Senior/Lead Asterisk Developer

Medium; Warszawa; Remote; PLN 290,000 - 437,000; Full time

Job summary

A leading technology company in Poland is seeking a Senior/Lead Asterisk Developer to build and scale a cloud PBX solution using Asterisk. The role involves designing advanced dialplans, debugging core issues, and working on cloud environments. Ideal candidates have over 7 years of experience in large-scale deployments, a deep understanding of SIP signaling, and a solid background in Linux and CI/CD processes. This position offers remote work flexibility and competitive compensation in USD.

Benefits

Remote work flexibility

B2B contract with competitive compensation

Top-tier hardware

Continuous learning opportunities

Professional development coverage

Access to English lessons

Qualifications

• 7+ years of production experience with large-scale deployments.
• Experience with Asterisk and its core modules.
• Ability to work in cloud environments (AWS preferred).

Responsibilities

• Design and implement advanced Asterisk dialplans.
• Debug and fix issues inside Asterisk core and modules.
• Analyze and troubleshoot SIP flows.

Skills

Problem-solving skills

SIP signaling

C/C++ development

Linux systems

CI/CD processes

Cloud infrastructure knowledge

English (B2 or higher)

Job description

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.

Join us if you:

• 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 offer:

• Remote work flexibility – work from anywhere.
• B2B contract with competitive gross compensation in USD.
• Top-tier hardware to support your productivity.
• A challenging role in a team of skilled professionals.
• Continuous learning and career growth opportunities.
• Coverage for professional development: training, seminars, and conferences.
• Access to high-quality English lessons.