8 of 8 API Testing Jobs in East London

and products are rigorously tested, delivering ex ceptional quality, performance, and reliability across both desktop and web applications. Initially the role will be split between 80% Manual & 20% Automation Testing but what they want this person to do is help gradually move the company across to a more automated environment. What You’ll Be Doing: Design, develop, and execute … automated & manual tests for AI and non-AI systems using C# Perform end-to-end, API, UI/UX, performance, security, and regression testing. Contribute to software quality improvements & code reviews Continuously improve testing processes, implementing new tools & automation techniques Work closely with fellow Engineers/Stakeholder s to align on test strategies and outcomes Gain exposure to … AI/LLM model testing, ensuring accuracy and performance What We’re Looking For: 3+ years’ experience in manual & automation testing for desktop and/or web applications Proficiency in C# or Python to develop and maintain automated test suites Experience with Desktop Applications (Windows) Experience in software QA methodologies, and API testing specifically Familiarity with More ❯

organisation dedicated to supporting established SMEs, a critically underserved segment in the financial sector. As part of a cutting-edge technology team, you’ll contribute to building robust, automated testing frameworks that ensure the reliability of solutions. What you’ll be doing: Design, develop, and execute automated tests to validate software functionality, performance, and reliability, leveraging modern tools and … management systems, collaborating with developers to drive timely resolution and continuous improvement Main Skills/Requirements: Hands-on experience in test automation with a strong focus on integration and API testing Proven expertise in non-functional test automation, including performance, load, and stress testing Proficient in using various test automation frameworks and tools across different environments Solid … experience with Microsoft Azure, including testing cloud-native applications and services How you’ll be rewarded: Bonus! Hybrid Working Pension Work with cutting edge technologies Opportunity to work for a recognised company This is an excellent opportunity for an experienced Test Automation Engineer to join a leading company, that are driven towards success! For further information on this Test More ❯

SDET to join their team. Key Responsibilities: Lead and manage a small team of SDETs, including recruitment and onboarding Mentor junior and senior SDETs to grow their technical and testing capabilities Drive test automation strategies and team planning for complex software systems Collaborate cross-functionally to document and maintain scalable automation frameworks Advocate Agile best practices throughout the development … lifecycle Provide training sessions on automation tools, frameworks, and testing methodologies Technical Requirements: Strong coding skills in Java Hands-on experience with: Selenium WebDriver for UI automation JMeter for performance testing RESTful APIs testing Agile/Scrum methodologies ✅ What You Bring: Proven experience leading/managing small technical teams Strong background in automation testing and test More ❯

basis for an initial 6 months, with a potential to extend further. About the Role Working within the Borders business unit, The ideal candidate will have experience in performance testing of UI, APIs, and messaging systems, with strong hands-on expertise in LoadRunner Suite, Azure/Jenkins pipelines, and Postman. This role will focus on ensuring the performance, scalability … applications. Key Duties: • Design and execute performance test plans for UI, APIs, and messaging systems • Use LoadRunner Suite and other tools to simulate load and analyse performance • Run performance testing pipelines using Azure DevOps or Jenkins • Use Postman for API validation as part of performance testing flows • Identify bottlenecks and diagnose performance issues in complex systems • Collaborate … analysis and improvement suggestions What we are looking for Required Skills and Experience: • Strong experience with LoadRunner Suite • Proficiency with Azure DevOps or Jenkins pipelines • Experience using Postman for API testing • Solid understanding of performance testing across UI, APIs, and messaging systems • Hands-on experience with Single Page Applications (Angular) • Skilled in performance issue diagnosis and troubleshooting More ❯

/2025 Location: Knutsford/Northampton/London, hybrid 2/3 days onsite Key Skills/requirements Previous experience as a Automation Tester (Open Banking/Payment API) API Automation Tester OR Payments SME required with extensive experience in full stack engineering, test automation Understanding of IT systems and functioning Must demonstrate effective communication with management, peers …/Java Skills Karate/Selenium/Cucumber/Stash/GIT - Automation skills/Lead Teams using these tools CA Lisa/Rest Assured – Exposure to/Experience API testing teams Working with Agile Methodologies/Understanding of Dev Ops Tools All profiles will be reviewed against the required skills and experience. Due to the high number More ❯

maintainability. Core Skills for the Python Software Engineer, Python, AWS | Python, TDD & BDD, Monitoring | £650 - 750pd Outside IR35 | 6-month contract | Fully Remote (UK) Strong Python expertise, especially for API development and testing in cloud environments (preferably AWS). Solid experience with cloud platforms (AWS, Azure, GCP), containerization, automation, and orchestration tools. Familiar with CI/CD pipelines More ❯

maintainability. Core Skills for the Python Software Engineer, Python, AWS | Python, TDD & BDD, Monitoring | £650 - 750pd Outside IR35 | 6-month contract | Fully Remote (UK) Strong Python expertise, especially for API development and testing in cloud environments (preferably AWS). Solid experience with cloud platforms (AWS, Azure, GCP), containerization, automation, and orchestration tools. Familiar with CI/CD pipelines More ❯

growing FinTech, building cutting edge trading platforms for hedge funds and investment managers around the world. In London, they’re looking for an Application Security Engineer, with strong Penetration Testing experience, to join them. This is an initial 6 month contract, hybrid working (3 days a week in the office), outside IR35 and paying ~£550 - £600 per day. This … of a security -focused transformation and you’ll be responsible for identifying and mitigating security vulnerabilities, and risk, within their applications. You’ll focus on building security tools, penetration testing and performing security assessments, whilst updating internal security processes and documentation in the process. Required: Strong experience as an App Sec Engineer Extensive experience of Penetration Testing Hands … Metasploit Capable of designing Security policies, procedures and best practices The ability to investigate and respond to Security related incidents within applications, and work closely with Dev teams throughout API Testing experience (with the likes of REST and Postman) would be ideal More ❯