VotaryTech - Software Engineer - LTE/IMS Testing

Description

Key Responsibilities

• Perform LTE UE protocol testing using industry-standard tools and real network setups.
• Conduct functional and performance validation of IMS services such as VoLTE, ViLTE, and VoWiFi.
• Execute test cases on mobile handsets across chipset vendors (Qualcomm, MediaTek, Spreadtrum, etc.
• Analyze call flows, message sequences, and KPIs to identify and resolve issues.
• Collaborate with development, modem, and field testing teams to debug and resolve issues.
• Prepare detailed test reports and contribute to system and feature validation documentation.
  

Technical Skills

• Strong understanding of 3GPP standards for LTE, IMS, and VoWiFi.
• Proficient in LTE Layer 3 protocol stack (RRC, NAS, PDCP, RLC, MAC, PHY).
• Hands-on experience with network simulators (e.g., Anritsu, Keysight, R&S, Spirent).
• Familiarity with IMS signaling protocols : SIP, SDP, RTP/RTCP, Diameter.
• Experience working with chipset tools (Qualcomm QXDM, QCAT, MTK Modem Log Tool, etc.)
• Good knowledge of VoLTE call flows, EPS bearer management, and SIP registration flows.
• Understanding of eMBMS, CSFB, and SRVCC procedures is a plus.
  

Preferred Qualifications

• Bachelors or Masters degree in Computer Engineering.
• Knowledge of 5G NR fundamentals will be an added advantage.
• Exposure to Android telephony stack or modem validation frameworks preferred