Cellular Test Engineer (RAN / Device Testing)

CIS TECHNOLOGIES INC; United States; Remote; USD 120,000 - 160,000; Full time

Job summary

CIS Technologies Inc. is seeking a Cellular Test Engineer (RAN / Device Testing) for a remote, 24-month assignment. You will plan, execute, and validate tests for 5G NR and 4G LTE devices, analyzing protocol logs across PHY to NAS layers and refining test benches.

Responsibilities include field testing, automation development, and collaboration with carrier teams to ensure fixes meet 3GPP standards. Strong Python, log analysis, and RF test experience are essential.

Qualifications

• 3–6+ years hands-on experience in cellular system testing, mobile protocol verification, or RAN integration.
• Strong knowledge of 3GPP specifications (5G NR Release 15/16/17, LTE Advanced Pro).
• Comprehensive understanding of RAN architecture (gNB, eNB, CU/DU split, O-RAN concepts).
• Experience with RF test sets, network emulators, and lab benches.
• Proficiency in Python for test automation and log parsing.

Responsibilities

• Test Execution & Validation: plan, develop, and execute tests for 5G NR and 4G LTE devices.
• Protocol & RAN Analysis: analyze protocol logs; troubleshoot call drops and handovers.
• Lab & Test Bench Management: set up RF test benches and channel emulators.
• Field & Drive Testing: plan and perform field tests and validate KPIs.
• Test Automation: build automated scripts and CI/CD pipelines for regression testing.
• Cross-Functional Collaboration: work with baseband hardware, firmware, and software teams.
• Standards Compliance: apply 3GPP standards to validation strategies.

Skills

5G NR testing

RAN concepts

Python automation

log analysis

Education

Bachelor's or Master's in Computer/Electrical Engineering

Tools

Keysight UXM

CMX500/CMW500

Anritsu MT8821C

Spirent

QXDM/QCAT

Wireshark

Job description

We have a position as a Cellular Test Engineer (RAN / Device Testing) role for Remote. Please find the job description below for this position.

Location: Remote

Duration: 24 Months

Job Responsibilities

• Test Execution & Validation: Plan, develop, and execute functional, performance, throughput, mobility, and regression test cases for 5G NR (SA/NSA, FR1/FR2) and 4G LTE devices.
• Protocol & RAN Analysis: Analyze protocol logs across PHY, MAC, RLC, PDCP, RRC, and NAS layers. Troubleshoot call drops, handover failures, throughput degradation, beam management, and paging issues.
• Lab & Test Bench Management: Set up, configure, and maintain RF test benches, network emulators, channel emulators, and shielding chambers (anechoic/reverberation).
• Field & Drive Testing: Plan and perform field testing, drive testing, and carrier acceptance validation; analyze drive test logs against network KPIs.
• Test Automation: Design, build, and maintain automated test scripts and CI/CD pipelines to streamline regression testing and test bench instrumentation.
• Cross-Functional Collaboration: Partner closely with baseband hardware, firmware, software development, and carrier certification teams to report, triage, and verify bug fixes.
• Standards Compliance: Review and apply evolving 3GPP standards (Release 15/16/17+) and carrier-specific test requirements to internal validation strategies.

Required Qualifications

• 3–6+ years of hands‑on experience in cellular system testing, mobile protocol verification, or RAN integration.
• Solid understanding of 3GPP specifications (5G NR Release 15/16/17, LTE Advanced Pro).
• Comprehensive understanding of RAN architecture (gNB, eNB, CU/DU split, Open RAN / O‑RAN concepts).
• Strong knowledge of L1/L2/L3 protocol procedures (Random Access, Cell Selection/Reselection, Handover/Mobility, Beamforming, Carrier Aggregation, Dual Connectivity [EN‑DC/NR‑DC]).
• Hands‑on experience with wireless test sets and network emulators (e.g., Keysight UXM, Rohde & Schwarz CMX500/CMW500, Anritsu MT8821C/MT8000A, Spirent).
• Proficiency with log analysis and diagnostic tools (e.g., Qualcomm QXDM/QCAT, Shannon DM, Wireshark, Accuver XCAL/XCAP, TEMS Investigation).
• Spectrum analyzers, power meters, RF attenuator matrices, and RF switches.
• Proficiency in Python for test automation, log parsing, and instrument control (SCPI, VISA).
• Experience with version control systems (Git) and bug‑tracking tools (Jira).

Education:

• Bachelor's or Master’s degree in Computer Science, Computer or Electrical Engineering, Mathematics, or a related field.