Cognizant

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

Cognizant$84K — $117K *
Telecommunications & Hardware
5 - 7 years of experience
Job Overview by Ladders

Qualifications

  • 6-8 years experience in SIP, IMS Core, and VoLTE/CVoIP testing and validation.
  • Strong knowledge of 5G, LTE, and UMTS technologies.
  • Hands-on experience with VoLTE/IMS call processing and supplementary services.
  • Proficient in IMS signaling analysis with tools like Iris Analyzer and RADCOM.
  • Working knowledge of IMS interworking entities and network interfaces.
  • Experience with LTE core system interfaces and related protocols is desired.
  • Proficient in scripting languages like Python/Unix/Selenium for automation.

Responsibilities

  • Lead testing and validation efforts on SIP and IMS Core technologies.
  • Conduct performance and capacity tests for VoLTE/IMS networks.
  • Analyze and benchmark IMS node performance activities.
  • Troubleshoot and design VoLTE end-to-end call flows.
  • Optimize IP network design and planning for VoLTE services.
  • Utilize tools such as Wireshark and RADCOM for signal analysis.

Benefits

  • 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
Full Job Description
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. Following skills/experience required:
• 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

*Please note, this role is not able to offer visa transfer or sponsorship now or in the future*
  • Applications will be accepted until June 4th , 2026
  • LI#- #LI-SC6

Compensation & Benefits

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

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

Benefits: Cognizant offers the following benefits for this position, subject to applicable eligibility requirements:
• 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

About Cognizant

TriZetto is Powering Integrated Healthcare Management. With technology solutions touching more than half the U.S. population today, TriZetto is uniquely positioned to drive the convergence of core benefit administration, care management and constituent engagement. TriZetto provides premier information technology solutions that enable payers and other constituents in the healthcare supply chain to improve the coordination of benefits and care for healthcare consumers.

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Learn more about Cognizant
Size
340,400 employees
Market Cap
$28.7 billion
Industry
Net Income
$1.3 billion
Founded
1994
5 Year Trend
+6.5%
Revenue
$16.6 billion
NASDAQ

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