Melbourne, Australia | Posted on 21/04/2026
Location: Capital city locations in ACT, VIC, NSW, QLD or SA
Working Arrangement: Hybrid (initial 6 weeks full‐time onsite, then minimum 3 days per week onsite)
Security Clearance: Must have Negative Vetting Level 1 (NV1)
About the Role
Services Australia is seeking an experienced Senior Application Systems Engineer to support, administer, and enhance a range of commercial-off-the-shelf (COTS) and bespoke ICT solutions. The role supports business‐critical digital services and applications built primarily on the Microsoft .NET technology stack, operating within a complex, highly regulated government environment.
The successful candidate will play a key role in ensuring the stability, security, availability, and performance of applications across web, desktop, web services, and batch processing platforms.
Key Responsibilities
Application Support & Administration
* Provide ongoing technical support and administration for corporate web and desktop applications
* Support .NET‐based applications, including IIS-hosted services, Windows services, web services/APIs, and scheduled batch jobs
* Maintain and administer application environments across development, test, and production
Incident & Problem Management
* Diagnose and resolve complex system and application issues
* Participate in incident response, investigation, and root cause analysis
* Contribute to the resolution of problems to improve system stability and reliability
Patching, Maintenance & Enhancements
* Plan, test, and execute application and infrastructure patching activities
* Ensure systems comply with security, risk, and regulatory requirements
* Support the delivery of minor system enhancements and operational improvements
* Work collaboratively with infrastructure, networking, and security teams
* Support physical, virtualised, and hybrid infrastructure environments underpinning application services
* Assist with lifecycle activities, including upgrades and retirement of legacy components
Documentation & Operational Readiness
* Develop, maintain, and review:
o Technical documentation
o Standard Operating Procedures (SOPs)
o Support and operational runbooks
* Ensure documentation supports audit, compliance, and knowledge transfer requirements
Required Skills and Experience
* Extensive experience supporting enterprise applications built on the Microsoft .NET technology stack
* Strong experience in:
o Windows Server environments
o IIS application hosting
o Web services and batch processing
* Demonstrated experience in incident, problem, and change managementProven ability to operate in high‐availability, security‐conscious environments
* Strong analytical and troubleshooting skills
* Excellent written and verbal communication skills
* Experience within Australian Government or other large, regulated environments
* Familiarity with government security policies and compliance frameworks
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