Principal Backend Engineer - Java

Capco; London; Hybrid; GBP 70,000 - 100,000; Full time

Job summary

A leading technology consultancy in financial services is seeking a Principal Backend Engineer with advanced Java skills. The successful candidate will work on high-impact projects in a collaborative environment, leveraging cloud-native technologies and innovative solutions. Opportunity for growth and continued learning are key components of this role at Capco, where employee wellbeing is prioritized.

Benefits

Discretionary bonus

Competitive pension

Health insurance

Life insurance

Maternity and adoption leave

Mental health support services

Paid leave for fertility treatment and pregnancy loss

Flexible annual leave

40 hours of training annually

Access to gym and travel insurance

Qualifications

• Expertise in Java 11, 17 and above.
• Experience with enterprise level software deployment in cloud environments.
• Strong understanding of CI/CD pipelines and microservices architecture.

Responsibilities

• Build scalable backend services using Java.
• Design and implement APIs and microservices.
• Develop testing strategies and collaborate within agile teams.

Skills

Java Development

Spring Boot

Cloud Services

Architecture Patterns

CI/CD

Database Management

Message Brokers

Testing

Java Streaming

Infrastructure as Code

Large-Scale Systems Design

Distributed Systems Troubleshooting

Education

Bachelor's degree in Computer Science or related field

Tools

AWS

Gitlab

Job description

Principal Backend Engineer - Java at Capco

Location: London (Hybrid) | Type: Permanent

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. 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 backend 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

What We’re Looking For

• 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.

Why Join Capco

You’ll be part of a team where your voice matters. We’re collaborative, non-hierarchical, and laser-focused on creating impact – for our clients and for you. At Capco, you’ll shape your career around your strengths, enjoy flexibility and trust, and work with people who genuinely care about your growth and wellbeing.

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:Minimum 40 Hours of Training Annually: Take your pick—workshops, certifications, e-learning—your growth, your way. 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 a barrier-free, inclusive recruitment process. If you need any adjustments at any stage, just let us know – we’ll be happy to help. We welcome applicants from all backgrounds. At Capco, we value the difference you make, and the differences that make you. Our #BeYourselfAtWork culture champions diversity, equity and inclusivity, and we bring a collaborative mindset to our partnerships with clients and colleagues. #BeYourselfAtWork is the cornerstone of our success and a value that our employees live and breathe every day.

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