Senior Java Developer

Senior Java Developer x2 – Cloud-Native / Event-Driven Systems | Public Sector | Up to £470/day (Inside IR35)

We're hiring 2x Senior Software Engineers to join a major UK public sector programme, building cloud-native, event-driven services that support critical national digital infrastructure.

You'll work alongside Technical Architects, Data Engineers and Product teams to design and deliver secure, scalable APIs and event-driven services — helping raise engineering standards while supporting and evolving existing live systems.

Location: Leeds, Sheffield or London (hybrid — travel flexibility dependent on team)

Clearance: Active SC clearance required, or strong confidence of obtaining it

Essential: Prior experience working within UK Government or wider public sector is required

What you'll be doing:

• Designing and building secure, scalable cloud-native services and REST APIs
• Developing event-driven architectures using asynchronous messaging patterns
• Designing and implementing microservices within AWS
• Building integrations across operational systems via APIs and event-based architectures
• Applying Domain Driven Design (DDD) and modern software design patterns
• Developing secure services using OAuth2, JWT and related standards
• Translating business requirements into maintainable technical solutions
• Designing for observability, resilience and operational support
• Building reusable components and engineering patterns to promote consistency

What we’re looking for:

• Strong production experience across at least two of the following: Java, Kotlin, Go
• Strong experience building RESTful APIs (Spring Boot or equivalent)
• Experience with event-driven systems (Kafka, SNS/SQS, EventBridge)
• Solid grounding in automated testing, CI/CD, code review and version control
• Cloud-native development experience within AWS
• Experience with Infrastructure as Code
• Experience working in agile, multidisciplinary delivery teams
• Strong communication skills — technical and non-technical stakeholders
• Previous UK Government or public sector experience essential

Nice to have:

• Experience with telemetry, IoT or event streaming platforms
• Experience with geospatial or location-based systems

If you're an experienced engineer confident across two or more of Java, Kotlin and Go, with a public sector background and active or eligible SC clearance, get in touch or drop me a message to find out more.

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