Lead systems developer new

About the Opportunity

Our government client is seeking a highly experienced Lead Systems Developer to support the maintenance, enhancement, and stabilisation of a complex, business‐critical legacy system. You will play a key role in ensuring ongoing system reliability while contributing to modern development practices, vendor knowledge transition, and operational improvements. This is a hands‐on role suited to a senior developer who can balance application development, system support, and continuous improvement in a dynamic environment.

Key Responsibilities

• Lead development, maintenance, troubleshooting, and enhancement of a legacy .NET application and associated components
• Design and develop solutions using C#, .NET/.NET Core, ASP.NET, APIs, and batch processing frameworks
• Develop and maintain database components including SQL scripts, stored procedures, views, functions, and reporting datasets
• Diagnose and resolve complex production issues, including system defects, performance problems, integration failures, and data inconsistencies
• Develop, maintain, and support system integrations such as APIs, scheduled jobs, and data exchange processes
• Participate in vendor knowledge transfer by reviewing code, documentation, and operational procedures, and applying this knowledge through hands‐on work
• Produce and maintain technical documentation including deployment guides, troubleshooting materials, and operational runbooks
• Implement technical changes in line with architecture standards, security requirements, and release management processes
• Support controlled software releases using Azure DevOps or similar tools, including source control, branching strategies, and deployment pipelines
• Contribute to team capability through mentoring, knowledge sharing, and establishing repeatable development and support practices

About You

Experienced and pragmatic developer with a strong background in supporting and evolving enterprise systems. Comfortable working in complex environments and can take ownership of both development and operational outcomes.

Skills and Experience

• Extensive experience with Microsoft .NET technologies, including .NET/.NET Core, C#, ASP.NET, and Web APIs
• Strong experience supporting and enhancing legacy or mission‐critical systems
• Proven expertise in SQL and relational database development, including performance optimisation and data integrity management
• Experience with system integration, including APIs, batch processing, and data exchanges
• Solid understanding of modern development practices including Git‐based source control, CI/CD, testing, and Azure DevOps
• Experience diagnosing and resolving production issues across application, database, and integration layers
• Ability to analyse and work with complex existing codebases and manage technical debt effectively

Behavioural Capabilities

• Ability to work independently with limited direction while managing competing priorities
• Strong communication skills, with the ability to translate technical concepts for diverse stakeholders
• Proactive in identifying risks, issues, and opportunities for improvement
• Committed to delivering high‐quality, reliable, and user‐focused outcomes
• Collaborative team player who contributes to a positive and high‐performing work environment
• Tertiary qualifications in Information Technology, Software Engineering, or related discipline
• Familiarity with IT service management frameworks (e.g. ITIL)
• Experience in public sector or large enterprise environments