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 Chance 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, DevOps, 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 (mTLS)

PKI and Certificate Management

TLS 1.2+

OAuth

Digital Signatures

IP Allow Listing

Platform & Infrastructure

Kubernetes

API Gateways

Ingress Controllers

Load Balancers

Containerised Environments

CI/CD Pipelines

Data & Monitoring

PostgreSQL / MariaDB 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, mTLS 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

ManpowerGroup 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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