VoIP Developer (Kamailio-focused)

This is a remote position.

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Role Overview

We are looking for an experienced VoIP Developer with strong expertise in Kamailio/OpenSIPS, SIP-based communication systems, and a solid understanding of IMS/Diameter. The ideal candidate will have hands-on programming experience in C/C++, strong debugging skills, and the ability to work on large-scale communication platforms.

Key Responsibilities

• Develop and maintain VoIP applications and SIP-based communication solutions.
  
• Work with SIP/SDP, RTP/SRTP, TLS, Diameter, and related communication protocols.
  
• Troubleshoot and resolve issues related to signaling, media, networking, and system performance.
  
• Collaborate with cross-functional teams for feature development and platform enhancements.
  
• Perform code reviews and ensure high-quality deliverables.
  
• Work with databases (MySQL, MongoDB) for configuration, logging, and provisioning.
  
• Contribute to design discussions and provide technical guidance when required.
  

Required Skills

• Strong understanding of TCP/IP, VLAN, L3 VPNs.
  
• Excellent knowledge of SIP/SDP, RTP/SRTP, TLS protocols.
  
• Hands-on experience with Kamailio or OpenSIPS (mandatory).
  
• Programming experience in C/C++ (mandatory).
  
• Good understanding of Diameter protocol.
  
• Experience with MySQL and MongoDB.
  
• Knowledge of IMS call flows.
  
• Understanding of PBX/Enterprise Communication Server features.
  
• Strong troubleshooting, problem-solving, and debugging skills.
  
• Good written and verbal communication skills.
  

Nice-to-Have Skills

• Experience with Inter-process communication, API design, message queues.
  
• Exposure to FreeSWITCH, Asterisk.
  
• Experience in building VoIP components like SoftPBX, Voicemail, ACD, IVR systems.
  
• Knowledge of scripting and programming languages: Python, PHP, JavaScript, Java.
  
• Strong knowledge of Linux systems, server administration, Linux command-line tools.
  
• Understanding of firewalls, security, networking concepts.
  
• Familiarity with tools like CMake, Git.