Project Role Custom Software Engineer Project Role Description Develop custom software solutions to design code and enhance components across systems or applications Use modern frameworks and agile practices to deliver scalable high-performing solutions tailored to specific business needs Must have skills Node js Positive to have skills Python Programming Language Minimum 5 year s of experience is required Educational Qualification 15 years full time education Summary We are seeking a highly skilled Voice Socket Application Developer with 5 experience in Socket Programming Node js or Python and real-time communication systems The ideal candidate will design develop and integrate advanced SIP VoIP applications IVR workflows and custom dial-plans leveraging open-source or commercial telephony platforms such as Asterisk FreeSWITCH or Kamailio This role requires robust problem-solving skills in real-time communication environments and hands-on experience with SIP signaling and media handling Roles Responsibilities - o VoIP SIP Application Development o Design develop and maintain SIP-based and VoIP applications using Node js or Python o Implement advanced socket communication for call events signaling and session control o Handle SIP protocols INVITE ACK BYE REGISTER OPTIONS etc and ensure reliable signaling flows o IVR Dial-Plan Development o Build and customize IVR workflows call routing logic and voice prompts o Create optimize and maintain SIP dial-plans and call handling features transfers hold forwarding o Integrate IVR flows with backend systems APIs and databases o Telephony Platform Integration o Integrate with PBX systems such as Asterisk FreeSWITCH or Kamailio OpenSIPS o Connect and configure SIP trunks and carrier interconnects o Work with media servers for DTMF handling RTP streaming codec management G 711 G 729 Opus and NAT traversal o Monitoring Debugging Optimization o Analyze and debug SIP messages RTP streams and media quality issues o Use protocol analysis tools for troubleshooting real-time communications o Collaborate with DevOps Infra teams to deploy monitor and scale applications in production o Documentation Collaboration o Prepare technical documentation for IVR flows APIs dial-plans and system architecture o Collaborate with cross-functional teams for feature development testing and release Professional Technical Skills o Strong proficiency in Node js or Python with a deep understanding of socket programming o Hands-on expertise in SIP Session Initiation Protocol and WebRTC o Proven experience developing and deploying IVR systems and custom dial-plans o Familiarity with Asterisk FreeSWITCH Kamailio or OpenSIPS o Solid understanding of telephony protocols SIP signaling flows and VoIP codecs o Experience with media servers DTMF handling and interactive voice prompts o Knowledge of WebRTC and NAT firewall traversal techniques o Strong troubleshooting and debugging skills in real-time communication systems o Proficiency with Linux Unix environments and scripting tools Bash Shell etc o Experience with SIP testing debugging tools Wireshark sngrep SIPp o Familiarity with RESTful APIs and backend integration for telephony platforms o Understanding of VoIP security encryption and NAT traversal best practices Additional Information - The candidate should have minimum 5 years of experience in Node js - This position is based at our Pune office Working from client office - 2 days week is required - A 15 years full time education is required 15 years full time education