VoIP Software Engineer (Asterisk) at IDT

IDT Corporation is looking for a Middle VoIP Engineer with a focus on Asterisk. The team is building a cloud PBX solution based on Kamailio and Asterisk (net2phone). We expect you to have strong problem-solving skills, be self-motivated, proactive, and responsible. Your daily duties will include implementing PBX 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, Kamailio, RTPEngine, Java, Kafka, MySQL, MongoDB, CDK, and GitHub Actions pipelines. You will work with automated CI/CD processes and get a chance to improve your knowledge of SIP, cloud infrastructure, and networks. We are looking for a person with: • At least 5 years of experience in Asterisk: you know what are UAC, UAS, PJSIP, channel, call park, blind/attendant transfer, etc. • Experience with Asterisk dialplan in Lua. • Solid SIP knowledge. • 3+ years experience in coding. • Experience in Linux environment. • Good level of English (B2 or higher). Responsibilities: • High-Scale Asterisk: Build and maintain cloud PBX features within a large-scale ecosystem (60k+ users) using Asterisk, Kamailio, and RTPEngine. • Advanced Dialplan Development: Design and implement complex telephony logic specifically using Asterisk dialplans in Lua. • Deep Troubleshooting & Bug Fixing: Analyze stack traces and performance bottlenecks to fix bugs in Asterisk source code and contribute to the community. • Protocol & SIP Proxy Management: Manage complex SIP/RTP flows, SDP negotiation, and NAT traversal for resilient and scalable telephony clusters. • System Maintenance & Reliability: Optimize Linux environments, manage PSTN routing/failover, and participate in on-duty rotations to resolve outages. What We Offer: • Remote b2b or hybrid / remote (Belarus-Moldova) work opportunity! • Stable job with long-term growth perspective. • Competitive salary with annual performance review. • Really good hardware. • An exciting and challenging job with talented people around. • Continuous learning and career growth opportunities. • 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. • More perks for the Minsk and Chisinau office employees. IDT Corporation is a global communications company founded in 1990 and headquartered in Newark, New Jersey. We are industry leaders in prepaid communication and payment services and one of the largest international voice carriers. We are listed on the NYSE, employ over 1800 people across 20 countries, and have over $1.5 billion in revenues.  We are not "another big IT corporation"- we encourage and support in-house entrepreneurs in developing their ideas into business actions. Net2Phone is a rapidly growing global provider of unified cloud communications solutions. It solves the problem of cost optimization for businesses in more than 50 countries, providing them with high-quality VoIP services. Net2Phone provides businesses with an integrated communications suite featuring powerful collaboration tools such as voice, messaging, chat, and unlimited domestic and international calling to 23+ countries.  The product was named ‘VoIP Supplier of the Year’ by the Telecom Consulting Group in 2018.