Multi-Strategy Trading App Development

I need a single cross-platform trading application that can execute five distinct strategies covering algorithmic trading, high-frequency trading, and options trading. The build must run smoothly on iOS, Android, and the Web, sharing one code-base where possible so new strategies can be slotted in later without a full re-write.

Core functionality
• Real-time analytics streaming from market data feeds so I can watch positions tick by tick.
• Clean, user-friendly dashboards—think heat maps, P&L panels, and custom watchlists—rendered instantly without lag on mobile or desktop browsers.
• Automated trading bots that respond to pre-set signals 24/7 and can be paused, edited, or restarted from any device.

Architecture notes
I am open to React Native, Flutter, or another robust framework as long as latency stays low and you can pass compliance testing for exchange APIs. A modular back-end (Node, Python, or your preferred stack) should expose REST or WebSocket endpoints for order routing and strategy control.

Deliverables
1. Source code with clear documentation.
2. Deployment scripts for staging and production.
3. A brief guide explaining how to add or modify strategies.
4. One month of post-launch support to fix critical bugs.

Please outline your proposed tech stack, previous work on live-trading systems, and how you will keep execution latency minimal across the three target platforms.