Contact person: Business Client

Phone:Show

Email:Show

Location: Fulham, United Kingdom

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"## **JOB DESCRIPTION**

---

### PROJECT: CONVOY - Real-Time Location Tracking & Group Communication App

I'm building a location-sharing mobile app called **Convoy** that allows 4+ users to:
- Share real-time GPS location on a shared map
- Navigate together with turn-by-turn directions
- Communicate via integrated walkie-talkie (push-to-talk) mode
- Monetize via ads and premium subscriptions

This is a fixed-price INR 5000 project with 2–3-week timeline. You'll build the complete working app from scratch using Flutter or React Native.

---

### CORE FEATURES YOU'LL BUILD:

1. User Authentication
- Email/Password signup & login (Firebase Auth)
- User profile (name, avatar selection, settings)

2. Real-Time Location Tracking
- Continuous GPS location sharing
- Background location services (keep tracking even when app backgrounded)
- Location accuracy: ±10m
- Update frequency: Every 2-5 seconds

3. Google Maps Integration
- Turn-by-turn navigation (Directions API)
- Show convoy members as transparent circular avatars (60% opacity)
- Display member names, distance, direction indicators
- Zoom/pan with convoy optimization

4. Convoy System
- Leader creates convoy, members join via invite code
- Supports 4 users for free tier, 50+ for premium
- Real-time member list showing:
- Member name
- Distance from user
- AFK status (idle/disconnected)
- Speaking status (if using walkie-talkie)

5. Walkie-Talkie Mode (CRITICAL FEATURE)
- Push-to-Talk button: One person speaks, all others listen
- Only 1 transmitter at a time (others' mics disabled while speaking)
- Visual indicator: " [Name] is speaking" at top of screen
- Audio Ducking (SAFETY FEATURE):
- When user speaks via walkie-talkie
- Navigation audio (Google Maps directions) automatically ducks to 30% volume
- User's voice stays at 100% (so drivers hear walkie-talkie over GPS)
- When speaking stops, navigation audio fades back to 100% smoothly
- Transition time: 0.5 seconds (smooth fade, not jarring)
- Settings: Toggle walkie-talkie on/off, choose hold-to-speak vs tap-to-toggle, adjust audio quality

6. AFK Detection & Timeout System (CRITICAL FEATURE)
- Auto-detect when user is idle:
- No movement >50m for 2+ minutes = IDLE
- App backgrounded for 3+ minutes = DISCONNECTED
- No network for 2+ minutes = OFFLINE
- Display status: Grey avatar + "AFK" label on map
- Auto-remove after 10+ minutes inactive
- Notifications: "You're idle", "[Name] went AFK", "[Name] removed (timeout)"
- Member can rejoin convoy if still active

7. Monetization
- Banner Ads: Google AdMob banner at top of Settings page (free users only)
- Video Ads: 30-second interstitial video when user clicks "Start Convoy" (free users only)
- Premium users see no ads
- User watches ad before convoy starts
- Premium users skip video automatically

8. Premium Subscription
- In-app purchase: £2.99/month (auto-renewing)
- Features:
- Up to 50 users per convoy (vs 4 for free)
- No ads
- Big League Mode: Create convoys with up to 9,999 members
- In Big League: followers can't see each other (only leader sees all)
- Privacy/security for large group events
- Backend: Track premium status in Firebase user profile

---

### TECHNICAL REQUIREMENTS:

**Platform:**
- Flutter (preferred) OR React Native
- iOS + Android builds (APK + IPA)
- Optional: Web PWA (if time allows)

**Backend:**
- **Firebase**: Realtime Database OR Firestore
- Real-time location sync
- User authentication
- Convoy data
- Audio streaming (real-time walkie-talkie)
- **No IONOS/custom hosting needed** (Firebase handles all backend)

**APIs:**
- Google Maps SDK (Android/iOS)
- Google Maps Directions API
- Firebase Auth, Realtime Database/Firestore
- Google AdMob (ads)
- Google Play Billing / Apple IAP (in-app purchase)

**Required Libraries/Services:**
- Location services (Geolocator, Geolocation)
- Audio recording/playback (audio_players, flutter_sound, or native iOS/Android audio APIs)
- Push notifications (Firebase Cloud Messaging)
- State management (Provider, Riverpod, Redux, etc. - developer's choice)

**Permissions (Android):**
- ACCESS_FINE_LOCATION, ACCESS_COARSE_LOCATION
- INTERNET, RECORD_AUDIO
- MODIFY_AUDIO_SETTINGS (for audio ducking)
- WAKE_LOCK, CHANGE_NETWORK_STATE

**Permissions (iOS):**
- NSLocationWhenInUseUsageDescription
- NSMicrophoneUsageDescription
- UIBackgroundModes: location, voip" (client-provided description)