Network Test Engineer/ Wireless Lab Engineer
Job Description
Network Test Engineer (Callbox / Wireless Lab Specialist)
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Level: L1 (Entry-Level / Early Career)
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Work Location: Mountain View, CA (On-site Lab)
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Key Responsibilities
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Callbox Operation & Test Bed Bring-Up
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Configure, calibrate, and operate industry-standard cellular callboxes (e.g., Anritsu MT8821C / MT8000A, Amarisoft Callbox Classic / Ultimate, Keysight) for RF simulation
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and device verification.
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Set up 4G LTE, 5G NR Standalone (SA), and Non-Standalone (NSA) simulated network cells with varying carrier bandwidths, MIMO configurations, and frequency bands.
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Maintain lab RF cabling, attenuator matrices, splitters, and RF shielding enclosures to ensure interference-free test execution.
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Test Execution & Network Validation
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Execute comprehensive test suites for cellular device bring-up, carrier feature acceptance, and multi-SIM behavior.
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Validate core features including:
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Dual SIM Dual Standby (DSDS) and seamless data switching.
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IMS Services: VoLTE, VoNR, Wi-Fi Calling (VoWiFi), and SMS/MMS over IP.
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Network attach/detach, inter-RAT handovers, cell reselection, and mobility transitions.
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5G Standalone (SA) registration, PDU session establishment, and network slicing behaviors.
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Protocol Log Capture & Triaging
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Collect detailed protocol and system logs using debugging tools such as ADB, QXDM, Wireshark, Shannon Logger, and native Android logging tools.
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Perform first-level log analysis across 3GPP protocol layers (Layer 1 / PHY, Layer 2 / MAC / RLC / PDCP, and Layer 3 / RRC & NAS).
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Identify protocol signaling failures, unexpected call drops, IMS registration errors, or radio link failures (RLF), and submit clear, actionable bug reports with reproducible steps and log snippets to engineering teams.
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Automation & Lab Maintenance
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Run and monitor automated regression test benches using automated test harnesses and device farms.
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Utilize basic scripting (Python / Bash) to automate routine testing workflows, parse log metrics, or execute repetitive callbox commands via SCPI/API.
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Keep callbox firmware, software packages, and SIM/eSIM profiles up to date.
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