Contact person: Business Client

Phone:Show

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Location: Kyiv, Ukraine

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I want a macOS 10.15-compatible bridge, written in Swift, that watches the live SPY price in Webull Desktop and automatically sends both buy and sell option orders the moment price touches user-set levels.

The key requirement is an experience identical to Thinkorswim’s drag-on-price-chart flow: I must be able to drop and drag horizontal entry and exit lines directly on the SPY chart— not on the option chain— and have those lines actively drive the option trades. If Webull’s interface will not let you draw on the chart natively, please overlay or otherwise mirror a draggable surface that stays perfectly synced with the live chart and still launches the orders.

Core scope
• Real-time SPY price stream → trigger engine for option orders (underlying price only; option premium is irrelevant)
• Draggable entry / exit lines rendered over the SPY chart with instant visual feedback
• Full support for both buying and selling SPY option contracts
• Runs smoothly on Catalina without requiring users to upgrade macOS
• Clean error handling and status feedback inside the GUI

When you reply, concentrate on your experience building trading integrations, macOS apps, chart overlays, or working with Webull’s (official or unofficial) APIs. If you have tackled similar drag-to-trade features before, that example will carry the most weight." (client-provided description)