Skills:
- Maps (Google Maps API, Leaflet, OpenStreetMap API, TravelTime API, Foursquare API)
- Payment gateway (Stripe, etc.)
- Login and Sign Up (Google, Facebook, Twitter)
- Local Notifications and Push Notifications (Firebase Cloud Messaging, OneSignal)
- Barcode and QR code scanning and encoding
- Advertisement (Google AdMob)
- Firebase (Authentication, etc.)
- Real-time chats (Socket.io)
- Version control (GitHub, Bitbucket, GitLab)