Principal Software Development Engineer in Test (SDET)

Principal Software Developer in Test (SDET)

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

Drive test automation innovation and engineering excellence in financial technology

The Role

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.

What You’ll Do

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

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

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

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

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

What We’re Looking For

• 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

Bonus Points For

• 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

Why Join Capco

• Deliver high-impact technology solutions for Tier 1 financial institutions

• Work in a collaborative, flat, and entrepreneurial consulting culture

• Access continuous learning, training, and industry certifications

• Be part of a team shaping the future of digital financial services

• Help shape the future of digital transformation across FS & Energy.

Benefits 

We offer a competitive, people-first benefits package designed to support every aspect of your life:

• Core Benefits: Discretionary bonus, competitive pension, health insurance, life insurance and critical illness cover. 

• Mental Health: Easy access to CareFirst, Unmind, Aviva consultations, and in-house first aiders. 

• Family-Friendly: Maternity, adoption, shared parental leave, plus paid leave for sickness, pregnancy loss, fertility treatment, menopause, and bereavement. 

• Family Care: 8 complimentary backup care sessions for emergency childcare or elder care. 

• Holiday Flexibility: 5 weeks of annual leave with the option to buy or sell