About the roleWe are hiring a Senior VoIP Engineer to help shape and evolve a large-scale real-time communications platform, including the migration from legacy infrastructure to a modern architecture.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.