Simultaneous Stock Order Broadcaster

I need a lightweight application that lets me enter a single stock buy-or-sell order and have it fire off instantly to 8–10 different stock-trading platforms at once. The core idea is simple: type the ticker, quantity, price (or mark as market), hit “Send,” and the tool should replicate that exact order across every linked broker in real time with no extra clicks.

Scope
• Integrate with major retail trading APIs (think Zerodha Kite, Angel One, Upstox, etc.; final list will be provided).
• Handle only equities for now—no options or crypto.
• One-click execution: the moment I confirm, the order hits all connected platforms simultaneously.

Key requirements
• Secure credential storage (OAuth, API key vault, or encrypted local store).
• Basic dashboard: add/remove platforms, view connection status, edit default order settings.
• Robust error handling—if any broker rejects an order, log the reason and alert me without interrupting the rest.
• Execution logs with timestamps for post-trade reconciliation.
• Clean, snappy UI (web or desktop; I’m flexible) built with mainstream tech such as Python + Flask/PyQt, Node.js + Electron, or C# WPF—choose what you’re most comfortable with, but it must run on Windows.

Deliverables
1. Fully functional application with installer or deploy script
2. Source code and documentation (setup, configuration of each API, and usage guide)
3. Short demo video showing a live multi-broker order in action

Acceptance criteria
• Same order reaches every selected broker within two seconds of hitting “Send.”
• All responses (success, partial fill, rejection) captured and displayed in the log.
• No sensitive credentials exposed in plain text at any point.

If you’ve built trading utilities, FIX/REST integrations, or high-speed order routers before, I’d love to see examples. Let’s make rapid multi-platform execution as effortless as possible.