L3 Network Engineer

Madre Integrated Engineering | Full time

• Provide L3 escalation support as the Voice/VoIP subject matter expert; install, configure, troubleshoot, and maintain ISDN PRI and SIP CPEs, voice gateways, ESBCs, and their NMS/EMS platforms
• Lead technical projects for new systems and upgrades; run POCs, interoperability testing, and integrations with third-party communication platforms
• Work with backend teams, vendors, and IT to resolve customer issues; manage vendor relationships and SLAs
• Perform scheduled maintenance, tuning, and firmware security checks; follow Incident and Change Management processes; document support procedures for audit
• Support capital budget planning (BOM/BOQ) and cost optimization; provide after-hours on-call support

• Bachelor's Degree in Computer Science, Electronics & Telecommunication, or IT
• 7+ years supporting Cisco IPT or similar platforms — UCCE/UCCX, voice gateways, ESBCs, Cisco HCS, and vCenter/vSphere
• Strong knowledge of ISDN PRI, E1/T1, SIP, VoIP, H.323, RTP; hands-on with Ribbon and Nuera ESBCs/gateways and Teams Direct Routing
• Deep-dive troubleshooting using SIP captures, call traces, and CDRs; knowledge of dial plans, trunks, DIDs, and call routing; basic Linux (RHEL/CentOS)
• ITIL and Project Management knowledge; contact center experience is an advantage