using **Python** for test automation, with **Gherkin**-based test cases, **Jira/Xray**, and **CI/CD pipelines**. You will build and maintain automated test frameworks covering UI, API, integration, and regression testing for the software systems that underpin Genomics England’s genomic healthcare and research mission.

You will work with React, TypeScript, Next.js, Jest, Cypress, CSS-in-JS libraries, Git, and GraphQL. You will join the Customer Apps team to build and scale customer-facing applications for payment device management, loyalty schemes, and more at Dojo, the UK's largest payments acquirer.

HCLTech★3.7 (11k)· London

Work with React, TypeScript, HTML, CSS, JavaScript, Redux, WebSockets, SSE, REST APIs, micro-frontends, and unit testing tools like Jest/React Testing Library. The role delivers high-availability, low-latency UI applications, ideally for financial services or trading platforms.

Work with TypeScript, Python, Node.js, Playwright, Cypress, WebdriverIO, Docker, GitHub Actions/GitLab CI, bash, and Jira to build and maintain test automation frameworks and CI pipelines for Connected TV devices.

You will work with Java, JavaScript, Python, or C#; open-source frameworks like Cypress, Karate, PlayWright, or Selenium; CI/CD pipelines in Azure DevOps; and JMeter for performance testing. As part of an agile team, you’ll help clients achieve business transformation goals through automated and manual testing.

You will work with React, TypeScript, HTML, CSS, JavaScript, WebSockets, SSE, REST APIs, Redux, micro-frontends, SPA, React Testing Library/Jest, and optionally Playwright or Cypress. The role involves building time-critical, high-availability, high-performance UI applications, with an advantage for experience in financial services or trading platforms.

You'll use TypeScript, Python, Node.js, Playwright, Cypress, or WebdriverIO, plus Docker, GitHub Actions/GitLab CI, and bash. The Quality Engineering team builds test-automation frameworks and CI pipelines that run on real Connected TV devices, targeting global TV users.

React developer role using React, TypeScript, JavaScript, HTML, CSS, Redux, WebSockets, SSE, REST APIs, React Testing Library and Jest, with optional Playwright or Cypress. You will build time-critical, high-availability, high-performance UI applications, working across the full development lifecycle.

Work across the stack with React, TypeScript, and Node.js or Golang on privacy-focused systems and architecture that keep users' location data inaccessible. As part of Wheely's small core-engineering team, you'll collaborate with Product Managers, Designers, and Software Engineers to shape solutions from concept through production.

National Gas★0.0 (10)· London

You will work with Angular (v16+), ASP.NET Core / .NET, REST APIs, SignalR, SQL Server, MariaDB, and Azure. You will maintain existing ASP.NET websites and build a new real-time cloud-based operational system for National Gas.

You will work with Vue.js, Vuex, Pinia, Vite, TypeScript, and real-time data tools (WebSockets, SSE) to build high-performance trading UIs. The role is on the team that continuously improves Interactive Brokers’ critical platform for automated trade execution and custody across global markets.

Grid Dynamics★3.4 (19)· London

Build high-performance React and TypeScript trading applications using WebSockets, RSocket, and streaming market data. Work within an embedded team modernising a Tier 1 investment bank’s electronic trading platforms, migrating legacy Angular apps to React. Collaborate with backend Java engineers on mission-critical front-office systems.

Develops modern web applications using Angular, TypeScript, RxJS, and REST APIs on a cloud-native AWS platform. Works on a globally used flagship product, collaborating with product, UX, backend, and ML engineers.

The Head of QA will lead the transition from manual to automated testing, using tools such as Selenium, Cypress, Playwright, Postman/Newman, JUnit, pytest, CI/CD pipelines (GitLab CI, GitHub Actions), AI-powered testing tools, and cloud platforms (GCP, AWS) with Docker and Kubernetes. The team builds cloud-based aviation fuel management SaaS products digitising the full fuel lifecycle.

Build full stack applications using TypeScript, Go, and Angular, with AI-assisted development tools (Cursor, Claude Code, GitHub Copilot) and front-end testing via Playwright or Cypress. You'll join a technology company rethinking how software is built in an AI-first engineering environment, collaborating across engineering, product, data, and research teams.

You'll work with Playwright, Cypress, Selenium, Postman, Insomnia, React, React Native, Maestro, BrowserStack, Percy, k6, Gatling, GCP, Grafana, LogRocket and AI-assisted testing tools. You'll join Nando's USA Technology team building digital products powering customer journeys (Locate, Menu, Payments, Orders, Loyalty, Identity) across web and mobile to support US expansion.

Build full-stack applications with TypeScript, React, NestJS, Prisma, PostgreSQL, and AWS on the Reap Direct team, which develops client-facing web and mobile platforms for stablecoin-powered corporate cards, payments, and expense management tools.

You will work with TypeScript/JavaScript, React, Playwright or Cypress, Azure, and CI pipelines (Azure DevOps/GitHub Actions) to own quality for a modern React website augmented with an AI assistant, serving data exploration, charts, and dashboards. You will define test strategy, build automation frameworks, and test AI behaviour including guardrails.

You will work with Playwright, Selenium, Cypress, Cucumber, JIRA, REST APIs, and CI/CD tools. The role designs and maintains automated test solutions for complex banking applications, embedding quality through TDD, BDD, and scaled agile delivery.

You will work with React, Tailwind, Node.js, tRPC, PostgreSQL, and Elasticsearch to build and scale a B2B property data platform that integrates thousands of data sources. As a hands-on lead, you will provide architectural oversight across frontend, backend, and data infrastructure while mentoring senior and mid-level engineers.