Principal Backend Engineer - Java

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.

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  Build and deliver scalable backend services using Java 11, 17+, designing APIs and microservices for enterprise systems.

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  Work across cloud platforms, particularly AWS, applying cloud-native deployment techniques and contributing to architecture and solution design.

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  Develop robust automated test coverage across unit, component, integration, end-to-end and performance testing.

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  Collaborate with clients, product managers and engineers in agile teams to design, deliver and troubleshoot large-scale distributed systems.

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  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.

• 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.

• 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.