Principal Backend Engineer - Java

About the Position

Principal Backend Engineer – Java

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

Build scalable backend solutions that help shape the future of financial services.

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Responsibilities

• Build and deliver scalable backend services using Java 11, 17+, designing APIs and microservices for enterprise systems.
• Work across cloud platforms, particularly AWS, applying cloud-native deployment techniques and contributing to architecture and solution design.
• Develop robust automated test coverage across unit, component, integration, end-to-end, and performance testing.
• Collaborate with clients, product managers, and engineers in agile teams to design, deliver, and troubleshoot large-scale distributed systems.
• Use approved AI tools, automation, and AI-enabled workflows to support engineering activities such as development, testing, troubleshooting, and documentation, with appropriate human review and responsible AI controls.

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Requirements

• Expertise in Java 11, 17+, and Spring Boot, with experience designing and delivering large-scale enterprise backend systems.
• Experience with cloud-native and distributed architectures, including microservices, event-driven patterns, and CQRS, preferably deployed within AWS.
• Experience with CI/CD, Infrastructure as Code such as CloudFormation, and SQL and NoSQL databases.
• Experience with Kafka, Java streaming, automated testing, and troubleshooting distributed systems.
• Curiosity and practical experience using approved AI, GenAI, or AI-enabled development tools to improve engineering productivity, with an understanding of human-in-the-loop review, responsible AI, guardrails, and escalation where required.

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Nice to Have

• An appetite to contribute to the wider Capco business through activities such as thought leadership, supporting RFPs, and coaching or mentoring engineering colleagues.
• Proficiency with GitLab for CI/CD processes and experience writing automation test cases in Cucumber using Behaviour Driven Development (BDD).
• AWS Certified Solutions Architect – Associate or Professional level certification.
• Knowledge of security best practices, including IAM Roles and KMS.
• Experience exploring responsible AI-enabled engineering practices, including automation or Agentic AI workflows, while maintaining appropriate review, auditability, and human oversight.

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We Offer

• 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:

• 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 from workshops, certifications, and e-learning. Plus, a Business Coach assigned from Day One provides one-to-one guidance to support your goals and accelerate your development.
• Healthcare Access: Convenient online GP services.
• Extra Perks: Gympass (Wellhub), travel insurance, Tastecard, season ticket loans, Cycle to Work, and dental insurance.

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About the Company

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.

#LI-DNI