Senior Lead – VOIP Engineer

Unified-CXM Ireland Limited; Dublin; On-site; EUR 85,000 - 110,000; Full time

Job summary

Unified-CXM Ireland Limited is looking for a Senior VoIP Engineer to design and implement VOIP infrastructure using technologies like FreeSWITCH and Kamailio. With 12+ years of experience in the Telephony/VoIP domain, the ideal candidate will lead VoIP initiatives and troubleshoot live traffic.

Familiarity with cloud-based deployments and strong programming skills in C/C++ are also essential. Join us for an opportunity to contribute to innovative telephony solutions and thrive in a diverse and inclusive workplace.

Qualifications

• 12+ years of hands-on experience in the Telephony / VoIP / CPaaS domain.
• Expert-level understanding of SIP, RTP, NAT traversal, and VoIP security.
• Experience in designing carrier-grade telephony platforms serving millions of calls.

Responsibilities

• Design and implement VOIP infrastructure.
• Architect session border controllers and NAT traversal strategies.
• Troubleshoot live traffic and lead during major incidents.

Skills

VoIP Protocols (SIP/SDP, RTP/RTCP)

Networking fundamentals (UDP/TCP/IP, DNS, MPLS)

C/C++ programming

Troubleshooting skills

Distributed systems knowledge

Problem-solving skills

Tools

FreeSWITCH

Kamailio/OpenSIPs

RTPEngine

Job description

What You’ll Do

• Design and implement VOIP (signaling and media) infrastructure using FreeSWITCH, Kamailio/OpenSIPs, and RTPEngine
• Architect session border controllers (SBC), NAT traversal, load balancing, and failover strategies
• Define standards for call routing and audio quality optimization (codecs, jieer, etc.)
• Lead initiatives for scalability, observability, security, and resiliency of our voice infrastructure
• Troubleshoot live traffic and provide technical leadership during major incidents
• Collaborate with Backend and API teams to design provisioning, billing, and call analytics APIs
• Evaluate and onboard open‑source tools or commercial carriers as needed
• Coach and mentor junior/lead engineers in VoIP best practices

What Makes You Qualified?

• 12+ years of hands‑on experience in the Telephony / VoIP / CPaaS domain
• Strong knowledge of VoIP Protocols (SIP/SDP, RTP/RTCP), Networking fundamentals (UDP/TCP/IP, DNS, MPLS), QoS (latency, jieer, packet loss)
• Hands‑on experience with Session Border Controller (SBC), Media Servers and WebRTC
• Expert‑level understanding of SIP, RTP, NAT traversal (ICE/STUN/TURN), and VoIP security (TLS, SRTP, fraud preven8ion)
• Hands‑on development experience with FreeSWITCH, Kamailio/OpenSIPs, and RTPEngine
• Experience in designing carrier‑grade telephony platforms serving millions of calls
• Strong systems programming and debugging skills in C/C++
• Strong troubleshooting skills, with experience using network monitoring and debugging tools
• Familiarity with distributed systems and cloud‑based deployments (AWS, GCP, Azure)
• Excellent problem‑solving, debugging, and performance tuning skills

To be Successful

• Hands‑on experience in C/C++ development for real‑time systems
• VoIP protocols: SIP signaling, SDP negotiation, RTP/RTCP media handling
• Media servers: FreeSWITCH, Kamailio/OpenSIPS, or RTPEngine
• Carrier‑grade telephony infrastructure: SBCs, NAT traversal (ICE/STUN/TURN), and securing voice traffic with TLS/SRTP
• Cloud contact center or CPaaS platforms, including PSTN/SIP trunking and global carrier integrations

Equal Employment Opportunity

Sprinklr is a proud equal‑opportunity employer and complies with all federal, state, and local laws regarding equal employment opportunity. We provide reasonable accommodations upon request and are committed to diversity and inclusion.