Senior Voip Engineer - This role sits at the intersection of telecom, networking, and software engineering, and requires practical, production-grade experience across all three. You will contribute directly to architectural decisions, build new services, and improve voice systems that customers rely on every day. This is a developer role not an integrator or operator position. We are looking for someone who has written code that routes, manipulates, and reasons about SIP traffic at scale. What you''ll do- Design and develop services for a production-grade real-time communications platform. - Build and maintain telephony applications using open-source and commercial platforms. - Contribute to and help lead the migration from legacy infrastructure to a modern architecture. - Design and implement call routing logic, SIP signaling flows, and media handling. - Troubleshoot complex issues in live voice environments signaling, media, performance, and reliability. - Partner closely with operations and cross-functional engineering teams to ensure service stability and scalability. What we''re looking for:Required- 5 years as a developer building VoIP / SIP systems not solely operating or integrating commercial platforms. - Hands-on production experience with both layers of an open-source SIP stack:A B2BUA / media server: Asterisk or FreeSWITCHA SIP proxy / routing layer: Kamailio or OpenSIPS- Proven track record building and operating voice platforms in production. - Solid understanding of SIP signaling, dialog state, NAT traversal, and real-time media behavior. - Comfort reading and writing code, not only configuration. - Advanced English proficiency (written and spoken). - Strong analytical and problem-solving skills. Strong plus- Python for automation, tooling, or service development. - SQL and cloud environments (AWS, Azure, or GCP). - Containerization technologies (Docker, Kubernetes). - Event-driven architectures and messaging systems (Kafka, RabbitMQ, NATS). - DevOps and automation tooling (Terraform, Ansible, CI/CD pipelines). - Exposure to RTPengine, Homer SIP capture, WebRTC gateways, or SBCs. - Experience contributing to or maintaining infrastructure-as-code. Why this role- Fully remote with a flexible working model. - Direct ownership of architectural decisions on a platform handling real production traffic. - High-impact migration project your work shapes the next generation of the platform. - Tight, technical team where engineering quality is a first-class concern. - Continuous learning culture with support for training and development.