Synergy Beam Solutions

Senior VoIP Engineer

Synergy Beam Solutions

contract

Posted on:

Location Type: Remote

Location: Remote • 🇺🇸 United States

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Salary

💰 €5,000 per month

Job Level

Senior

Tech Stack

AWSCloudDNSGoLinuxLuaMicroservicesPythonTCP/IPVoIP

About the role

  • Lead the design and maintenance of mission-critical, real-time voice systems
  • Ensure unparalleled reliability, scalability, and security while enhancing voice quality and observability across our global cloud infrastructure
  • Design, develop, and maintain high-performance SIP and RTP-based VoIP systems, serving as the subject matter expert on core VoIP protocols
  • Utilize expert-level skills to diagnose and resolve complex routing, codec, and signaling issues using packet captures (Wireshark), logs, and SIP traces
  • Proactively optimize network performance across critical protocols (SIP, RTP, TCP/IP, DNS, NAT, and firewall rules)
  • Integrate, support, and ensure seamless interoperability between PBX systems, SBCs, and modern cloud VoIP environments
  • Define, monitor, and aggressively improve call quality metrics (MOS, jitter, latency) through proactive performance tuning
  • Lead the technical architecture and deployment of advanced voice applications, including real-time transcription, AMD/VMD (Answering Machine Detection), and next-generation AI-driven voice features
  • Act as the final point of technical escalation for intricate VoIP incidents, effectively coordinating with internal teams and external vendors

Requirements

  • 6+ years in software engineering
  • Minimum of 4 years dedicated to VoIP/SIP development
  • Deep hands-on experience with core VoIP infrastructure components, specifically Freeswitch and Kamailio
  • Proficiency in scripting and development with Lua and Python
  • Experience with Go or C/C++ is a significant plus
  • Expert-level command of network protocols and advanced debugging tools (Wireshark, SIPp, libpcap, Linux/BSD sockets)
  • Practical experience with WebRTC, configuring and managing TURN/STUN servers, and deploying solutions on major cloud platforms (AWS, Google Cloud, Cloudflare)
  • Understanding of traditional telecom hardware, including GSM, E1 gateways, and serial-connected devices
  • Proven track record in building highly scalable systems and implementing effective automated testing frameworks
  • Hands-on knowledge of call flow simulation tools and SIP testing frameworks (Nice-to-Have)
  • Experience designing and implementing RESTful APIs and scalable microservices (Nice-to-Have)
  • Familiarity with global network routing principles and optimization techniques (Nice-to-Have)
  • Experience with embedded systems or SIP hardware devices (Nice-to-Have)
  • Background in implementing AI/ML-driven features within VoIP solutions (Nice-to-Have)

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard skills
VoIPSIPRTPLuaPythonGoC/C++WebRTCRESTful APIsmicroservices
Soft skills
leadershipproblem-solvingcommunicationtechnical escalationcollaboration