Software Engineer in Test in Leatherhead

4Square Recruitment Ltd provided pay range

This range is provided by 4Square Recruitment Ltd. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.

Base pay range

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Software Development Engineer in Test (SDET)

Location: Hybrid – 4 days in the Leatherhead office, 1 day from home

Job Type: Full-time

The Role

We’re hiring a Software Development Engineer in Test (SDET) to design, build and maintain automation frameworks that ensure the performance, reliability, and stability of our applications. You’ll combine strong software engineering skills with a quality-led mindset to advance our automation strategy and influence how the engineering team delivers high-quality software.

Key Responsibilities

• Develop and maintain robust automation frameworks for UI, API, and backend testing.
• Build automated test suites integrated with CI/CD pipelines.
• Enhance tools, libraries and utilities that support reliable and scalable automation.

Quality Engineering

• Apply structured test design, coverage analysis, and preventative quality techniques.
• Work closely with developers to embed testability into code and architecture.
• Drive improvements through root-cause analysis and continuous refinement of processes.

Testing & Validation

• Write and execute automated and occasional manual test cases.
• Validate functional and non-functional behaviour, including performance and regression areas.
• Participate in code reviews with a focus on quality, performance and maintainability.
• Partner with engineering and product teams to define requirements and acceptance criteria.
• Champion best practices in automation and contribute toward a shift-left testing approach.
• Mentor colleagues on tools, frameworks and automation methods.

Required Skills & Experience

• Degree in Computer Science, Engineering or equivalent experience.
• Experience building automation frameworks using Selenium, Playwright, Cypress, JUnit/TestNG.
• Solid understanding of unit, integration, system, and regression testing.
• Hands-on experience with API testing tools (Postman, REST Assured) and performance tools (JMeter, Gatling).
• Familiarity with CI/CD systems (Bitbucket, Jenkins, TeamCity) and containerisation (Docker, Kubernetes).
• Proficiency with Git and modern version-control practices.
• Experience with cloud platforms (AWS preferred).
• Understanding of microservices, distributed systems, and event-driven architecture.
• Experience with contract testing frameworks such as Pact.
• Familiarity with observability tools (Prometheus, Grafana, Datadog).
• Background in performance optimisation and scalability testing.
• Exposure to security testing or DevSecOps practices.

Soft Skills

• Strong analytical and problem-solving capabilities.
• Excellent communication and team collaboration skills.
• Comfortable working both independently and within an agile environment.
• Motivated by continual learning and driving improvements in product quality.

Seniority level

Not Applicable

Employment type

Full-time

Job function

Information Technology