Senior​/Lead VoIP; Asterisk Engineer

Position: Senior/Lead VoIP (Asterisk) Engineer
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
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/Dev Ops, 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

A few words about us:
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.
Net2

Phone 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. Net2

Phone 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.
We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.
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