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Posted 7 months ago

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Senior/Lead VoIP (Asterisk) Engineer

WarsawRemoteFull-time

AI Summary

Senior/Lead Asterisk Developer responsible for designing and implementing advanced Asterisk dialplans, debugging core components, and contributing to a cloud PBX platform. Leads technical decisions and collaborates across teams to ensure scalable, HA telephony deployments.

About this role

We’re looking for a Senior/Lead Asterisk Developer to help us build and scale a cloud PBX solution based on Asterisk.
The team is building a cloud PBX solution based on Asterisk. We expect you to have strong problem-solving skills, be self-motivated, initiative, and responsible.
Your daily duties will include implementing different SIP proxy features using Asterisk with respect to high availability and scalability.
You are not limited to Asterisk — we welcome you to be involved in all parts of a large ecosystem built around Asterisk.
You will work with automated CI/CD processes and get a chance to improve your knowledge in cloud infrastructure and networks.

In this role, you will also:

  • Design and implement advanced Asterisk dialplans.
  • Debug and fix issues inside Asterisk core, modules, and C-based extensions.
  • Analyze and interpret stack traces, crashes, memory issues, and performance bottlenecks.
  • Implement patches, backports, or enhancements directly in Asterisk source code.
  • Develop custom modules (C/C++), when needed.
  • Apply deep understanding of SIP signaling, RTP, SDP negotiation, codecs, and NAT traversal.
  • Troubleshoot SIP flows.
  • Work with trunk groups, carriers, PSTN routing, and failover logic.
  • Work with Linux systems (systemd, networking, tuning, kernel parameters).
  • Work with Asterisk in cloud environments (AWS preferred).Participate in architecture decisions for resilient and scalable telephony clusters.

    • Requirements:

  • Have at least 7+ years of production experience with large-scale deployments (call servers with 60k+ active users).
  • Have contributions in https://github.com/asterisk/asterisk/.
  • Have experience with CI/CD, clouds, Linux & networking.
  • Have a good level of English (B2 or higher).
  • (For Lead level) Are ready to act as the technical lead for the Asterisk domain.
  • (For Lead level) Can work cross-team with backend developers, infra/DevOps, QA, and product owners.
  • (For Lead level) Own best practices, code quality, and documentation.

    • We are pleased to offer:

  • Remote work flexibility – work from anywhere.
  • B2B contract with competitive gross compensation in USD.
  • Stable job with long-term growth perspective.
  • Really good hardware.
  • An exciting and challenging job with talented people around.
  • Continuous learning and career growth opportunities with annual performance review.
  • Compensation for professional training, seminars, and conferences.
  • Referral program – get rewarded for helping us grow the team with talented people.
  • Company-supported English classes to enhance your professional growth.

    • Skills

    AsteriskAsterisk DialplansAWSC++CarriersCI/CDCI/CD PipelinesCloud EnvironmentsCodecsDebuggingDiagnosticsGitHub Contributions (asterisk/asterisk)High AvailabilityLinuxNAT TraversalPerformance TuningPSTN RoutingRTPSDPSIPSystemdTelephonyTrunk Groups

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