Synergy Beam Solutions delivers cutting-edge IT and cybersecurity solutions, specializing in turnkey systems that empower businesses worldwide. As part of our innovation pipeline, we are developing a state-of-the-art telecommunications platform for high-performance call centers.

We are seeking a Senior VoIP Engineer to join our growing team and help build, scale, and maintain our VoIP SaaS platform. You’ll design and optimize SIP-based communication systems that prioritize reliability, scalability, and security, while enhancing real-time voice workflows and observability across global deployments.

Join a mission-driven team tackling complex technical challenges and redefining how communication and emergency systems operate worldwide.

Key Responsibilities

• Design, develop, and maintain SIP and RTP-based VoIP systems, ensuring high performance and reliability.


• Troubleshoot complex routing, codec, and signaling issues using packet captures, logs, and SIP traces.


• Optimize network and protocol performance (SIP, RTP, TCP/IP, DNS, NAT, firewall).


• Integrate and support PBX, SBC, and cloud VoIP environments to ensure seamless interoperability.


• Monitor and improve call quality metrics (MOS, jitter, latency) with proactive performance tuning.


• Lead architecture and deployment of voice applications, including transcription, AMD/VMD, and AI-driven features.


• Collaborate with engineering and product teams to deliver scalable, resilient, and secure VoIP solutions.


• Act as the final escalation point for complex VoIP incidents and vendor coordination.

Technical Requirements

• 6+ years in software engineering, including 4+ years in VoIP/SIP development.


• Strong experience with Freeswitch and Kamailio.


• Proficiency in Lua and Python (Go or C/C++ a plus).


• Deep understanding of network protocols and tools (Wireshark, SIPp, libpcap, Linux/BSD sockets).


• Experience with WebRTC, TURN/STUN servers, and cloud platforms (AWS, Google Cloud, Cloudflare).


• Familiarity with GSM, E1 gateways, and serial-connected telecom hardware.


• Experience in building scalable systems and automated testing frameworks.

Personal Qualities

• English proficiency: B2 (Upper-Intermediate) or higher.


• Strong communication and collaboration skills; positive team player.


• Exceptional troubleshooting and analytical abilities.


• Self-motivated, adaptable, and proactive in problem-solving.


• Passionate about building technology that has real-world impact.

Preferred (Nice-to-Have)

• Experience with embedded systems or SIP hardware devices.


• Hands-on knowledge of call flow simulation tools (SIP testing frameworks).


• Familiarity with RESTful APIs and scalable service design.


• Understanding of global network routing and optimization.


• Experience implementing AI-driven features in VoIP systems.