Senior Test Engineer / QA Automation Engineer / SDET

Senior Test Engineer – Wholesale Transformation

Hybrid | Leeds or Manchester

At Cox Automotive, we're transforming the technology that powers the UK's leading vehicle remarketing and auction services. We're looking for a Senior Test Engineer to help drive quality across our Manheim Auctions Platform and wider Wholesale Transformation initiatives.

If you're passionate about automation, quality engineering, and building reliable, scalable solutions within Agile teams, we'd love to hear from you.

The Role

As a Senior Test Engineer, you'll play a key role in ensuring the quality, performance, and reliability of business-critical software products. Working closely with developers, product managers, and delivery teams, you'll design and implement robust test strategies, build automated test solutions, and help embed quality throughout the software development lifecycle.

This is an opportunity to make a genuine impact within a collaborative engineering environment where continuous improvement, innovation, and technical excellence are highly valued.

What You'll Be Doing

• Designing and implementing comprehensive test strategies and automation frameworks.
• Creating and maintaining automated tests for web applications, APIs, and integrated systems.
• Performing exploratory, functional, regression, and performance testing.
• Collaborating with cross-functional Agile teams to ensure quality is embedded from the outset.
• Identifying, investigating, and helping resolve defects quickly and effectively.
• Driving improvements in test automation practices, tools, and processes.
• Supporting and mentoring less experienced test engineers.

What We're Looking For

Essential Skills & Experience

• Proven experience in a Senior Test Engineer, QA Automation Engineer, or SDET role.
• Strong automation testing experience using Playwright, Cypress, or similar frameworks.
• Commercial experience with C# and automated test development.
• Experience testing APIs using tools such as Postman, SoapUI, or RestSharp.
• Knowledge of Docker, Git, and CI/CD principles.
• Experience working within Agile Scrum teams.
• Exposure to cloud platforms such as AWS or Azure.
• Strong stakeholder communication and collaboration skills.

Desirable

• Performance testing experience using K6.
• Database testing experience.
• Experience supporting complex integration projects.
• Knowledge of risk-based testing approaches.

Why Join Us?

You'll be part of a talented Product Engineering team responsible for systems that support hundreds of vehicle transactions every day across the UK. Our culture encourages collaboration, innovation, continuous learning, and professional growth, giving you the opportunity to work on meaningful technology transformation programmes while advancing your own career.

Ready to Apply?

If you're an experienced automation-focused test professional looking for your next challenge in a modern engineering environment, we'd love to hear from you.

Apply now and help shape the future of digital automotive retailing.