A fantastic opportunity has become available for a Software Developer Engineer in Test to join Caristo Diagnostics rapidly growing team. Based in Oxford, you will work in our global data operations team with colleagues in both U.S. and UK.
About Caristo Diagnostics
With the first and only FDA approved (July 29, 2026) coronary artery inflammation diagnostic medical device, CaRi-Heart®, Caristo Diagnostics is a global leader in AI technologies for cardiovascular disease, founded as a spin-out from the University of Oxford in 2018. Caristo also has an FDA approved (2025) coronary artery plaque diagnostic medical device. Its award-winning inflammation technology helps detect hidden heart disease and identify people at risk of a heart attack before symptoms appear allowing for proactive disease management. Working with leading hospitals, research institutions, and pharmaceutical partners, Caristo aims to save lives through early detection and personalized prevention. The company was named a 2026 Technology Pioneer by the World Economic Forum in June 2026. Learn more at www.caristo.com or follow Caristo on LinkedIn, YouTube, and X.
About the CaRi-Heart® Technology
Named first of “7 Technologies That Could Change Heart Healthcare Forevermore” by the Robb Report, the CaRi-Heart® technology is Caristo’s flagship offering which uncovers hidden coronary inflammation, a key driver of cardiovascular disease, on routine Coronary Computed Tomography Angiography (CCTA).
The technology is regulatory approved for clinical use in US, UK, Europe, and Australia and is in use with a growing number of hospitals and clinics. Multiple patents underpinning CaRi-Heart technologies have been granted in major jurisdictions around the world. In addition, exceptional validation results showing CaRi-Heart’s ability to aid the prediction of heart attacks have been published in leading medical journals including the Lancet, JACC, European Heart Journal, and Cardiovascular Research.
Job Title Software Developer Engineer in Test
Department Engineering
Reports To: Lead Test Engineer
Location: Oxford, UK
Responsibilities
• Enhance and extend the existing Python/Selenium/Behave automation framework.
• Evaluate and introduce improvements to increase the test framework reliability, maintainability and execution speed.
• Refactor and optimise existing automated tests for stability and maintainability.
• Increase automation coverage to reduce reliance on manual testing.
• Develop reusable automation utilities and libraries.
• Implement coding standards and best practices for automation.
• Maintain comprehensive documentation for the automation framework.
• Training and mentoring junior members of the team.
• Promote automation-first thinking within the testing team.
• Compliance with the MDD/MDR and ISO 13485/62304 standards for validation and verification of software medical devices.
Skills & Experience Required:
Essential
• Strong Python programming skills, including object-oriented programming and clean code principles.
• Experience developing and maintaining test automation frameworks using known browser automation framework (e.g Selenium or Playwright) and BDD (e.g. Behave).
• Solid understanding of the Page Object Model (POM) and other automation design patterns.
• API test automation using tools and libraries such as requests or similar.
• Experience writing maintainable, reusable, and scalable automated test suites.
• Familiarity with version control systems (Git).
• Experience working with CI/CD pipelines (e.g. GitLab CI).
• Ability to troubleshoot and resolve flaky or unstable automated tests.
• Experience with logging, reporting, and test result analysis.
• Strong analytical and problem-solving skills.
Desirable
• Experience integrating automated tests into deployment pipelines
• Knowledge of Linux command line
• Experience with containerisation (Docker)
• Familiarity with cloud platforms (AWS)
• Experience with test reporting tools such as Allure
• Understanding of test data management and environment configuration.
