Cellular Test Engineer

Day-to-Day Responsibilities Cellular Test Engineer (5G NR / LTE)

Test execution & validation

• Execute conformance, functional, and regression test campaigns on 5G NR (SA/NSA) and LTE devices, covering RRC/NAS signaling, mobility, carrier aggregation, and data-throughput scenarios.
• Validate radio protocol behavior against 3GPP specs and log findings with clear reproduction steps.
• Run RF performance measurements (TX power, sensitivity, EVM, spurious emissions, throughput vs. signal level) and compare results against product requirements.

Automation on CMX/CMW

• 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.

Lab bench & hardware debug

• 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.

Debug & cross-functional work

• 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.

Reporting & continuous improvement

• 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.

Must Have Skills

• The ideal candidate has hands-on experience with cellular testing across both 5G NR and LTE technologies, including radio protocol validation, 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 - engineer experience.
• Former MAANG experience is best.
• Engineering degree preferred.