Role & seniority: Senior Test Engineer (lead quality function for customer-facing web/front-end apps)

Stack/tools: Playwright; C# / .NET; HTML/CSS/JavaScript; API testing (Postman or similar); CI/CD (Azure DevOps, GitHub Actions)

Top 3 responsibilities

Design, build, and maintain automated test frameworks; own end-to-end QA from planning to release sign-off
Lead manual and automated testing across web/front-end apps; establish standards, processes, and best practices
Integrate tests into CI/CD; collaborate with developers/product managers; mentor junior testers

Must-have skills

Hands-on manual and automation testing experience; Playwright experience preferred
Strong C# / .NET scripting; testing modern web apps; API testing
SQL for data validation/test setup; Agile environment experience; CI/CD integration

Nice-to-haves

Experience building frameworks from scratch; test planning/documentation; shift-left/testing culture advocacy
Mentoring or supporting junior testers; regression, exploratory, negative, and boundary testing
Location & work type: Remote work; fast-paced scale-up environment; full-time role (salary up to £80,000 + benefits)

Full Description

Senior Test Engineer

Salary: Up to £80,000 + benefits

Location: Remote

I'm working with a fast-growing SME who are accelerating the resale and recommerce industry. The company offer an end-to-end solution that combines modern technology, smart data, and expert valuation to create a seamless, customer-first marketplace experience.

As the Senior Test Engineer, you will own and build the quality function across their customer-facing websites and front-end applications. You will define the testing foundations, implement modern automation practices, and embed a quality-first mindset across the engineering team.

Responsibilities as a Senior Test Engineer

Design, build, and maintain automated test frameworks using Playwright and C#.
Lead both manual and automated testing across web and front-end applications.
Establish testing standards, processes, and best practices from the ground up.
Own end-to-end quality assurance from planning through to release sign-off.
Integrate automated tests into CI/CD pipelines (Azure DevOps, GitHub Actions).
Conduct regression, exploratory, negative, and boundary testing.
Collaborate with developers and product managers to define acceptance criteria and test strategies.
Create and maintain clear test plans, test cases, and defect documentation.
Support and mentor junior testers as the team grows.
Champion shift-left testing and continuous improvement across the engineering function.

Requirements for the Senior Test Engineer

Strong experience in both manual and automation testing.
Hands-on experience building automation frameworks using Playwright (preferred).
Strong scripting ability in C# / .NET.
Experience testing modern web applications (HTML, CSS, JavaScript).
Experience with API testing tools such as Postman or similar.
Understanding of SQL for data validation and test setup.
Experience working within Agile environments.
Hands-on experience integrating tests within CI/CD pipelines.
Confidence performing negative and boundary testing.
Ability to operate in a fast-paced, scale-up environment where processes are still being refined.
Experience mentoring or supporting junior testers is highly desirable.

If you are a Senior Test Engineer who enjoys building frameworks from scratch, raising quality standards, mentoring others, and creating robust automation foundations in a growing tech business, this role is for you.