Principal Backend Engineer - Java

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.

The Role

Capco is growing our Engineering team, and we’re looking for experienced Principal Backend Engineers with strong Java skills and a passion for delivering innovative solutions in financial services.

As a Principal Backend Engineer at Capco, you’ll contribute to high-impact, client-facing projects and work with cloud-native technologies across different domains within Financial Services & Energy. You’ll collaborate with talented engineers, contribute to architecture and engineering decisions, and have access to industry-leading learning and development opportunities.

You’ll also use approved AI tools, automation and AI-enabled engineering workflows where appropriate to improve development speed, quality and productivity, while applying human judgement, responsible AI guardrails and appropriate review.

What You’ll Do

• 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.

What We’re Looking For

• 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.

Bonus Points For

• 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.

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