Delivery App — Real‑Time Tracking & Chat (Flutter, Firebase)
Viktor Zahurskyi
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Posted Jan 15, 2026
Cross‑platform delivery app with live tracking, traffic‑aware navigation, status updates, push alerts, and in‑app chat.
Overview
The Delivery App provides a seamless, reliable delivery experience for customers and couriers with real‑time order tracking, accurate navigation, and smooth communication. Built for iOS and Android with Flutter, it emphasizes performance, scalability, and intuitive UX to boost operational efficiency and customer satisfaction.
Key Features
Real‑Time Tracking: Live courier location, ETA updates, route progress, and geofencing on Google Maps.
Navigation: Turn‑by‑turn directions, traffic‑aware routing, and reroute on detours.
Order Management: Live status changes (Placed → Accepted → Picked Up → Delivered) with push notifications.
In‑App Chat: Customer–courier messaging with delivery notes and photo sharing.
Proof of Delivery: Photo capture, signature, and OTP/QR confirmation.
Scheduling & Availability: Courier shifts, pause/resume, pickup windows, and batching.
Ratings & Feedback: Post‑delivery ratings and issue reporting.
Offline Resilience: Queue updates offline; auto‑sync when connectivity returns.
Security & Privacy: Role‑based access, masked phone numbers, and location consent controls.
Tech Stack
App: Flutter (Dart) for iOS and Android
State Management: GetX (controllers, DI, navigation)
Maps & Location: Google Maps SDK, Geolocator/Location, Geocoding
Backend & Data: Firebase Authentication, Cloud Firestore (orders, tracking, chat), Firebase Cloud Messaging (push)
Storage: Firebase Storage (proof photos, receipts)
Server Logic: Firebase Cloud Functions (status workflows, notifications, webhooks)
Payments (optional): Stripe or Cash on Delivery flows
Analytics & Quality: Firebase Analytics, Crashlytics, Performance Monitoring
CI/CD: GitHub Actions or Codemagic for build, test, and deploy
Workflow
Place Order: Customer submits order; Firestore creates order with pickup/dropoff and time window.
Assign: Courier accepts; app locks job, starts navigation, and shares live location to the customer.
Navigate: Turn‑by‑turn routing; reroute on traffic or road closures; geofence triggers on arrival.
Communicate: In‑app chat for clarifications, gate codes, or handoff notes.
Deliver: Capture photo/signature or OTP; status moves to Delivered; customer gets receipt.
Review: Customer rates delivery; issues can be flagged for support follow‑up.
Data & Realtime Sync
Live Locations: Courier app publishes coordinates at intervals; customer view subscribes to updates.
Order Status: Atomic transitions in Firestore with Cloud Functions enforcing valid states.
Notifications: FCM pushes for status changes, assignment, chat messages, and delivery attempts.
Challenges & Solutions
GPS Drift → Kalman filtering and snap‑to‑route to stabilize courier position.
Battery Usage → Adaptive update intervals based on motion/activity and screen state.
Missed Notifications → Topic/user targeting with delivery receipt checks and in‑app fallbacks.
Assignment Conflicts → Server‑side transactions to prevent double assignment and ensure fairness.
Results
Faster, more reliable deliveries via live tracking and traffic‑aware navigation.
Higher customer satisfaction with transparent ETAs and in‑app communication.
Scalable operations through modular design, real‑time sync, and robust workflows.
