Freeswitch Developer

Job Opening: FreeSWITCH DeveloperLocation: Ecospace Business Park, Rajarhat, Newtown, KolkataEmployment Type: Full-Time, PermanentShift: Day ShiftExperience: Minimum 4+ years in FreeSWITCH/VoIP DevelopmentResponsibilities:Design, develop, deploy, troubleshoot, and maintain tools and services supporting our cloud telephony network.Customize FreeSWITCH for large-scale audio/video conferencing (1000–1500 concurrent calls).Expertise in SIP, RTP, RTCP, TURN, STUN, NAT, TLS.Hands-on experience with RTP Proxy and routed audio conferences.Understanding of SDP Protocol offer/answer mechanism.Work with load testing tools for FreeSWITCH audio conferences.Deploy and manage multiple FreeSWITCH instances using load balancers.Debug issues using packet captures (Wireshark/Ngrep).Collaborate with mobile/API teams for integration and support.Knowledge of codecs (PCMU, PCMA, G729, Opus) and open-source telephony technologies (FreeSWITCH, WebRTC).Familiarity with SIP servers (SER/OpenSER), proxy servers, SBC, SIPX is a plus.Qualifications:Bachelor’s degree in Engineering (B.Tech/MCA).4+ years of hands-on experience in FreeSWITCH development or related VoIP technologies.Strong knowledge of Linux environments and command-line tools.Basic to intermediate SQL knowledge.Proficiency in scripting (Bash, Python, Perl) for automation.Strong understanding of VoIP protocols (SIP, RTP), networking principles (TCP/IP, DNS, DHCP, routing protocols).Excellent troubleshooting skills with ability to resolve complex technical issues.Strong problem-solving, communication, and collaboration skills.Industry Preference:Travel (Preferred)Any Industry (Required)