Use Selenium, Playwright, Postman, JMeter, Jira, SQL, Git, Jenkins, and Azure DevOps to design and execute manual and automated tests. Validate merchant onboarding, payment processing, settlements, terminal management, and Lloyds Accept application flows across web, mobile (iOS/Android), and API systems.

Lead UI Developer role using TypeScript, React, RxJS, WebSockets/SSE, GraphQL, Protobuf, Flatbuffers, Jest/Vitest, React Testing Library, Playwright, and AG Grid. You will own the front-end architecture for a real-time Single Dealer Platform used by Sales, Trading, and institutional clients globally, building low-latency trading applications for market data, pricing, RFQ, and trade capture.

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.

You'll work with Blazor, Razor pages, MVC, C# .NET, ASP.NET Core APIs, MS SQL Server, Azure data technologies and Azure DevOps. The Analytics Product Engineering team builds and manages a bespoke analytical platform for insurance pricing, exposure management, event response and underwriting tools.

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 C#, ASP.NET Core, React/Angular/Blazor, REST APIs, Git, Azure/AWS, and CI/CD tools. The role is with 83zero, though the listing does not specify a particular team or product project.

As Principal SDET, you will lead quality engineering using C#, Playwright, and Selenium for test automation across UI, API, and integration layers. You will drive the quality strategy for a financial services organisation undergoing a major business and technology transformation. This is a senior technical leadership role, not managing a specific team size.

The role involves C#, ASP.NET Core, async/await, Entity Framework Core, Git, and optionally Azure DevOps, Docker, and Playwright. You will build backend services, integration layers, and AI API integrations for large-scale websites, apps, and platforms delivered to global brands.

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.

Build production AI agents in Python using Playwright/Puppeteer for browser, voice, and email automation. As the first founding engineer at a fintech that verifies invoices for bank-owned lenders processing $100M+ monthly, you'll own end-to-end features and step into an engineering lead role as the team expands.

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.

Senior Software Engineer works with C#, SQL, .NET Framework 4.8 (ASP.NET MVC5, WebAPI2, EF6), modern .NET 6+, JavaScript/TypeScript, AWS (Lambda, SQS, SNS, RDS) to modernise core C#/SQL systems by extracting legacy business logic, building clean services, and verifying changes via shadow-mode testing.

Modernise legacy C#/SQL payment systems using .NET 6+, .NET Framework 4.8 (ASP.NET MVC5, WebAPI2, EF6), JavaScript/TypeScript, and AWS (Lambda, SQS, SNS, RDS). Extract business rules into tested services, deploy via shadow-mode verification to ensure zero-downtime equivalence. The team modernises core infrastructure handling revenue flows without breaking production.

FDM Group★2.9 (270)· London

Senior .NET developers use C#, .NET 8, ASP.NET Core MVC, CQRS, Domain-Driven Design, Azure DevOps, Git, and CI/CD to build secure web applications and services. The role leads design and delivery for a large-scale Investment Programme platform within the Public Sector, integrating with Dynamics 365 and CRM systems.

Accenture★3.9 (29k)· London

Work daily with JavaScript/TypeScript, Python, Java or C# writing automation scripts and building frameworks; drive adoption of Playwright, MCP, GitHub Copilot and Claude. As a Test Automation Associate Manager at Accenture, you lead and mentor a QE automation engineering team while owning tooling strategy and framework definition across client engagements. You also conduct quality engineering assessments and support QE strategy for client accounts.

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.

You will work with Playwright, JavaScript, TypeScript, automation frameworks and CI/CD pipelines on a strategic front‑office derivatives trading platform, embedded within the bank’s Front Office Derivatives Technology team.

You will design and maintain automated UI, API, and service-level tests in TypeScript using Serenity/JS and Playwright, plus Python/pytest and C#/.NET. The role involves testing the ACE application and internal platform tooling for a decentralised AI platform optimising energy in data centres.

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.

Senior Software QA Engineer at G3D will design automated testing frameworks using Playwright and TypeScript, work with Linux, Kubernetes, CI/CD, and API testing, and test AI-powered functionality on a distributed decision support platform that solves complex real-world problems.