- iOS: Swift, Objective-C, CocoaPods

- Android: Java, Kotlin

- React/React Native, Expo

- C#, Xamarin

- Dart & Flutter

- Rx programming: RxJava, RxKotlin, RxSwift

- Database: MySQL, MongoDB, PostgreSQL, Realm, SQLite

- Backend: Firebase, AWS

Most Experienced SDKs and APIs:

- Map integration: Google Map Service, MapBox, SLC, OpenStreetMap SDK

- Social Network APIs: Google, Facebook, Twitter, LinkedIn, Instagram

- Real-time live streaming: Agora

- Messaging & Call: Twilio, Jitsi, Zoom, Sendbird

- Mail Delivery: SendGrid

- Stripe, Braintree

Most Familiar Development Kits:

- CoreAnimation, CoreData, CoreLocation, CoreImage, AVFoundation

- SpriteKit, SceneKit, Android Game SDK

- Apple Watch Kit

- Apple ARKit, Google ARCore

- BLE