What does it actually take for a mobile developer to build a production-ready app for Meta Quest? In this session, we share how we transformed a core segment of a Flutter mobile app with millions of downloads into an immersive concert and performance media viewer for XR. We’ll break down what it takes to move an XR project beyond a simple tech demo into a polished product. We’ll pull back the curtain on our stack and workflow. On the design side, we’ll show how we used Gemini 3 Flash Image, Figma, and ShapesXR to shape the experience. We’ll also share a key mindset shift: treating the headset as connected hardware rather than rebuilding the full mobile app in XR. On the development side, we’ll cover Kotlin, Meta Spatial SDK, Meta Spatial Editor, Quest login UX, cross-team collaboration, and how tools like MCP, Meta Quest Simulator, and AI models helped us move faster.