Trading Strategy Builder app

I’m building a app` that lets me create, edit, and save fully custom trading strategies for options, futures, and stocks. Every piece of a strategy—from entry logic and exit rules to position sizing and risk controls—must be editable rather than locked behind presets, so think of it as a blank canvas rather than a template picker.

The interface should feel intuitive for non-coders: dropdowns, drag-and-drop blocks, or visual condition builders are all fine as long as they let me control Greek targets, time-to-expiry filters, multi-leg option structures, future roll-over logic, and equity order types with equal flexibility. Real-time validation of parameters is important so a user can’t save an impossible spread or an order that exceeds account limits.

Backend language or framework is your choice; just keep the code modular so new instruments or data feeds can be added later. The page will eventually hook into brokerage APIs for live deployment, so structure the logic layer cleanly (REST endpoints, GraphQL, or similar) and keep the UI-backend coupling loose.
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Deliverables
• Responsive web page with the visual builder fully wired to a mock backend
• Clear, commented source code plus a short README that explains setup and where to plug real data feeds
• A sample JSON (or YAML) schema that represents a strategy created through the UI, proving every component is captured