We're seeking an experienced Principal Java/Bespoke Software Engineer to join a high-performing technology team supporting a mission-critical operational platform.
About the Agency
Our client is a large Federal Government agency delivering critical services to Australians.
The organisation operates complex enterprise systems and invests heavily in modern technology platforms to support nationally significant operations.
Key Responsibilities
As a Principal Engineer, you'll play a key role in the ongoing support, maintenance and enhancement of a complex enterprise application environment.
Working alongside highly skilled developers and subject matter experts, you will contribute to the design, development and operation of business-critical solutions across Java, AWS and Oracle technologies.
Developing and maintaining enterprise-grade Java applications and integrations
Designing and implementing scalable cloud-based solutions using AWS
Supporting Oracle database development, integration and optimisation
Contributing to DevOps, CI/CD and release management activities
Producing technical documentation and providing expert technical advice
Participating in a shared on-call support roster for critical applications
About You




You are a senior software engineering qualified with extensive experience delivering complex enterprise solutions in large-scale environments.
You enjoy solving challenging technical problems and are comfortable operating as both a hands-on developer and trusted technical adviser.
You will bring:
Min 8 years Java experience, enterprise design patterns, JPA, Hibernate ORM, JEE an advantage, reactive programming an advantage.
Java Web service development, SOAP and REST APIs, OpenAPI/XSD Schemas, XML/JSON, Spring/SpringBoot.
Experience with AWS services such such as EC2, Lambda, API Gateway, S3 and SQS
Strong Oracle database and PL/SQL capability
Experience with REST and SOAP integrations, OpenAPI and enterprise messaging
Working knowledge of Jenkins, Git, Maven and DevOps practices
Willingness to be 24x7 on-call (rare, approx. once per year).
Excellent written and verbal communication skills
MUST HAVE Australian Citizenship
and Baseline Security Clearance
If you're looking for a long-term opportunity where your work will genuinely make a difference, we'd love to hear from you.
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📌 Principal Java/Bespoke Software Engineer (Developer) (Canberra)
🏢 On Q Recruitment
📍 Canberra