Our Melbourne AI mobile app methodology integrates AI capabilities into mobile experiences that feel native, fast, and trustworthy. On-device AI maximises performance and privacy. We deploy AI models directly on the device using: CoreML (iOS) for on-device inference — image classification, object detection, NLP, and custom models running at native speed with no network latency and no data transmission, ML Kit (cross-platform) for common AI tasks — text recognition, face detection, barcode scanning, smart reply suggestions — with on-device processing as the default, and TensorFlow Lite (cross-platform) for custom models requiring deployment on both iOS and Android — models trained in the cloud but optimised (quantised, pruned) for mobile deployment. On-device AI benefits: instant response (no network round-trip — AI features respond in milliseconds rather than seconds), offline capability (AI features work without connectivity — essential for field service apps and rural healthcare), privacy by architecture (sensitive data processed on-device — the data never enters a network, never reaches a server, never creates a data breach risk), and cost efficiency (no per-inference API costs — once the model is deployed, inference is free). Server-side AI complements on-device processing for capabilities that require more compute power or access to backend data. LLM-powered features (conversational interfaces, complex text analysis, personalised recommendations) use server-side AI — the mobile app sends the user's query to the backend, the backend queries the LLM with appropriate context (RAG from the organisation's knowledge base), and the response returns to the app. Server-side AI must handle: network latency (designing UI that gracefully handles the 1-3 second response time of LLM inference — streaming responses, skeleton loading, and background processing), offline fallback (when the network is unavailable, the app provides cached or basic responses rather than failing), and data minimisation (sending only the minimum data needed for the AI query to the server — not the user's entire context). React Native is our primary mobile framework, enabling: single codebase for iOS and Android (reducing development cost and maintenance burden), native module bridges to CoreML and ML Kit (enabling on-device AI with native performance), code sharing with web applications (for organisations that need both mobile and web platforms), and rapid iteration (over-the-air updates for UI and business logic without App Store review). Privacy Act-compliant AI mobile architecture implements Australian privacy requirements. Consent management: the app clearly explains what data AI features use, how it is processed, and whether it leaves the device — before collecting any data. Separate consent for AI features that process personal information. Data handling disclosure: in-app privacy dashboard showing what data is stored on-device, what is sent to servers, and how to delete it. On-device data encryption using iOS Keychain / Android Keystore.