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Senior Network Test Engineer

United States, Bellevue, WA · Job Posted December 09, 2025
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Job Description

Inabia is seeking a highly skilled Senior Network Test Engineer with deep hands-on experience validating cellular (LTE/5G), WiFi, broadband, and enterprise IP networking systems. This role demands strong technical rigor across RF, IP layers, protocol analysis, broadband connectivity, VPN setup, routing, and end-to-end network performance validation. You will own test planning, test environment configuration, field/lab validation, KPI measurement, and L2–L7 troubleshooting for advanced telecommunications and enterprise-grade network systems.

Job Responsibility

  • Conduct comprehensive testing across LTE, LTE-A, 5G NSA/SA, WiFi 5/6/6E, and residential/enterprise broadband access technologies
  • Validate throughput, latency, jitter, packet loss, QoE, and service continuity across fixed and mobile access
  • Test and evaluate broadband gateways, CPEs, modems, routers, mesh systems, and indoor coverage solutions
  • Perform multi-RAT test scenarios: attach, registration, CA, EN-DC, VoLTE/VoWiFi, VoNR, handovers, fallback, and failover
  • Configure and test IPv4/IPv6 addressing, subnets, VLANs, DHCP, NAT, DNS, and routing behaviors
  • Validate VPN configurations (IPsec, SSL, WireGuard, OpenVPN) including tunnel setup, failover, and throughput impacts
  • Execute test cases involving LAN/WAN routing, QoS, firewall rules, port forwarding, and enterprise-grade security controls
  • Analyze L2–L7 network behavior using tcpdump, Wireshark, iPerf, TR-069/USP, SNMP, syslogs, IP routing tables, and traceroute/pathping
  • Build and maintain multi-node testbeds including 5G CPEs, WiFi APs, broadband gateways, SIM configs, VPN endpoints, and core network simulators
  • Integrate various network elements (UEs, routers, switches, servers) and configure network services to replicate real enterprise and residential environments
  • Automate test workflows where possible and ensure testbed version control, repeatability, and documentation
  • Use tools such as QXDM/QCAT, Wireshark, tcpdump, TEMS, X-Cal, Actix, iPerf, spectrum analyzers to capture and interpret logs
  • Perform advanced log analysis for RRC, NAS, SIP, RTP/RTCP, and IP-layer events to diagnose root causes across RF and IP tech stacks
  • Investigate throughput bottlenecks, packet loss patterns, IP routing anomalies, DNS failures, and misconfiguration issues
  • Produce clear and actionable test plans, test cases, KPI dashboards, defect logs, and RCA reports
  • Work closely with device OEMs, carrier engineering teams, broadband vendors, and enterprise networking teams
  • Provide engineering feedback for firmware updates, feature improvements, certification cycles, and customer escalation scenarios

Requirements

  • 5+ years in telecom or advanced network testing (LTE/5G/WiFi/broadband)
  • Strong knowledge of IPv4/IPv6, subnetting, routing, VLANs, DHCP, DNS, NAT, VPNs, and enterprise network configuration
  • Hands-on experience with broadband gateways, home routers, WiFi APs, 5G/LTE CPEs, or ISP-grade network equipment
  • Proficiency in QXDM, QCAT, Wireshark, tcpdump, iPerf, TEMS, X-Cal, or similar tools
  • Experience testing VoLTE/VoWiFi, IMS, SIP/RTP traffic, mobility, call flows, and service continuity
  • Proven ability to build, manage, and debug complex test environments
  • Strong documentation, troubleshooting, and communication skills
  • Must be legally authorized to work in the United States without sponsorship

Nice to have

  • Experience with carrier broadband deployments, ISP labs, DOCSIS/Fiber, or DSL/Copper access
  • Familiarity with firewall rules, routing tables, ACLs, QoS policies, and enterprise networking best practices
  • Exposure to Python, automation frameworks, or log-parsing scripts
  • Experience working with U.S. carriers, broadband ISPs, or network equipment vendors

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