The project is a full-stack trading solution that must run smoothly on iOS, Android, and in any modern browser. It will stream real-time market data, let users track their portfolios at a glance, and allow immediate trade execution without leaving the app or site. One external financial service will provide prices, account data, and order routing; the build has to connect to its REST/WebSocket endpoints securely and handle authentication, throttling, and error recovery. Key deliverables • Native iOS and Android apps compiled for current OS versions • A responsive web interface that mirrors all mobile functionality • Real-time data, portfolio, and trade modules working end-to-end • Integration layer that talks to the chosen financial service’s API, fully documented • Source code, build instructions, and a short hand-off walkthrough Acceptance criteria 1. Quotes refresh in under one second over a stable connection. 2. Completed trades update the portfolio view instantly. 3. All three platforms pass a basic security audit (OWASP Mobile/Web Top 10). 4. API calls succeed against the sandbox environment and can be toggled to production with a config change. Use any modern stack—React or Flutter for UI, Node.js, Python, or similar for the backend—so long as it meets the performance targets above. Feel free to suggest proven open-source libraries for charting, WebSocket handling, and secure storage.