VoIP Engineer

Who We Are:   At Bandwidth, we shape how the world connects. We're the global communications software company and Tier 1 network operator with global reach.  The voice, messaging, and emergency services infrastructure behind the brands and apps you use every day. Because we own the network we build on, the problems you'll solve here are bigger, more complex, and more impactful. And as communications shifts to AI, we're the infrastructure layer making it possible. We call ourselves BANDmates because building something this big takes collaboration, different perspectives, and the freedom to bring your authentic self to the table. We're experts who speak like humans. Ready to build what's next? #JoinTheBand What We Are Looking For: We are seeking a VoIP Engineer with a modern engineering mindset to join Bandwidth's Network Operations team. You possess expertise in SIP and carrier-grade environments, and are driven to maintain the highest levels of quality. This role is critical for ensuring reliable, secure SIP connectivity across multiple carrier platforms and enterprise environments. What You'll Do: Carrier Interconnectivity: Test, deploy, and maintain SIP solutions with global carriers to ensure reliability, compliance, and optimal routing. System Integration: Collaborate with R&D teams to integrate SIP services from SBC edge to custom voice core. Maintain Voice Infrastructure: Deploy, Upgrade, and Maintain our Core Voice infrastructure, including our SBC’s and policy servers. Serve in an on-call rotation for urgent, high visibility issues. Work Automation: Build and implement scripts to reduce operational burden, replacing manual workflows. Documentation: Maintain "Documentation as Code," including SIP call flow diagrams, as well as troubleshooting and other functional procedures. Advanced Observability: Act as an escalation point for complex SIP/RTP problems. Use advanced tools like Empirix, Wireshark, SIPp, and HEPIC to analyze call flows and media streams What You Need: Experience: 2-3 years of hands-on VoIP engineering experience, with a heavy emphasis on carrier-grade SIP environments. SIP Mastery: Expert-level knowledge of SIP signaling (INVITE, BYE, etc.), SDP negotiation, and RTP/RTCP. Scripting Toolkit: 1-3 years of proficiency in Python, Bash, Ansible, or Github for automating provisioning and troubleshooting workflows. VoIP Infrastructure: Hands-on experience with maintaining and upgrading traditional SBCs (i.e. Ribbon), along with familiarity with open-source technologies (e.g., Kamailio, OpenSIPS). Diagnostics: Proficiency with diagnostic tools such as Empirix, Wireshark, SIPP, sngrep, and Homer/HEP.   Bonus Points: Carrier Expertise: Direct experience with carrier-to-carrier SIP interconnects and carrier-grade voice network design. Routing & Databases: Experience with Least Cost Routing and complex routing logic. Voice Security: Familiarity with TLS, SRTP, and regulatory compliance including STIR/SHAKEN an...