We're seeking an experienced Senior .NET Developer to join a high-performing technology team responsible for a business-critical enterprise platform. You'll play a key role in maintaining, improving, and modernising a large-scale legacy system while working closely with technical and business stakeholders. What's on Offer $120/hr Super (PAYG) Contract until 18 December 2026, with potential extension Hybrid and flexible working arrangements Opportunity to work on a large, business-critical enterprise application Collaborative and supportive technical environment Immediate start (subject to National Police Check) Key Responsibilities Develop, maintain, and enhance applications using C#, .NET/.NET Core, ASP.NET, and Web APIs Support and improve a complex legacy enterprise system Build and maintain APIs, integrations, batch processes, and application services Troubleshoot and resolve application, database, and integration issues Develop and optimise SQL Server components, including stored procedures and scripts Participate in vendor knowledge transfer and technical documentation activities Support releases, deployments, and ongoing system improvements About You Strong commercial experience with C#, .NET/.NET Core, ASP.NET, and Web APIs Proven experience supporting and enhancing enterprise or legacy applications Strong SQL Server development and troubleshooting skills Experience with APIs, integrations, batch processing, and data exchange solutions Hands-on experience with Azure DevOps, Git, CI/CD, and modern development practices Strong analytical and problem-solving skills with experience resolving production issues Ability to work autonomously and engage effectively with technical and non-technical stakeholders Government or highly regulated industry experience is advantageous Requirements Australian resident with full working rights Ability to obtain and maintain a National Police Check If you're looking for a contract where you can apply your technical expertise to a critical enterprise environment and make a genuine impact, apply now. Interviews may commence before the closing date. Further information provided upon request. Ready to take the next step? APPLY NOW with your Updated Resume and reach out to Aireen Grace Santiago – National Delivery Lead, Northbridge Recruitment. Email: aireen@nbridge.com.au or call me at 0432810916 for a confidential discussion. For this and other opportunities please visit nbridge.com.au “We encourage people with disabilities and from other diverse backgrounds to apply. We do not discriminate based on disability.” Only shortlisted candidates will be contacted.