Senior React Native Developer — VoIP / WebRTC SDK Integration (Urgent Project)

We are looking for an experienced React Native developer to help build and integrate a VoIP calling SDK into an existing mobile application.

This is not a basic app development task. We need someone who has real experience with VoIP / WebRTC / SIP / SDK-level work and can deliver quickly.

### Project Scope

- Integrate and extend a React Native VoIP SDK
- WebRTC calling using SIP.js
- Inbound & outbound call handling
- Push notification based incoming calls
- Background call handling
- App-based configuration dialing logic
- SDK-style packaging + documentation support

Our team will handle:

- OpenSIPS / SBC (Call logic)
- SIP infrastructure
- APIs

You will handle:

- React Native SDK layer
- Mobile VoIP calling integration
- Native module bridging if required
- Call UI handling
- Stability + performance tuning
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### Required Experience (Must Have)

Do NOT apply if you don’t have these:

- Strong React Native experience (3+ years)
- VoIP or WebRTC calling integration
- SIP.js or similar SIP/WebRTC libraries
- Push notifications for call flows
- Background service handling (iOS + Android)
- Native bridge modules experience
- SDK development experience (not just apps)

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### To Apply — Answer These

1. Have you built any VoIP or calling app? Share links
2. Have you worked with WebRTC or SIP.js?
3. Have you created a React Native SDK/module before?
4. Can you start immediately?
5. Estimated delivery time for VoIP SDK integration?