Senior Java Integration Developer in Sydney

• Senior Java Integration Developer
• Sydney | 100% Onsite | 6 Month Contract | Must Hold Active Baseline Clearance or Higher
• An exciting opportunity is available for a highly experienced

Senior Java Integration Developer to lead the design and delivery of mission critical integration services within a secure government-focused environment.

This is a hands‑on technical leadership role where you will be responsible for designing, developing and supporting a complex integration layer that connects large‑scale digital platforms with government backend systems.

You will work on high‑volume, highly secure services handling sensitive data and will play a key role throughout development, testing, deployment and production support.

Due to the nature of the environment, this position is fully onsite in Sydney and requires an active Australian Government Baseline Clearance or higher (NV1/NV2) .

The Opportunity

As the technical authority for the integration platform, you will lead the design and development of secure Java‑based integration services that facilitate the transformation and exchange of data between enterprise applications and government systems.

You will work closely with architects, delivery teams, government stakeholders and testing teams to ensure solutions are secure, scalable, resilient and compliant with government standards.

Key Responsibilities

• Lead the technical design of enterprise integration solutions
• Develop and maintain Java‑based integration microservices
• Design and implement JSON to SOAP/XML transformations
• Build asynchronous processing capabilities including queuing, retries and failure management
• Deliver secure integrations using mutual TLS, PKI and digital message signing
• Define and maintain interface contracts and schema mappings
• Build test harnesses and integration stubs to accelerate delivery
• Support integration, performance and security testing activities
• Troubleshoot complex issues within secure environments
• Assist with deployment planning, cutover activities, go‑live support and hypercare
• Mentor developers and provide technical leadership across integration initiatives
• Collaborate with architecture, Dev Ops, testing and business stakeholders
• Technical Environment
• Technologies
• Java (Current LTS)
• Spring Boot
• Spring Integration or similar frameworks
• Integration
• SOAP/XML
• WSDL
• XSD
• JAXB
• REST/JSON
• Message Queuing
• Security
• Mutual TLS (m TLS)
• PKI and Certificate Management
• OAuth
• Digital Signatures
• IP Allow Listing
• Platform & Infrastructure
• Kubernetes
• API Gateways
• Ingress Controllers
• Load Balancers
• Containerised Environments
• CI/CD Pipelines
• Data & Monitoring
• Postgre SQL / Maria DB or similar
• Structured Audit Logging
• SIEM Integration
• Application Performance Monitoring (APM)

Essential Skills & Experience

To be successful in this role, you will demonstrate

• Active Australian Government Baseline Clearance or higher (NV1/NV2)
• Availability to commence immediately and no later than
• 1 November 2026
• 12+ years of commercial Java development experience
• Extensive experience delivering enterprise integration solutions at senior or lead level
• Strong expertise designing and building SOAP/XML web services
• Proven experience with WSDL, XSD, schema transformations and JAXB
• Hands‑on delivery of certificate‑based authentication, m TLS and message signing
• Experience building high‑volume, resilient integration platforms
• Strong knowledge of asynchronous processing, queuing and error handling patterns
• Kubernetes and containerised microservices expertise
• Excellent troubleshooting and diagnostic skills across application, infrastructure and networking layers
• Strong stakeholder engagement and communication skills
• Highly Desirable
• Experience integrating with Australian Government agencies
• Knowledge of PSPF, ISM and IRAP frameworks
• Experience within travel, aviation or passenger data environments
• Large‑scale public sector digital service delivery experience
• Performance testing and optimisation of enterprise integration services

What We're Looking For

You are a senior engineer who enjoys owning solutions from design through to production.

You are comfortable operating as the technical lead, making critical decisions and guiding teams through complex delivery challenges.

You bring a pragmatic approach to problem‑solving, work effectively under pressure and have a strong focus on security, quality and operational excellence.

• Important Requirements
• Must hold a current
• Australian Government Baseline Clearance or higher
• Must be able to work onsite in Sydney five days per week
• Remote access to the secure environment is not available
• Must be available to commence immediately, and no later than
• 1 November 2026
• Occasional out‑of‑hours support may be required during releases, cutovers and hypercare periods

Manpower Group is committed to being a Diversity Confident Recruiter and encourages applications from people from a diverse range of backgrounds, including people with a disability.

Please indicate your preferred method of communication in your resume and please let us know if you require any reasonable adjustments should you be contacted for an interview.

Aboriginal and Torres Strait Islander people are encouraged to apply.

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