Telephony Tester

TechDigital Group; San Jose (CA); On-site; USD 90,000 - 120,000; Full time

Job summary

A leading telecommunications company in San Jose is seeking a skilled tester with expertise in 5GNR, LTE, and IMS/VoLTE standards. The ideal candidate will have hands-on experience with network carrier testing, debugging skills, and knowledge of commercial test systems. You will be responsible for verifying telephony products, ensuring quality and performance in 3GPP standards. Strong debugging and communication skills are essential.

Qualifications

• Understanding of 5GNR/LTE/UMTS protocols and testing.
• Good knowledge of 3GPP IMS core standards.
• Familiarity with RF testing and mobile phone testing.

Responsibilities

• Test 5G-LTE/UMTS interfaces and protocols.
• Debug issues and provide solutions.
• Use commercial test simulators for product verification.

Skills

5GNR/LTE/UMTS 3GPP Air interface specifications

Network Carrier Testing Experience

IMS/VoLTE Experience

Debugging and root causing issues

Test automation and python scripting

Understanding of Telephony and protocol stack service

Tools

Keysight

R&S

Spirent

Anritsu

Job description

Job Description

• Understanding of 5GNR/LTE/UMTS 3GPP Air interface specifications. Network Carrier Testing Experience, LTE, 5G-NR protocol knowledge at UE side (L1/L2/L3)
• Hands-on experience and knowledge of 3GPP (UMTS & LTE) Layer 2 and Layer 3 protocol and call processing
• IMS/VoLTE Experience is a must
• Must have knowledge of 3GPP IMS core standards. Network Carrier Testing Experience, LTE, 5G-NR protocol knowledge at UE side (L1/L2/L3)
• Good at Debugging and root causing the issues
• Exposure to commercial test simulators and test systems such as: Keysight, R&S, Spirent and Anritsu for wireless telephony product verification
• Familiarity with RF testing, test hardware, mobile phone testing including hardware and android software
• Nice to have test automation and python scripting skill
• Good understanding of 3GPP2 CDMA and 3GPP 5G/4G/3G/2G systems
• Good understanding of Telephony and protocol stack service
• Knowledge of QXDM logs and ADB Commands (must)