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Senior Software Engineer in Test; SDET

Job in City Of London, Central London, Greater London, England, UK
Listing for: Hargreaves Lansdown
Full Time position
Listed on 2026-07-19
Job specializations:
  • Software Development
    Software Testing, Software Engineer, React.js, Full Stack Developer
Salary/Wage Range or Industry Benchmark: 55000 - 75000 GBP Yearly GBP 55000.00 75000.00 YEAR
Job Description & How to Apply Below
Position: Senior Software Engineer in Test (SDET)
Location: City Of London

We are looking for a highly skilled Software Development Engineer in Test (SDET) to join our cross‑platform engineering team. In this role, you will work closely with React Native mobile developers and React web engineers to build and maintain a world‑class automation framework spanning both mobile and web tech stacks. You'll be responsible for ensuring high-quality releases through robust automated testing, tooling, and engineering excellence.

What

You'll Do
  • Design, develop, and maintain automated test suites for web tech stack
  • Implement test frameworks and CI workflows to improve coverage and execution reliability.
  • Partner with developers to define test strategy, acceptance criteria, and quality gates for new features.
  • Build reusable components and abstractions to keep automation code clean, maintainable, and scalable.
  • Conduct code reviews for automation contributions to ensure best practices.
  • Build and maintain test coverage for shared business logic for React platform.
  • Reduce test cycle time and improve test stability.
What We’re Looking For
  • Solid understanding of React architecture & debugging tools.
  • Experience with REST APIs or GraphQL.
  • Experience with CI/CD pipelines
  • Excellent communication skills and experience working in agile environments.
Nice to Have
  • Experience in fintech or banking applications.
  • Familiarity with micro-frontend architecture.
  • Experience working with feature flags.
  • Familiarity with accessibility testing tooling.
Interview Process Stage 1 - Screening interview (30 mins)

A brief conversation to review your experience, understand your approach to quality, and assess overall role fit.

Stage 2 - Technical take home exercise (1 week)

A take home technical test where you'll be asked to implement automated tests for an existing React application to ensure its quality.

Stage 3 - Technical interview (90 mins)

We will go over your submitted take home exercise to get a better understanding of how you solve problems, also we ask some behavioural questions to make sure you're a good fit for our team and company culuture.

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Position Requirements
10+ Years work experience
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