Sr. Network Test Engineer - Cellular, WiFi & Broadband

Bellevue, WA

Full Time

Experienced

Senior Network Test Engineer

Location: Onsite (5 days/week)
Type: Full-time, W-2
Work Authorization: Must be legally authorized to work in the United States without sponsorship.

Position Overview
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.

Key Responsibilities
Cellular / WiFi / Broadband Testing

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.

IP Networking, Routing & Configuration

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.

Test Environment Setup & Management

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.

Tools, Logs & Diagnostic Analysis

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.

Reporting, Documentation & Cross-Team Collaboration

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.

Required Qualifications

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.

Preferred Qualifications

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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How many years of hands-on experience do you have testing telephony networks (VoIP, SIP, RTP, IMS)?*

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This requirement for this role is a 5-day-a-week. Can you commit to this? The office/lab location is in Redmond, WA.*

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Sr. Network Test Engineer - Cellular, WiFi & Broadband

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