Wireshark, Rtp, Uikit, Webrtc, Asterisk, Swift, PushKit, SwiftUI, Background terminated-state incoming calls, freeswitch, Kamailio, PJSIP, FusionPBX, SIP WebRTC debugging, APNs VoIP Push Notifications, CallKit, Linphone SDK, PJSUA2, AVAudioSession, SIP, SRTP, Bluetooth AirPods audio routing, Wi-Fi ? 4G 5G network handover

Rest Apis, Java, MVVM, Swift, Android, Kotlin, Objective-c, Git, Ios, Jetpack Components, CI CD, Clean Architecture, SwiftUI

Sso, API design, Oauth, Memory Management, Swift, Cocoapods, Objective-c, Security Protocols, Swift Package Manager, data encryption, iOS SDKs, XCFrameworks, Swift Concurrency, iOS frameworks