CastleSoft Information

I'm Andrew Tierney, Founder and CEO of CastleSoft, a founder-led, AI-first software company from Newcastle, Australia. I began my career as a programmer in 1988, founded CastleSoft in 1995, and today set the direction for our team of specialist AI agents, bringing 38 years of hands-on engineering experience to how they are designed, governed and used. It's a different way of working: specialist AI agents across engineering, data, security, finance, reporting, operations and support, with human oversight for every critical decision. This lets an experienced, focused business deliver at scale without cutting corners. What we build: • CastleSoft AI: AI agents and agentic workflows, engineered in C# and .NET • CastleSoft Health: secure software that streamlines healthcare administration and revenue cycle management • CastleSoft Studios: interactive applications, games and AR/VR experiences How we build it: • Trustworthy by design: AI work is logged and auditable, separate review agents cross-check outputs, and people approve decisions with legal, financial, security or patient-care impact. • Privacy-first: we never monetise data for advertising, and on request we keep processing in Australia, using local AI models on Apple silicon or de-identifying data before it reaches commercial models. • Engineering discipline: C# and .NET at the core, with Microsoft Foundry, Microsoft Agent Framework, Semantic Kernel and MCP for agentic AI, and testing, code review and security checks on everything we ship. • Inclusive: multilingual, accessible software for the diverse communities our clients serve. Our mission is to design and build secure, privacy-first software and AI agents in C# and .NET, giving organisations practical automation that is reliable, accountable and built to last. We're based in Newcastle, NSW, with something exciting coming soon. If you're exploring AI agents, modernising a .NET system, or need AI that keeps your data in Australia, I'd be glad to talk.