We're looking for a hands-on Senior .
NET Developer.
You'll own our ASP.NET web applications and the legacy systems behind them.
Over time, you'll help us add AI-enabled features.
Our applications run on ASP.NET (.NET Framework 4.8) with VB.NET code-behind.
They talk to other systems through simple XML-over-HTTP web services.
You'll report directly to the Technical Director and work with a reliable codebase that has real users depending on it, so the emphasis is on understanding it deeply, improving it thoughtfully, and modernising where it adds value rather than rewriting for its own sake.
Our primary language is VB.NET.
If you're a strong C# developer who is happy to work in VB.NET, we'd like to hear from you - the transition is straightforward and we'll support it.
Key responsibilities
Maintain, enhance and troubleshoot ASP.NET / .
NET Framework 4.8 web applications
Investigate and resolve production issues across the application, IIS and Windows Server
Develop and maintain XML-over-HTTP web services and integrations with external systems
Design and integrate AI-enabled features using LLM APIs, prompt design and tool/function calling
About you
5+ years' commercial development experience, mainly on Microsoft/.
NET technologies
Strong ASP.NET, VB.NET (or C# with willingness to learn VB.NET) and Visual Studio




HTTP-based web services, XML and JSON
IIS and Windows Server administration for application deployment and troubleshooting
Some exposure to VB6 - you won't be writing new VB6 applications, but you will need to be comfortable reading and debugging legacy VB6 code when issues arise (training provided)
Experience owning production issues on business-critical applications
Strong debugging and analytical skills, and the ability to work independently in an established codebase
Comfortable learning unfamiliar and legacy technologies
A genuine interest in a long-term role and in applying Generative AI to existing business applications
Permanent, long-term position with a stable, established business
2-3 days work from home per week
Internal training on our legacy systems and on AI development
Direct access to the Technical Director and genuine ownership of your work
Occasional on-call for production issues - in practice this is extremely rare
About us
We are an established software company of ***** people.
We build tools that let developers create web applications on various database platforms, and we maintain a suite of established, business-critical web and legacy applications for our customers.
#J-*****-Ljbffr

📌 Senior.Net Developer (Vb.Net / Asp.Net) – Web & Legacy Systems (New South Wales)
🏢 BA Insurance Systems
📍 New South Wales