Vendor Engineer Cellular​/WWAN

Job Title:

Vendor Engineer Cellular / WWAN Validation & Debug

Location:

Redmond, WA
Onsite/ Hybrid/ Remote:
Onsite

Role Overview

We are looking for a highly motivated vendor engineer with strong expertise in cellular technologies (4G/5G) to support device validation, debugging, and certification activities. The candidate will work closely with cross-functional teams (FW, SW, modem, and labs) to ensure robust cellular performance and compliance.

Key Responsibilities

• Perform end-to-end device validation for cellular technologies including LTE, 5G (SA/NSA) features
• Execute and analyze lab and field testing across multiple carriers and network conditions
• Conduct protocol-level debugging using logs (QXDM, MBIM traces, modem logs, etc.)
• Identify, isolate, and root-cause cellular connectivity issues (attach, call drops, data failures, standby behavior)
• Work with internal teams and vendors to triage bugs and drive issues to closure
• Support regression validation and sanity verification.
• Generate test reports, defect summaries, and RCA documentation
• Contribute to improving test coverage, automation, and validation frameworks

• Strong protocol knowledge (3
  
  GPP LTE/5G signaling, NAS/RRC basics, IMS/SIP flows)
• Device testing experience (smartphones, modems, or embedded systems)
• Hands-on experience with cellular test equipment (e.g., call boxes like Anritsu, Keysight, Rohde & Schwarz)
• Experience in log analysis and debugging tools (e.g., QXDM, modem logs, trace analysis)
• Good understanding of cellular call flows, attach procedures, and data connectivity
• Working knowledge of scripting (Python / Power Shell / Bash) for test automation, log parsing, or workflow efficiency