Build VoIP Business Platform + API Build (Kamailio/FS Custom Development)

We are seeking an experienced development with experience in SIP, Kamilio, FS and other telephony environments, must be able to build custom CPaaS (Communications Platform as a Service) platform. The system will provide a complete voice infrastructure layer, customer portal, developer APIs, and SDKs enabling businesses and developers to build voice-enabled applications and manage telephony services.

The platform will be built using Kamailio as the SIP proxy/SBC, FreeSWITCH as the media server, and a modern web application stack to deliver scalable, secure, and enterprise-grade voice services.