1 day ago
Sydney, AustraliaSenior
Responsibilities
- Lead L2/L3 investigations and resolve complex customer issues across 5G UDM and CCxx Cloud Core applications, including CCSM, CCDM, and CCRC.
- Own critical incident response, fault isolation, service restoration, and root-cause analysis in live carrier-grade customer environments.
- Analyze logs, network flows, trace data, system behavior, and distributed-platform performance to improve network stability and prevent repeat faults.
- Collaborate with product, project, service delivery, IMS, EPC/5GC, RAN, and BSS/Charging teams on cross-domain issues.
- Provide customer and stakeholder updates, technical guidance, resolution plans, RCAs, and impact analysis during high-priority incidents.
- Drive operational efficiency through automation, documentation, knowledge sharing, mentoring, and continuous improvement.
- Troubleshoot cloud-native 5G Core issues involving registration, slice selection, service discovery, routing, scaling, upgrades, installations, and expansions.
Requirements
- Deep understanding of UDC/UDM architecture, including CUDB/UDR, HLR-FE, HSS-FE, EIR-FE, CCRC, CCSM, CCDM, subscriber data models, replication, and subscription flows.
- Strong knowledge of Diameter interfaces including S6a/S6d, Cx, Sh, Gr, SLh, and Ud, plus MAP and 5G UDM Nudm interfaces.
- Practical experience troubleshooting HLR-FE, HSS-FE, and EIR-FE behavior across attach, registration, authentication, subscription, barring, roaming, and IMEI-check scenarios.
- Strong platform and cloud troubleshooting skills across network functions, pods, instances, Kubernetes, containers, Linux, YAML configuration, alarms, KPIs, CPU, RAM, and disk.
- Experience with CCDM/CUDB provisioning and data operations, including order flows, bulk operations, migrations, consistency checks, subscriber-data correction, and rollback planning.
- Solid incident, change, and problem management skills, with the ability to document and explain complex UDM/UDC findings clearly.
- Knowledge of 5GC/CCRC interactions with NRF, NSSF, DNS, and SBI/HTTP2, as well as geo-redundancy, database synchronization, system expansion/reduction, installation, and upgrades.
- Ability to troubleshoot Kubernetes and network-function logs across cloud-native 5G Core environments.
- The posting seeks an experienced, technically strong, customer-focused engineer able to operate effectively during high-pressure incidents.
Tech Stack
Categories
Site Reliability
About Ericsson
Ericsson is a publicly traded telecommunications vendor that builds mobile network infrastructure (RAN, core, OSS/BSS), cloud platforms, and managed services for communications providers and enterprises. Founded in 1876 and headquartered in Kista, Stockholm, it supplies 5G systems to operators worldwide and owns Vonage, expanding network APIs and enterprise communications offerings.