Sr. Test Engineer
Listed on 2026-07-01
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Engineering
Systems Engineer, Wireless / 5G
E2E Service Regression Tester
Location:
Redmond, WA
Client: AT&T
Job description:
Expert knowledge of 5G SA, NSA and LTE call flows from an end-to-end perspective (Device †RAN †Core Network). Expert knowledge of the call flows of services and features such as Voice, Messaging, UCE, UT, USSI, HTTP, VoLTE, Vo Wi Fi , IR92, IR94, AS262 HO, WPS, RTT, N11, International Wi Fi and S8HR. Expert knowledge of VOIP protocols such as SIP, Megaco/H.248, MGCP, DNS, LNP, TCAP, SDP, RTP, DIAMETER, IMS (Audio/Video call signaling, Instant Message, RCS, Presence, Subscription), VoNR, VoLTE / LTE EPC.
Expert knowledge of 5G and LTE EPC core protocols such as GTPV2C, GTPV1C, GTPV1U, S1AP. Experience with and understanding of how NATing and Proxy functions work in a packet core and the implications for connectivity (routing and firewalls) to services platforms. Excellent troubleshooting skills. Strong communication skills (written and oral) and intercultural communication abilities. Ability to articulate complex issues, concepts, solutions, and standards clearly.
Experience with automated testing including simulation and Real UE automation. Win as one attitude, to work as a team to accomplish projects on time with quality.
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