Modem Test Engineer
Company: INFOSYS NOVA HOLDINGS LLC
Location: San Diego
Posted on: February 21, 2026
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Job Description:
Job Description Job Description JD - SD Modem Test Engineer Role
Location: US - San Diego Role & Responsibility 12 years of
progressive experience in software testing and quality assurance,
with at least 8 years focused specifically on
IMS/VoNR/VoLTE/VoWiFi/5G UE testing and automation development
Strong, in-depth understanding of the IMS architecture, call flows,
interfaces, and key protocols such as SIP, Diameter, RTP/RTCP
Develop & Deploy the automation solution for manual test plans and
test cases for IMS features (VoNR, VoLTE, ViLTE, VoWiFi, RCS) and
Modem functionalities (call processing, data throughput, mobility,
power consumption), adhering to 3GPP specifications and protocols.
Exceptional knowledge of IP networking (TCP/IP, VLANs, routing,
firewalls). Proficient in developing automated test cases via
frameworks like Google LTP, with strong root cause analysis skills
for script/infrastructure failures. Possesses excellent knowledge
of TCP flows and data communication. Exceptional knowledge of test
equipment platforms such as Anritsu, RNS with preference of
Amarisoft system and work with Vendors to manage and maintain the
equipment issues and software patch upgrade. Perform weekly
regression, sanity, feature-specific, and performance testing to
ensure the quality and stability of new software releases. Isolate,
reproduce, and accurately report defects using bug tracking systems
such as Buganizer. Ability to isolate the test failures arising
from Infrastructure,scripts or the Wireless/IMS protocol stack and
diligent verification of resolved issues. Collaborate with
development and integration teams to analyze test failures using
tools such as ShannonDM, QXDM, or similar proprietary tools,
identifying the root cause of issues related to signaling, protocol
failures, or performance. Mandatory Minimum Bachelor's Degree in
Telecommunications Engineering or Computer Science Proficient in
Callbox testing, including Amarisoft TE,Keysight,R&S.
Experience in modifying/executing the TE scripts. Understanding of
mobile telecom concepts based on 3GPP standards and protocols, and
knowledge of basic call flows in 3G, LTE, VoLTE and 5G Proficiency
in Python, Java. Experience in wireless modem (3G, 4G, 5G) protocol
testing with mobile handsets. Mobile app testing- Android Well
versed with LTE, NR callflows. Knowledge of IMS Core, SIP packets
is a huge plus. Troubleshooting skills, review failure result and
identify the root cause Multi-tasking capability
Keywords: INFOSYS NOVA HOLDINGS LLC, Buena Park , Modem Test Engineer, IT / Software / Systems , San Diego, California
