Build, Innovate, Secure – All Under One Roof.
Custom apps, AI integration, and cybersecurity expertise in one team. Empowering you to launch and scale with confidence.
Castellan Cyber is a Brisbane-based tech studio that combines a consultancy's strategic insight with a development team's building power. We partner with ambitious startups and growing businesses to create intelligent software solutions with security baked in from day one. Our mission: help you innovate faster while staying secure and compliant, so you can focus on your vision.
Our Core Services
Integrated solutions designed for growth and security.
App Development
Custom web & mobile applications built for performance and scale. From intuitive UI design to backend architecture, we create software that grows with your business.
Learn More →AI-Powered Solutions
Next-generation AI integration, including autonomous agents and intelligent workflows. We infuse your apps with AI capabilities that automate tasks and deliver smarter user experiences.
Learn More →Cybersecurity for Startups
Security and compliance services tailored to startups and SaaS. We safeguard your data, implement best practices, and prepare you for standards like ISO 27001 & SOC 2.
Learn More →The Castellan Advantage
What makes us different from hiring separate firms?
One Partner, Complete Solution
Innovation Meets Security
Startup-Centric Approach
Proven Expertise