Contact person: Business Client

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Location: Indore, India

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I need a robust automation layer that lets one “master” Flutter device trigger an event and have that same event executed instantly on every linked “child” device. We’ll be relying on an internet-based secure channel—WebSocket for low-latency pushes or fallback HTTPS APIs. The payload will be text-only for now (think JSON instructions or simple state keys). This will include webscraping primarily.

Your task is to architect and code the synchronization logic, wire it into the existing Flutter app, and prove that a single tap or state update on the primary screen propagates to any number of secondaries in real time without missing, duplicating, or delaying messages.

Deliverables
• Server-side or cloud function that brokers the WebSocket / REST traffic
• Dart client module that connects, authenticates, listens, and executes incoming commands on the secondary devices
• Simple command set (e.g., ACTION_ID, TIMESTAMP) with retry and acknowledgment logic
• Demo project or test harness showing at least three devices staying perfectly in sync
• Setup notes so I can reproduce the environment and extend the command list later

Acceptance criteria
1. Round-trip latency under 300 ms in normal broadband conditions
2. Guaranteed “exactly once” execution across all connected devices
3. Clean disconnect / reconnect handling with state resync

If you have prior experience building WebSocket-driven Flutter apps, or have used Firebase, [login to view URL], or similar real-time frameworks, tell me what stack you’d prefer and why. I’m ready to get started as soon as the technical approach is nailed down." (client-provided description)