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Larsen & Toubro • Bengaluru, Karnataka, India
Role & seniority: Senior/Lead 4G/5G Cellular Certification Testing Engineer
Stack/tools: 4G/5G protocol, RF, and application testing; PTCRB, GCF, FCC, carrier certifications; LTE/LTE-A/5G NR; test tools: Anritsu, Keysight, R&S, Spirent; automation: Python (or Shell/Perl/JavaScript); logs: QXDM, QCAT, QTRACE, Wireshark; test frameworks; 3GPP protocol stack; CI/CD: Jenkins, Git (nice-to-have)
Lead end-to-end certification cycles (PTCRB, GCF, FCC, carrier certs)
Design/implement automated test scripts and frameworks for cellular device testing
Perform manual and automated testing of 4G/5G protocol, RF, and application functions; conduct regression, IoT/interoperability, and field testing; analyze logs
10+ years in 4G/5G mobile device testing and certification
Experience with PTCRB, GCF, FCC, and at least one US carrier certification
Strong LTE/LTE-A and 5G NR (NSA/SA), VoLTE/VoNR knowledge
Proficiency with test tools (Anritsu, Keysight, R&S, Spirent)
Automation scripting (Python preferred; Shell/Perl/JavaScript acceptable)
Log analysis and debugging (QXDM, QCAT, Wireshark); solid understanding of 3GPP stack
Experience with major chipset vendors (Qualcomm, MediaTek)
Prior test automation framework work for embedded/mobile devices
Knowledge of test case management and CI/CD tools (Jenkins, Git)
Location & work type: Location not specified; Work type: Full-time
Perform manual and automated testing of 4G/5G protocol, RF, and application level functionalities. Lead and execute certification testing processes including PTCRB, GCF, FCC, and carrier certifications (AT&T, Verizon, TMO, etc.). Design and implement automation test scripts and frameworks for cellular device testing (using Python or other scripting languages). Conduct regression, stability, IOT (Interoperability Testing), and field testing using test tools and automation setups. Debug and analyze logs using QXDM, QCAT, QTRACE, Wireshark, and similar tools. Collaborate with cross-functional teams including development, QA, certification labs, and carrier teams to address and resolve test issues. Maintain detailed documentation for test plans, test cases, defect logs, and certification reports.
years of hands-on experience in 4G/5G mobile device testing and certification.
Experience with PTCRB, GCF, FCC, and at least one US carrier certification process. Strong understanding of LTE, LTE-A, 5G NR (NSA/SA), VoLTE, VoNR technologies. Proficiency in using test tools such as Anritsu, Keysight, R&S, Spirent, etc. Experience with automation testing frameworks and scripting languages (preferably Python, but Shell, Perl, or JavaScript also valued). Hands-on experience with log analysis tools (QXDM, QCAT, etc.) and debugging protocol/RF issues.