I need a fully functional real-time stock-trading application that runs on both iOS and Android. The focus is speed and reliability: users should see market movements the instant they happen and be able to act just as fast. What must be in the first release: • Live stock prices and interactive charts streamed with sub-second latency • Instant buy/sell order execution wired to a reputable brokerage API • Secure user account management for sign-up, KYC, portfolio view, and transaction history You’ll design the UI, build the mobile front-end, integrate real-time data feeds, and set up any supporting back-end needed for authentication, push notifications, and data caching. Clean, well-documented code in a Git repo is required for hand-off to my in-house team. Experience with Swift/Kotlin—or a cross-platform framework such as Flutter or React Native—plus websockets, OAuth2, and real-time charting libraries is essential. Show me finance or trading apps you’ve shipped and note the data or brokerage services you prefer so we can confirm compatibility early. Acceptance criteria: 1. Apps pass App Store & Google Play review in TestFlight/Closed-Beta 2. Market-data latency under one second on 4G 3. Trade execution status reflected in-app within two seconds 4. All sensitive data encrypted at rest and in transit 5. Unit and integration tests with at least 80 % coverage Let’s discuss milestones and timelines so we can move quickly to launch.