CastleSoftAbout CastleSoft
A founder-led, AI-first software company from Newcastle, Australia.
CastleSoft was founded on 26 May 1995 by Andrew Tierney, a University of Newcastle graduate with a Bachelor of Mathematics with Computer Science. For more than 30 years we have built software for government, defence, education, mining, utilities, superannuation, accounting and small business, across desktop, mobile, web, cloud, wearables, consoles and IoT.
Today CastleSoft is AI-first and engineered in C#. Andrew leads a coordinated team of specialist AI agents, with human oversight for critical decisions, and we work through three divisions: CastleSoft AI, CastleSoft Health and CastleSoft Studios.
Privacy and security are part of how we build. We never monetise your data for advertising or create advertising profiles, and on request we keep data processing in Australia. Our Privacy and Data Protection page explains our practices in full.
Our Story
- 1988
Andrew Tierney begins his career as a programmer.
- 1993
Andrew graduates from the University of Newcastle, Australia, with a Bachelor of Mathematics with Computer Science.
- 1995
CastleSoft is founded in Newcastle, Australia, on 26 May.
- 2004–2005
Andrew co-authors research on enterprise information systems and adaptive user interfaces.
- 2025
Andrew steps back from the CTO role to lead CastleSoft as CEO, directing a team of specialist AI agents.
- Today
CastleSoft is AI-first and engineered in C#: a founder-led team of specialist AI agents working across CastleSoft AI, Health and Studios, with offices in Newcastle (Australia) and Singapore.
Our Vision
Smarter decisions for every organisation, made with AI that people can trust.
Our Mission
We 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.
Andrew Tierney
Founder | CEO
Our Divisions
CastleSoft Group brings together three specialist divisions. CastleSoft AI builds AI agents and agentic workflows, CastleSoft Health creates secure software for healthcare providers, and CastleSoft Studios develops games, interactive applications and AR/VR experiences.
Guided by our #EqualityForAll philosophy, we build inclusive, multilingual platforms and foster diverse perspectives. Read more about our commitment to equality.
Qualifications
Andrew brings 38 years of IT experience to CastleSoft and leads its direction as Founder and CEO. He sets the architecture and engineering standards behind our C# and .NET software, and directs how our specialist AI agents are designed, governed and used.
Work With CastleSoft
Whether you need AI agents, a healthcare solution or an immersive experience, we would like to hear about your project.