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# Principal Backend Engineer - Java

- **Company:** Capco
- **Location:** London, UK
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Amazon Web Services, Architectural Patterns, Automation of Tests, Cloud Engineering, Code Coverage, Continuous Integration, Command-Query Responsibility Segregation (Software Development), Distributed Systems, Identity and Access Management, Message Broker, NoSQL, Cloud Services, SQL Databases, Data Streaming, Performance Testing, Spring-boot, Backend, Gitlab, Cloudformation, Apache Kafka, Cucumber (Software), Microservices
- **Published:** October 12, 2026
- **Apply:** https://www.careerboard.com/gb/en/find-jobs-in-United-Kingdom/-E5238517B593869462/

## About the Role

* Java Development - Expertise in Java 11, 17 and above.
 * Spring Boot - Proficiency with the Spring Boot framework.
 * Cloud Services - Deep understanding of deploying enterprise level software into any public cloud, preferably AWS.
 * Architecture Patterns - Experience implementing microservices, event-driven, CQRS and cloud-native architectures.
 * CI/CD - Strong understanding of CI/CD pipelines, particularly within the AWS ecosystem.
 * Database Management - Proficiency in both SQL and NoSQL databases.
 * Message Brokers - Experience with Kafka.
 * Testing - Ability to write various types of tests including unit, component, integration, end-to-end, and performance tests.
 * Java Streaming - Core understanding of Java streaming and AWS integration.
 * Infrastructure as Code - Experience with CloudFormation or similar tools for infrastructure management.
 * Large-Scale Systems Design - Experience with designing large-scale systems.
 * Distributed Systems Troubleshooting - Ability to troubleshoot distributed systems.

Bonus Points For

 * An appetite to contribute to the wider Capco business outside of project assignments. This can be achieved through various means including thought leadership activities, supporting RFP's and the coaching/mentoring of more junior engineering team members
 * Proficiency with Gitlab for CI/CD processes.
 * Behaviour Driven Design - Experience writing automation test cases in Cucumber using Behaviour Driven Design (BDD).
 * AWS Certified Solutions Architect - Associate or Professional level certification required.
 * Security Best Practices - Strong knowledge of security best practices, including the use of IAM Roles, KMS, etc.

## Description

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. If you enjoy solving complex problems, working with cloud-native technologies, and collaborating in agile teams, we'd love to hear from you.

As a Principal Backend Engineer at Capco, you'll contribute to high-impact, client-facing projects that shape the future of financial services. You'll work alongside talented engineers, have access to industry-leading training, and get the opportunity to grow your skills across multiple platforms. You will also get the chance to work across different domains within FS & Energy.

What You'll Do

 * Build and deliver scalable Back End services using Java (11, 17+)
 * Design and implement APIs and microservices for enterprise systems
 * Work across cloud platforms, particularly AWS, using best practice deployment techniques
 * Contribute to architecture discussions and solution design
 * Develop robust test coverage including unit, integration, and performance testing
 * Collaborate in agile teams alongside clients, product managers, and other engineers