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Senior QA Test Engineer C# API Performance Testing

Job in Reigate, Surrey County, RH2, England, UK
Listing for: Client Server
Full Time, Part Time position
Listed on 2026-02-17
Job specializations:
  • Software Development
Salary/Wage Range or Industry Benchmark: 85000 GBP Yearly GBP 85000.00 YEAR
Job Description & How to Apply Below
Senior QA Test Engineer C# API Performance Testing Senior QA Test Engineer C# API Performance Testing

1 week ago Be among the first 25 applicants

This range is provided by Client Server. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.

Base pay range

Direct message the job poster from Client Server


Senior QA Test Engineer (C# API Performance Testing) Reigate / WFH to £85k

Do you enjoy breaking things and putting them back together to discover how they work?

You could be progressing your career, in a senior, hands-on role working on complex and technically challenging systems with continual learning opportunities a global Fin Tech.

As a Senior QA Test Engineer you'll collaborate with a small, Agile team to define test strategies for features or whole applications; you'll establish test environments and frameworks and work with software developers to achieve high levels of test automation with a focus on complex backend C#, API and Performance Testing (JMeter).

You'll work end-to-end, liaising with the Product Owner to define User Stories, through to executing manual and automation tests, performing exploratory testing and investigating new tools and processes.

Location / WFH:

There's a hybrid work from model, you can work from most of the week, meeting up with colleagues in Reigate 1-2 days a week in modern, open plan offices within a five minute walk of the station; there's a smart casual dress code and a good work / life balance.

About you:

  • You're a skilled Test Automation Engineer with the ability to understand complex software products and work out how to test them
  • You have a strong knowledge of C#, including basic coding skills
  • You have a good knowledge of Performance Testing (ideally with JMeter), Exploratory Testing, Manual Testing and Test Automation
  • You have a good understanding of SaaS
  • You have end-to-end testing experience
  • You enjoy problem solving and collaborating as part of a cross functional Agile team
  • You believe in automating wherever possible

What's in it for you:

As a Senior QA Test Engineer (C# API Performance Testing) you will earn a competitive package including:

  • Salary to £85k + bonus (c 15%)
  • 25 days holiday (and ability to buy more)
  • Enhanced maternity / paternity packages
  • Continuous training and career development opportunities
  • Plus a range of other perks and discounts

Apply now to find out more about this Senior QA Test Engineer (C# API Performance Testing) opportunity.

At Client Server we believe in a diverse workplace that allows people to play to their strengths and continually learn. We're an equal opportunities employer whose people come from all walks of life and will never discriminate based on race, colour, religion, sex, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. The clients we work with share our values.

Seniority

level
  • Seniority level

    Mid-Senior level
Employment type
  • Employment type

    Full-time
Job function
  • Job function

    Engineering, Information Technology, and Quality Assurance
  • Industries Software Development, Technology, Information and Media, and Financial Services

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Position Requirements
10+ Years work experience
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