Sr. Network Test Engineer - Cellular, WiFi & Broadband

Munich, Germany
Full Time
Experienced
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).

Position Overview
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.

Key Responsibilities
Wireless (LTE/5G/WiFi) Testing
  • Perform end-to-end testing for LTE, LTE-A, 5G NSA/SA, and WiFi 5/6/6E.
  • Validate attach/registration, CA, EN-DC, VoLTE/VoWiFi, 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.
Broadband & CPE/Gateway Validation
  • 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.
IP Networking, Routing & VPN Testing
  • Configure and test IPv4/IPv6 addressing, subnetting, VLANs, DHCP, DNS, NAT, port forwarding, and firewall rules.
  • Validate VPN tunnel setup and performance (IPsec, SSL, WireGuard, OpenVPN).
  • Troubleshoot routing, DNS resolution issues, gateway conflicts, and Layer 2/Layer 3 connectivity.
  • Use diagnostic tools such as Wireshark, tcpdump, traceroute, iPerf, and system logs for L2–L7 debugging.
Testbed Setup & Environment Ownership
  • 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.
Tools & Log Analysis
  • 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.
Reporting & Collaboration
  • 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.
Required Qualifications
  • 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.
Preferred Qualifications
  • 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 VoWiFi/VoNR testing.
  • Python or automation scripting experience.



 
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