Principal Software Development Engineer in Test (SDET)
UK – London
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
Solid understanding of test lifecycle tools such as Jira, Jenkins, GitHub, SonarQube
Bonus Points For
Development background and coding experience in Java, Ruby, or Python
Load and performance testing experience using JMeter, LoadRunner, or Performance Center
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.
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 holiday days based on your needs.
- Continuous Learning:Your growth, your way – minimum 40 hours of training annually. Take your pick; workshops, certifications, e-learning. Also, Business Coach assigned from Day One: Get one-on-one guidance to fast-track your goals and accelerate your development.
- Extra Perks:Gympass(Wellhub), travel insurance, Tastecard, season ticket loans, Cycle to Work, and dental insurance.
Inclusion at Capco
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.
Capco does not and shall notdiscriminateon the basis of race, color, religion (creed), gender, gender expression, age, national origin (ancestry), disability, marital status, sexual orientation, or military status, in any of its activities or operations. In order to track the effectiveness of our recruiting efforts, please consider participating in the optional questionnaire.
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