Principal Software Development Engineer in Test (SDET)

Location: London (Hybrid) | Practice Area: Technology & Engineering | Type: Permanent

As a Principal SDET at Capco, you'll lead the strategy, architecture, and implementation of robust automation testing frameworks across financial services projects. You’ll work closely with cross-functional teams to deliver quality-first solutions using the latest tools and practices. You’ll also mentor engineers, foster best practices in test automation, and help shape our quality engineering capability.

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  Architect reusable, scalable test strategies and frameworks across web and mobile platforms

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  Design, build, and maintain test automation scripts for UI, APIs, and services

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  Integrate testing tools into CI/CD pipelines and manage cloud-based testing solutions

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  Lead test data management, performance/load testing, and accessibility verification

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  Mentor junior engineers and influence organisation-wide testing strategy and tooling

• Strong experience in UI and mobile test automation using Selenium, WebDriver, Cucumber, or Robot

• Proficient in API testing (REST/SOAP) and tools like Postman or JMeter

• Experience with cloud-based test platforms such as BrowserStack, Sauce Labs, or Appium

• Solid understanding of test lifecycle tools such as Jira, Jenkins, GitHub, SonarQube

• Strong knowledge of HTML, JavaScript, CSS, ReST, JSON, and accessibility standards

• Development background and coding experience in Java, Ruby, or Python

• Load and performance testing experience using JMeter, LoadRunner, or Performance Center

• Cloud platform exposure (AWS, Azure, OpenShift, PCF)

• Experience with DevOps practices, Agile methodologies, and AAA accessibility standards

• Experience migrating on-premise systems to cloud ecosystems

We’re committed to making our recruitment process accessible and straightforward for everyone. If you need any adjustments at any stage, just let us know – we’ll be happy to help. We value each person’s unique perspective and contribution. At Capco, we believe that being yourself is your greatest strength. Our #BeYourselfAtWork culture encourages individuality and collaboration – a mindset that shapes how we work with clients and each other every day.

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