I am ready to move from concept to working MVP for a highly confidential, AI-driven healthcare application. The first priority is rock-solid mobile app functionality, delivered for both Android and iOS. I am flexible on frameworks—Flutter or React Native are equally acceptable—so long as the choice meshes smoothly with a Python-based (FastAPI) or Node.js backend and integrates cleanly with OpenAI / other LLM APIs plus an image-recognition model. You will work in a private GitHub repository that I own; all intellectual property and source code remain mine. Before we exchange any additional documentation or datasets, a mutual NDA must be in place. We will structure the build around clearly defined milestones and release payment only upon successful completion of each. Core scope you will touch: • Secure backend with API endpoints, authentication, and database integration • AI-powered text generation services (OpenAI or similar) • Vision pipeline for image recognition relevant to healthcare data • Cross-platform mobile interface that consumes these services and showcases a smooth user experience Milestone acceptance will be based on functional demos, code review within the repository, and my ability to run the solution end-to-end locally. When you respond, confirm your past work on confidential projects, outline your AI plus vision experience, state comfort with the NDA, and tell me which tech stack you would lean toward for this build.