How to Build an On-Demand Delivery App in FlutterFlow (Customer, Driver & Merchant)

On-demand delivery services — encompassing food delivery, grocery logistics, parcel courier services, and pharmacy dispatch — represent one of the highest-volume digital business models in the world. However, an on-demand delivery business is not a single mobile app: it is a synchronized three-sided ecosystem consisting of Customers, Merchants (or dispatchers), and Couriers. FlutterFlow enables founders to build, coordinate, and launch all three components from a unified backend.

The three-sided delivery platform ecosystem

To successfully fulfill an order from placement to doorstep handoff, three distinct applications must communicate with sub-second synchronization:

1. Customer App (Mobile - iOS & Android): Store and menu discovery, category browsing, item customization (modifiers, extras, dietary notes), real-time cart calculation, delivery address autocomplete, multi-gateway checkout, and live map tracking of the approaching courier.

2. Courier App (Mobile - iOS & Android): Delivery request alerts with earnings breakdown and estimated mileage, one-tap accept/decline, turn-by-turn navigation integration with Google Maps/Apple Maps, in-app customer calling, and photo proof-of-delivery capture.

3. Merchant Dashboard (Tablet & Web): Audio alerts for incoming orders, preparation time adjustments, live order status management (Accept, In Kitchen, Ready for Pickup), inventory item toggling, and courier handoff verification.

The order state machine in FlutterFlow

The core of any delivery platform is the order lifecycle. In Firebase Firestore or Supabase, each order transitions through strictly validated state milestones:

ORDER_PLACED → ACCEPTED_BY_MERCHANT → PREPARING → READY_FOR_PICKUP → COURIER_ASSIGNED → OUT_FOR_DELIVERY → ARRIVED → COMPLETED

In FlutterFlow, Firestore real-time listeners automatically update the customer's live tracking screen whenever a state changes. When the merchant taps "Ready for Pickup", the assigned courier receives a high-priority push notification immediately, eliminating wasted waiting time at the store.

Real-time GPS tracking and geofencing

Customer anxiety peaks during the delivery window. Providing visual, real-time tracking transforms the customer experience:

• Location broadcasting: While on an active delivery, the courier app broadcasts its GPS coordinates periodically via a lightweight background service.
• Map animation: In the customer app, the courier marker moves smoothly along the polyline path rendered via the Google Maps Directions API.
• Geofence arrival trigger: When the courier approaches within 100 meters of the delivery destination, a geofence trigger automatically sends a push notification: "Your courier is arriving now!"

Marketplace split payments with Stripe Connect

Handling multi-party payouts manually is unsustainable. We integrate Stripe Connect Custom or Express accounts: when a customer pays $35 for an order, the payment is split automatically:

• $24 is transferred to the restaurant merchant.
• $7 is transferred to the courier (delivery fee + tip).
• $4 is retained in the platform's bank account as marketplace commission.

Development cost and launch timelines

Traditional software development agencies quote $80,000–$150,000 to build three separate native delivery applications. With FlutterFlow, KinetixSoft builds and deploys complete Customer, Driver, and Merchant applications for $10,000–$22,000 within 7 to 10 weeks.

Launching an on-demand delivery or courier service? Book a free scoping call with our delivery platform specialists.