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Verified Pay check_circle $90 - $100 per hour
Hours Full-time, Part-time
Location Sunnyvale, CA
Sunnyvale, California open_in_new

About this job

Job Description

Job Description
Job Role: Wireless Systems Embedded Firmware Engineer V (Cellular Validation Engineer)
Location: Sunnyvale, CA (Onsite)
Duration: 12 Months

Key Responsibilities
  • Performance characterization: Plan and run device-level cellular performance tests (throughput, latency, TX power, mobility/handover, power consumption) across LTE, 5G NR (SA/NSA), and legacy RATs as applicable.
  • Lab bring-up: Lead hands-on bring-up of new cellular connectivity on new hardware and software platforms, from first attach and data call through stable, production-ready performance.
  • Chipset configuration: Configure and tune cellular modem/chipset settings at the device level, including band configuration, NV/EFS items, carrier and PLMN settings, APN/PDN setup, and feature enablement (CA, EN-DC, VoLTE/VoNR, PSM/eDRX).
  • Network-side setup: Configure and operate base station emulators and test networks (e.g., Keysight/Anritsu/R&S call boxes, private LTE/5G networks, small cells, or open-source cores) to replicate real-world and corner-case network conditions.
  • Log analysis and root cause: Capture and analyze modem and protocol logs (QXDM/QCAT, PCAP, AT-command traces, network-side logs) to isolate and root-cause failures in attach, registration, RRC/NAS signaling, mobility, throughput, and RF performance.
  • Cross-functional debugging: Work with chipset vendors, RF/antenna, hardware, firmware, and software teams to drive issues to resolution; file and track issues with clear reproduction steps and evidence.
  • Test development: Define test plans and acceptance criteria; build or extend automation scripts for repeatable characterization and regression testing.
  • Reporting: Document results, performance baselines, and debug findings, and present recommendations to engineering and program stakeholders.

Required Qualifications
  • Bachelor's or Master's degree in Electrical Engineering, Telecommunications, Computer Engineering, or a related field.
  • 10 years of hands-on experience in cellular device connectivity, modem integration, or cellular system test.
  • Solid understanding of the end-to-end cellular protocol stack (PHY, MAC, RLC, PDCP, RRC, NAS) and core network procedures for LTE and 5G NR.
  • Strong grasp of cellular concepts: scheduling, link adaptation, power control, and key RF metrics (RSRP, RSRQ, SINR, CQI).
  • Experience configuring cellular chipsets at the device level (e.g., Client, MediaTek, Samsung modules).
  • Proficiency with log extraction and analysis tools such as QXDM / QCAT / PCAT, plus Wireshark and vendor-specific modem tools.
  • Hands-on experience setting up the network side, using base station emulators (Keysight UXM, Anritsu MT8000, R&S CMX/CMW) and/or live or private networks.
  • Proven track record of lab bring-up of new cellular hardware or software and of root-causing complex connectivity issues.
  • Comfortable working with lab equipment: spectrum analyzers, signal generators, RF shield boxes, channel emulators, and power analyzers.
  • Experience with technologies RedCap and low-power optimization.
  • Scripting and automation skills (Python, Bash) for test automation and log parsing.

Must-Have Skills
  • Call box experience demonstrated hands-on work with the base station emulators / call boxes used for cellular validation.
  • Cellular knowledge a minimum of 2 5 years of direct cellular experience (within an overall 10 year career profile).
  • Client chipset experience direct, hands-on work with Client chipsets, which are used across all client's device validation.

Nice-to-have Skills:
  • Industry experience with Client chipsets and Client logs the single biggest differentiator on a resume, since Client logging is used throughout validation.
  • Background at Apple or a major telecom/OEM these profiles tend to carry the relevant Client and cellular device exposure.
  • Test automation experience Python/Bash scripting for repeatable characterization, regression testing, and log parsing.

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Posting ID: 1310143678 Posted: 2026-11-02 Job Title: Wireless Embed Firmware Engineer
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Wireless Embed Firmware Engineer