Sr. Network Test Engineer Cellular, WiFi & Broadband

Location:

Munich Germany (Onsite Full-Time)

Employment Type:

Permanent

Work Authorization:
Must possess the legal right to work in Germany (e.g. EU citizen German work permit EU Blue Card).

Inabia is seeking a highly skilled Senior Network Test Engineer to support advanced testing across 5G / LTE WiFi and broadband / IP networking environments for a telecommunications client in Munich.

This position combines wireless test engineering with enterprise and broadband networking skills requiring hands‑on experience validating radio IP networking and CPE / gateway performance in both lab and field conditions.

Candidates with strong LTE / 5G RAN or drive‑testing backgrounds who can learn broadband / IP quickly are encouraged to apply.

• Perform end‑to‑end testing for LTE, LTE‑A, 5G NSA / SA and WiFi 5 / 6 / 6E.
• Validate attach / registration, CA EN‑DC, VoLTE / Vo Wi Fi , VoNR handovers, fallback and mobility scenarios.
• Conduct throughput, latency, jitter and packet‑loss testing using standardized benchmarking methods.
• Analyze RAN KPIs and troubleshoot coverage, mobility, capacity and interference issues.

• Test residential and enterprise broadband devices including routers, gateways, mesh WiFi systems, CPEs, modems and home networking equipment.
• Execute performance, reliability and stability tests on broadband / WAN connectivity (fiber, DSL, wireless broadband, Ethernet backhaul).
• Validate LAN / WAN configuration workflows, device onboarding and end‑to‑end connectivity.

• Configure and test IPv4 / IPv6 addressing, subnetting, VLANs, DHCP, DNS, NAT, port forwarding and firewall rules.
• Validate VPN tunnel setup and performance (IPsec, SSL, Wire Guard, OpenVPN).
• Troubleshoot routing, DNS resolution issues, gateway conflicts and Layer 2 / Layer 3 connectivity.
• Use diagnostic tools such as Wireshark, tcpdump, trace route, iPerf and system logs for L2‑L7 debugging.

• Build and maintain lab environments combining 5G / LTE devices, broadband routers, switches, servers, VPN endpoints and test automation tools.
• Ensure test repeatability through proper documentation, version control and environmental consistency.
• Integrate new firmware, OS builds, APNs, SIM profiles and network parameters for testing cycles.

• Use tools such as TEMS X‑Cal, Actix, QXDM / QCAT, Wireshark, tcpdump, iPerf, spectrum analyzers and vendor‑specific utilities.
• Perform advanced log analysis of RRC, NAS, SIP, RTP / RTCP and system logs to identify root causes across wireless & IP layers.
• Validate compliance with KPI requirements, feature acceptance criteria and field performance goals.

• Develop clear test plans, defect reports, KPI dashboards and RCA summaries.
• Collaborate with RAN engineering teams, broadband development teams, device OEMs and network operators.
• Provide input for feature validation, firmware improvements and field issue reproduction.

• Experience in LTE / 5G and / or WiFi network testing, broadband CPE testing, or IP networking validation.
• Strong understanding of IP networking principles (subnetting, routing, VLANs, NAT, firewall rules, DHCP, DNS).
• Hands‑on experience with test tools (e.g., Wireshark, iPerf, tcpdump, TEMS X‑Cal, Actix, QXDM).
• Able to build, configure and troubleshoot complex testbeds across wireless and IP domains.
• Strong analytical and troubleshooting skills across RF, IP and application layers.
• Excellent documentation and communication skills.

• Experience with German or EU mobile operators (Telekom, Vodafone, O2, 1&1) or broadband ISPs.
• Experience testing home networking devices, broadband gateways, WiFi APs or mesh systems.
• Familiarity with enterprise‑grade networking (Cisco, Juniper, Aruba, Fortinet, Ubiquiti).
• Knowledge of VoLTE / IMS / SIP analysis or Vo Wi Fi  / VoNR testing.
• Python or automation scripting experience.