Mobile Application Developer

Role & responsibilities

Preferred candidate profile

Key Requirements for Android and iOS Developers Specializing in Video Calling, Voice Calling, and Video Streaming

core mobile development expertise

Core Platform-Specific Skills

Android

Specialized Skills for Video/Voice Calling and Streaming

These features involve handling camera/microphone access, peer-to-peer connections, low-latency streaming, network adaptability, and media processing.

• Strong expertise in WebRTC

  :
• Core APIs: getUserMedia (media access), RTCPeerConnection (peer setup), RTCDataChannel (data transfer).
• Native integration: Official WebRTC libraries for Android and iOS.
• Handling ICE/STUN/TURN servers for NAT traversal, signaling (e.g., via WebSockets or Firebase).

• Experience with third-party RTC SDKs/APIs

  (highly valued, as they simplify complex WebRTC setup):
• Popular options: Agora, ZEGOCLOUD, VideoSDK, Twilio, Vonage (OpenTok), Sinch, MirrorFly, QuickBlox.
• Ability to integrate features like group calls, screen sharing, adaptive bitrate, noise suppression, and low-latency streaming.

• Media handling and permissions

  :
• Camera/microphone access and management (front/rear switching, mute/unmute).
• Audio/video codecs (e.g., VP8/VP9, H.264, Opus).
• Streaming protocols (e.g., RTMP for live broadcasting, HLS for playback).

• Networking and performance optimization

  :
• Handling variable network conditions (packet loss, jitter, bandwidth adaptation).
• Background modes (e.g., VoIP push notifications on iOS via PushKit/CallKit, Android Telecom Framework).
• Battery and data efficiency for prolonged calls/streams.

• UI/UX for real-time features

  :
• Custom views for video rendering (e.g., SurfaceView/TextureView on Android, RTCEAGLVideoView on iOS).
• Call screens, overlays, PIP (Picture-in-Picture), and notifications.

Additional Valuable Skills

• Backend integration: Signaling servers, authentication (e.g., tokens from Firebase or custom servers).
• Testing and debugging: Tools for network simulation, media quality metrics (jitter, latency).
• Security: Encryption (DTLS/SRTP in WebRTC), secure token handling.
• Soft skills: Problem-solving for real-time issues, collaboration with backend teams.

Experience and Portfolio Expectations

• Proven projects: Apps with 1:1/group video calls, voice calls, or live streaming (e.g., similar to Zoom, WhatsApp, or Twitch mobile features).
• Portfolio demos: GitHub repos or live apps showcasing WebRTC/SDK integrations.
• Bonus: Contributions to open-source WebRTC projects or handling edge cases (e.g., low-bandwidth environments).