Java Developer

Java Developer – London | Permanent | On-Site | 4-day Flex Working

Defence, Cyber & Intelligence Programmes | Competitive Benefits

About the Opportunity

A leading defence and cybersecurity organisation is seeking Java Developers at all levels to join their growing team, working across a range of cutting-edge projects in the national security, cyber defence, and intelligence sectors. You’ll play a key role in developing advanced DevSecOps solutions that protect critical digital infrastructure, while benefiting from a strong culture of flexibility, innovation, and continuous learning.

Key Responsibilities

• Plan, conduct and coordinate software development activities through the full lifecycle
• Design, code, test, and debug high-quality software systems
• Collaborate with stakeholders to interpret and deliver customer requirements
• Analyse system capabilities to resolve queries related to program intent, output requirements, input data acquisition, and control techniques
• Develop operating instructions and maintain thorough documentation of programme development
• Support the implementation and maturation of CI/CD pipelines, particularly for cloud-based deployments
• Work within Agile Scrum teams and contribute to continuous improvement initiatives
• Mentor and support junior engineers where appropriate

Essential Skills and Experience

• Proficient in Java (latest versions) and Python
• Strong development experience on Linux platforms
• Knowledge of unit testing and mocking frameworks, particularly JUnit 5.x (Jupiter)
• Familiar with Git version control and GitLab CI/CD pipelines
• Hands-on experience with Agile (Scrum) methodologies
• Database experience with Oracle and/or MongoDB
• Experience using the Atlassian suite : Bitbucket, Jira, and Confluence

Desirable Skills

• Knowledge of Apache NiFi
• Front-end development with React (JavaScript/TypeScript)
• Working knowledge of Elasticsearch and Kibana
• Experience developing for cloud environments, particularly AWS (EC2, EKS, Fargate, IAM, S3, Lambda)
• Understanding of Hibernate ORM
• Experience building microservice or serverless architectures
• Knowledge of migrating on-premise applications to cloud environments

Location and Work Style

• London
• 4-day flex working pattern to support excellent work-life balance.

Security Clearance

Applicants must be eligible for DV/eDV clearance to be considered.

If you're passionate about software innovation, cloud-native architectures, and making a real impact in national security, this is an outstanding opportunity to grow your career.