Asterisk to FreeSwitch Migration - B2BUA / Django

CWe are looking for an experienced VoIP engineer to lead the migration of our existing Asterisk-based telecom platform to FreeSWITCH, integrated into our custom B2BUA architecture built on Django. This is not a greenfield deployment — we already operate a production environment and require a structured migration with minimal disruption. Scope of Work Analyze existing Asterisk deployment and call flows Design and implement migration to FreeSWITCH Integrate FreeSWITCH with our existing Django-based B2BUA Maintain feature parity during migration Migrate SIP routing, dialplans, carrier interconnections, and call handling logic Ensure compatibility with existing APIs and backend services Optimize call performance, concurrency, and reliability Configure logging, monitoring, failover, and troubleshooting workflows Support testing and production rollout Current Environment Existing PBX: Asterisk Target Platform: FreeSWITCH Backend: Django (Python) Architecture: Custom B2BUA SIP trunking and carrier integrations already in production Required Skills Strong hands-on experience with FreeSWITCH Deep understanding of Asterisk architecture and migration strategies Experience building or integrating B2BUA systems Python / Django development experience SIP, RTP, SBC, WebRTC, and telecom signaling expertise Experience with scalable carrier-grade voice platforms Linux server administration and automation Nice to Have Experience with high CPS / high concurrent call environments Kamailio/OpenSIPS knowledge Database optimization (PostgreSQL/MySQL) CI/CD and containerization experience Deliverables Migration plan and architecture documentation Working FreeSWITCH deployment Successful migration of production traffic Deployment documentation and knowledge transfer