I want a single codebase that will compile cleanly for Android, iPhone and PC so every user—whether they carry a phone or sit behind a desktop—gets the same solid experience. The core product must be flexible enough to run several editions: a currency‐exchange desk, a full school information system, a gym membership tracker, parking-lot control, and a general retail shop variant. I am happy to let you reuse modular components so long as each edition is easily switched on or off through configuration. Key technical expectations • Robust back-end: My preference is a high-performance SQL or NoSQL database you are comfortable scaling. • Custom domain: I will register any domain name we decide on; you simply have to point the app and admin panel to it. • Multilingual interface: English, Spanish and Arabic first, with room for more via language files. • Admin dashboard / project manager view: role-based access and real-time reporting for each edition. I am not in a rush, so feel free to plan milestones sensibly—as long as the final binaries and source are delivered, documented and ready to deploy.