Test Engineer

TechDigital Group; Warrenville (IL); On-site; USD 100,000 - 120,000; Full time

Job summary

TechDigital Group is seeking a Test Lead Engineer with strong expertise in SIP, IMS Core, and VoLTE/CVoIP processes. You should have 6-8 years of experience and a solid grasp of telecom protocols.

The role demands extensive hands-on experience with VoLTE call processing and strong analytical skills related to IMS protocols. You'll work with VoLTE E2E call flows and contribute towards testing and validation projects.

Qualifications

• 6-8 years of experience in SIP, IMS Core and VoLTE/CVoIP.
• Strong knowledge of telecom protocols and scripting.
• Experience analyzing IMS-related protocols.

Skills

5G/LTE/UMTS

VoLTE/IMS Network Performance

IMS Call Processing

SIP protocol signalling

IMS interworking entities

Telecom protocols

IP network design

Scripting in Python/Unix/Selenium

Wireshark

Job description

Test Lead Engineer

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

Required Skills and Experience

• 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
• Experience analysing IMS‑related protocols signalling (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
• 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 and troubleshooting experience in VoLTE E2E Call Flows and RCA debugging skills, plus IP network design, planning and optimization
• Scripting experience in any language such as Python/Unix/Selenium and hands‑on experience on Android adb command for automation and device log collection
• Tool experience on Wireshark, QXDM, RADCOM, IXIA, EXPO, LANDSLIDE, etc.

Top Skills

• IMS call flows
• Telecom protocols and technologies like GTPV2, SIP, RTP, IPv4 and IPv6, DIAMETER, DNS, H.248, IPSec, TCP‑IP, LDAP, etc.
• IMS interworking entities (BGCF, MGCF, MRFC, MRFP, AGW, IBCF, TrGW) and interfaces