I’m building a simple paper-trading application so beginners can practise buying and selling stocks with virtual cash—absolutely no real money or payment gateways involved. The core flow is straightforward: users sign up with their phone number, receive an OTP, and are dropped into a clean interface that mirrors live market prices. Here’s the feature set I need brought to life: • OTP-based sign-up / log-in • Pre-loaded virtual balance that updates in real time • Buy & Sell screens using live quotes • Portfolio view summarising profit, loss, and current holdings • Trade history for every order placed • Lightweight, modern UI that feels native on Android I’m still undecided on whether to connect more than one exchange, so please structure the codebase so we can toggle between a single feed today and potentially multiple feeds later without rewriting everything. Tech is flexible—Flutter or React Native on the front end and any solid backend/API stack you’re comfortable with. What matters is clean code, clear documentation, and a build that I can extend for future coursework. When you reply, please include: • Links or screenshots of previous mobile apps—especially anything fintech or real-time data related • Your suggested tech stack • A ballpark timeline broken into milestones (onboarding, core trading engine, UI polish, final QA) • Your estimated cost, keeping in mind this is a student project with limited funds If you have questions about data providers, UI references, or exchange coverage, let me know and we can clarify before kicking off. Looking forward to seeing how you’d tackle this learning-focused trading simulator.