Test Engineer – Core Network Testing
Core
Validate and assure Core Network services across virtualized telecom environments for leading operators and vendors.
Role type
Senior IC Test Engineer (Telecom Core Network)
Builds
Core Network testing projects involving subscriber management, voice services, mobility, and charging.
Domain
Telecom / Core Network / Virtualized Environments
Required skills
Core Network architecture, SDM, CNDB, IMS, HSS/UDR, SBC, PCRF/PCF, OCS, MGCF, MSC-S, VoLTE, VoWiFi, SRVCC, SIP, Diameter, Wireshark, sngrep, SIPp, Spirent, Keysight IxLoad, Python, Robot Framework, JIRA, SQL, CDR/EDR validation, ElasticSearch
Preferred skills
TestRail, OSS/BSS integrations, telecom security, lawful intercept
Technologies
SDM, CNDB, IMS, HSS/UDR, SBC, PCRF/PCF, OCS, MGCF, MSC-S, Wireshark, sngrep, SIPp, Spirent, Keysight IxLoad, Python, Robot Framework, JIRA, TestRail, ElasticSearch
Responsibilities
Validate subscriber provisioning, registration, authentication, and service profile management. Perform end-to-end validation of voice and IP-based services (VoLTE, VoWiFi, SMS over IP). Execute subscriber registration, attach, deregistration, and SIP signalling validation. Validate mobility scenarios including SRVCC and LTE/5G to Wi-Fi handovers. Verify subscriber provisioning, policy enforcement, and service trigger configurations. Test integrations between Core Network elements and platforms (SDM, CNDB, HSS/UDR, PCRF/PCF, SBC, OCS, MGCF, MSC-S, OSS/BSS, CRM, billing). Perform regression testing following software upgrades and patches. Validate CDR/EDR generation for voice, video, messaging, roaming, and supplementary services. Verify prepaid and postpaid charging, policy enforcement, and online charging functionality. Conduct performance, stress, load, failover, and high-availability testing. Monitor and analyse latency, call setup times, throughput, signalling behaviour, and overall system performance. Develop and maintain automated test suites. Log, track, and prioritise defects using JIRA. Collaborate with developers, Core Network engineers, operations teams, and client stakeholders. Produce clear test reports, KPIs, and recommendations.
Seniority
Mid-Senior, hands-on IC