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About the Role

Ericsson is seeking an experienced Support Engineer to join a CCxx/UDM support team within MOAI NEO, focusing on 5G Core and Cloud Core solutions for NACI customers. This role involves supporting complex L2/L3 incidents, enhancing live network stability, and collaborating with various teams to minimize outages and ensure safe introduction of new CCxx releases. The position directly supports Ericsson's mission of delivering reliable, high-performing 5G Cloud Core solutions.

Responsibilities

Lead L2/L3 investigations and drive resolution of complex customer issues across 5G UDM and CCxx Cloud Core applications.
Own critical incident response, fault isolation, and service restoration activities in carrier-grade, customer-facing environments.
Analyze system behavior, logs, network flows, and distributed platform performance to identify root causes and prevent repeat faults.
Partner with product, projects, service delivery, and problem management teams to improve service stability and safely introduce new CCxx releases.
Communicate confidently with customers and internal stakeholders, providing clear updates, technical guidance, and resolution plans during high-priority incidents.
Drive operational efficiencies through automation, knowledge sharing, documentation, mentoring, and continuous improvement initiatives.

Requirements

Clear understanding of the overall UDC/UDM solution, including CUDB/UDR, HLR-FE, HSS-FE, EIR-FE, CCRC, CCSM, and CCDM interdependencies.
Knowledge of subscriber data models in CUDB, including keys, indexes, replication, and subscription change flow.
Strong Diameter skills, including S6a/S6d, Cx, Sh, Gr, SLh, and Ud-type interfaces.
Awareness of 5G UDM interfaces such as Nudm, enabling trace reading and error mapping.
Understanding of FE behavior (HLR-FE / HSS-FE / EIR-FE) in various scenarios like attach, RAU/LAU, EPS attach, IMS registration, authentication, subscription download/update, barring/roaming, and EIR IMEI checks.
Familiarity with CCSM concepts, including NFs, pods, instances, scaling, Day-0/Day-1 parameters, and Diameter endpoints.
Proficiency in Linux and basic Kubernetes/container troubleshooting, including logs, pods, CPU/RAM/disk analysis.
Understanding of CCDM order flows, typical failures, bulk operations, migrations, and ability to perform subscriber-data corrections.
Solid incident, change, and problem management capability, including strong case notes, clear RCAs, and impact analysis.
Ability to work across IMS, EPC/5GC, RAN, and BSS/Charging teams.
Understanding of the role of CCRC with NRF, NSSF, DNS, and SBI/HTTP2 in 5G Core.
Strong Linux skills.
OpenStack basics.
Kubernetes/containers and YAML-based configuration.
Knowledge of NRF/DNS/NSSF behavior, including geo-redundancy, database sync/resync, and system expansion/reduction.
Experience with install, upgrade, and expansion activities.
Experience reading Kubernetes and NF logs.
Experience debugging registration and slice-selection issues.

Skills

5G Core
Cloud Core
L2/L3 Incident Support
Network Stability Improvement
Diameter
MAP
5G UDM Interfaces
CCSM
CCDM
CUDB
Linux
Kubernetes
Container Troubleshooting
OpenStack
YAML
NRF
DNS
NSSF
Incident Management
Change Management
Problem Management
Root Cause Analysis
Automation
Knowledge Sharing
Documentation
Mentoring

Location

Sydney, Australia

Work Type

Full-time

Experience Level

Experienced

About the Company

Ericsson is a world leader in communications technology and services with its headquarters in Stockholm, Sweden. Our mission has always been to help shape a more connected and sustainable world. We believe in innovation, technology leadership and responsible business practices.

Equal Opportunity

Encouraging a diverse and inclusive organization is core to our values at Ericsson, that's why we champion it in everything we do. We truly believe that by collaborating with people with different experiences we drive innovation, which is essential for our future growth. We encourage people from all backgrounds to apply and realize their full potential as part of our Ericsson team. Ericsson is proud to be an Equal Opportunity Employer.