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 doDesign 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:Required5+ 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 OpenSIPSProven 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 plusPython 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 roleFully 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.