Programming Languages and Techniques:

- iOS: Swift, iOS 3.x+, WatchOS 1.x+, Apple Watch Kit, AVFoundation, UIKit, WebKit, MapKit, SpriteKit, CloudKit

- Android: Kotlin, Android 4.1+, Android SDK, Dagger2, Butterknife, EventBus

- Cross-platform: React Native, Ionic, Flutter

- Backend: node, Express, Laravel, Asp.net

- Database: MySQL, PostgreSQL, MongoDB

- Cloud Service: AWS (Lambda, EC2, S3, Cognito, DynamoDB), Firebase (Firestore, Cloud Functions, Real-time Database), Heroku, Digital Ocean

- Agile Tools: Github, Bitbucket, GitLab, Jira, Trello, Docker

- Web Servers: Apache, Nginx

- Package Libraries/Build Tools: npm, yarn, gulp, composer, webpack, babel, bower

- Other Techniques: Geolocation, Payment Gateways Integration, Social Account Integration, Twilio, Google Analytics, Live Streaming, Push Notifications, SMS, Chatting and Messages, QR Scanning, In-App Purchase, In-App Advertising, Oauth, Rest API Development