Voip Engineer

Senior Lead VoIP Engineer

Location: Dublin, Ireland (Hybrid – 3 days/week in office)

Relocation & Visa Sponsorship: Available

About the Role

We are seeking a hands-on Senior Lead VoIP Engineer to drive the architecture, technical direction, and scalability of our next-generation Contact Center as a Service (CCaaS) voice infrastructure. You will design and build carrier-grade, low-latency, and highly available global telephony systems while mentoring engineering teams across the organization.

What You’ll Do

• Architect & Build: Design high-scale signaling and media infrastructure using FreeSWITCH, Kamailio/OpenSIPS, and RTPEngine.
• Core Systems Engineering: Implement robust SBC configurations, NAT traversal (STUN/TURN/ICE), load balancing, and automated failover strategies.
• Quality & Resiliency: Define standards for QoS, call routing, and codec optimization (mitigating jitter and packet loss); drive observability, security (TLS/SRTP, fraud prevention), and high availability.
• Hands-on Leadership: Write and debug performance-critical C/C++ code, lead major incident resolution for live traffic, and mentor mid-to-senior engineers.
• Cross-Functional Collaboration: Partner with Backend, Product, and DevOps teams to integrate telephony APIs, carrier trunking, billing, and call analytics.

What You’ll Bring

• 10–12+ Years in Telephony/VoIP: Deep expertise in carrier-grade CPaaS/CCaaS platforms, PSTN trunking, and global carrier interconnects.
• Core Stack Proficiency: Hands-on development and tuning with FreeSWITCH, Kamailio/OpenSIPS, and RTPEngine.
• Systems Programming: Strong hands-on coding and debugging skills in C/C++ for real-time systems.
• Deep Protocol Knowledge: Mastery of SIP/SDP, RTP/RTCP, WebRTC, NAT traversal, and VoIP security (TLS, SRTP).
• Networking & Cloud: Solid foundation in TCP/UDP/IP networking, packet analysis (Wireshark/sngrep), and deploying distributed VoIP stacks in the cloud (AWS/GCP/Azure).