Sr. VoLTE​/IMS Test Engineer – 5G​/LTE Core Networks-Onsite

Role Overview

Cognizant is looking for a test lead engineer that has 6-8 years experience SIP, IMS Core, VoLTE/CVoIP call flow process for testing and validation.

• Strong knowledge in 5G/LTE/UMTS
• VoLTE/IMS Network Performance and Capacity Test and IMS Nodes Performance Benchmarking Activities.
• Extensive Hands on experience with VoLTE/IMS Call Processing and VoLTE/IMS Supplementary Services.
• Need to have hands on experience IMS Related Protocols Signaling Analyzing (VoLTE/IMS, VOIP Call Flows (SIP/SDP/H.248 etc.) using Iris Analyzer and RADCOM .
• Working experience on IMS interworking entities (BGCF, MGCF, MRFC, MRFP, AGW, IBCF, TrGW) and interfaces.
• VOIP / IMS call flows (expertise in SIP based call flows) - Voice and Supplementary Services.
• Experience with LTE core system interfaces and protocols such as S1-MME, S1-U, S6a, S11, S5/S8, Rx, NAS, S1-AP, RRC, GTPv2c, GTP-U, SGs-AP, Gn, Gx, Ga, Sy is desired
• In-depth understanding of Telecom Protocols and technologies like GTPV2,SIP, RTP, IPv4 and IPv6, DIAMETER, DNS, H.248, IPSec, TCP-IP, LDAP, etc.
• Design & Troubleshooting experience in VoLTE E2E Call Flows and RCA Debugging Skills and IP Network design, planning and optimization
• Scripting experience on any language like Python/Unix/Selenium and hands on experience on Android adb command for automation and taking device logs
• Tool Experience on Wireshark,QXDM,RADCOM,IXIA,EXPO,LANDSLIDE etc

• Applications will be accepted until June 4th , 2026

• $84,000 – $117,000 per year
• Bonus + Comprehensive Benefits

• Onsite role
• Visa sponsorship is not available now or in the future. Candidates requiring sponsorship will not be considered.

• Medical/Dental/Vision/Life Insurance
• Paid holidays plus Paid Time Off
• 401(k) plan and contributions
• Long-term/Short-term Disability
• Paid Parental Leave
• Employee Stock Purchase Plan

Please note, this role is not able to offer visa transfer or sponsorship now or in the future.