Job Title:Wireless Systems Embedded Firmware Engineer III
Minimum Qualifications:- The ideal candidate has hands-on experience with cellular testing across both 5G New Radio (NR) and Long-Term Evolution (LTE) technologies, including radio protocol validation, Radio Frequency (RF) performance, and conformance/functional test execution.
- They should be proficient with test automation on CMX (Rohde & Schwarz CMX500/CMW callbox platforms), building and maintaining automated test scripts and regression suites.
- Strong lab bench skills are expected, including confident use of an oscilloscope and related instrumentation for signal integrity, timing, and hardware debug.
- Familiarity with scripting (e.g., Python) for test automation, along with a solid grasp of cellular signaling and measurement fundamentals, will round out the profile.
- Bachelor's degree in Engineering.
Preferred Qualifications:- Master's degree in Computer Engineering or Electrical Engineering.
- Lab engineering experience.
Key Responsibilities:- Execute conformance, functional, and regression test campaigns on 5G New Radio (NR) (Standalone (SA)/Non-Standalone (NSA)) and Long-Term Evolution (LTE) devices, covering Radio Resource Control (RRC)/Non-Access Stratum (NAS) signaling, mobility, carrier aggregation, and data-throughput scenarios.
- Validate radio protocol behavior against 3rd Generation Partnership Project (3GPP) specifications and log findings with clear reproduction steps.
- Run Radio Frequency (RF) performance measurements (Transmit (TX) power, sensitivity, Error Vector Magnitude (EVM), spurious emissions, throughput versus signal level) and compare results against product requirements.
- Build, maintain, and extend automated test scripts and suites on Rohde & Schwarz CMX500/CMW callbox platforms.
- Own the nightly/weekly automated regression pipeline: monitor runs, triage failures, and keep the suite green as firmware drops land.
- Develop Python tooling for test sequencing, instrument control, result parsing, and reporting; reduce manual test time through incremental automation.
- Set up and operate lab benches: callboxes, spectrum/signal analyzers, power supplies, attenuators, shield boxes, and RF cabling.
- Use an oscilloscope for signal integrity, timing, and power-sequencing debug on device hardware; isolate whether an issue is RF, protocol, or hardware in origin.
- Maintain bench calibration, cable loss characterization, and equipment health; keep test setups documented and reproducible.
- Analyze protocol logs (QXDM/QCAT, modem traces, callbox logs) to root-cause failures and narrow them to a specific layer or component.
- Partner with firmware, RF, and hardware engineers to reproduce issues, verify fixes, and confirm no regressions.
- File, track, and drive defects to closure; escalate blockers affecting release milestones.
- Produce daily/weekly test status summaries: pass rates, new failures, coverage gaps, and blocking issues.
- Contribute to test plan development for new features, chipsets, and bands; expand coverage where automation or scenarios are thin.
- Document test procedures, bench configurations, and known issues so results are repeatable across engineers and sites.
Location: Sunnyvale, CA [Onsite]
Salary Range: The salary for this position is between $147,600 - $197,600 annually. Factors which may affect pay within this range may include geography/market, skills, education, experience, and other qualifications of the successful candidate.
Benefits: The Company offers the following benefits for this position, subject to applicable eligibility requirements: [medical insurance] [dental insurance] [vision insurance] [401(k) retirement plan] [long-term disability insurance] [short-term disability insurance] [5 personal days accrued each calendar year. The Paid time off benefits meet the paid sick and safe time laws that pertains to the City/ State] [10-15 days of paid vacation time] [6 paid holidays and 1 floating holiday per calendar year] [Ascendion Learning Management System]
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Preferred Skills cellular testing
- 5G New Radio
- Long-Term Evolution
- radio protocol validation
- Radio Frequency
- CMX
- Python
Job details Job ID 332991
Role Wireless Systems Embedded Firmware Engineer III
Location Sunnyvale, California, US
Job type Direct Hire
Recruiter Khushi
Email
[email protected] 
