5G Device & Protocol Engineer
Active Alliance · Bellevue, WA · 4 days ago
Quality AssuranceFull-time
Job Type: Contract • Domain: Telecom / Wireless • Experience: 5+ years preferred
Responsibilities
- Analyze 5G NR/LTE network performance and perform root-cause analysis (RCA).
- Troubleshoot VoNR, VoWiFi, IMS, and SIP call flows end-to-end.
- Perform protocol-level debugging across RRC, NAS, SIP, IMS, PDCP, RLC, and HARQ.
- Analyze key performance indicators including DL/UL throughput, latency, jitter, packet loss, BLER, and MCS.
- Perform log and trace analysis using QXDM, QCAT, Wireshark/PCAP, XCAL/XCAP, or similar tools.
- Validate device and network performance in live-network and field environments.
- Develop KPI reporting and automation using Python, SQL, Tableau, Power BI, or similar tools.
- Identify network/device performance issues, conduct RCA, and provide recommendations for optimization.
- Collaborate with device, modem, network, and engineering teams to resolve protocol and performance issues.
Required Skills
- Strong knowledge of 5G NR/LTE architecture and protocol stack.
- Hands-on experience with VoNR, IMS, SIP, and end-to-end call-flow troubleshooting.
- Strong experience in protocol debugging, KPI analysis, log analysis, and network RCA.
- Experience with QXDM, QCAT, Wireshark/PCAP, XCAL/XCAP, or equivalent tools.
- Strong understanding of RRC, NAS, PDCP, RLC, HARQ, SIP, and IMS protocols.
- Experience with Python scripting/automation and network analytics.
- Experience analyzing throughput, latency, BLER, MCS, packet loss, and other 4G/5G KPIs.
- Strong troubleshooting, analytical, and communication skills.