## About this Opportunity
At Ericsson, we are seeking a knowledgeable and dedicated Support Engineer to join a small IMS support team within MOAI NEO, focused on 5G Core and Cloud Core for NACI customers. In this pivotal role, you will own complex L2/L3 incidents, improve live network stability, and work closely with product, project and problem management teams to reduce outages, prevent repeat faults and introduce new CCxx releases safely. You will play a key role in delivering reliable, high-performing 5G Cloud Core solutions, ensuring customer satisfaction, operational excellence and ongoing service stability.
What you will do
- Lead investigations and drive the resolution of complex L2/L3 incidents across IMS, 5G Core and Cloud Core environments.
- Restore customer networks and services during critical incidents, taking ownership of fault isolation, advanced troubleshooting and service recovery.
- Analyse system behaviour, identify root causes and work with problem management to prevent repeat faults and improve live network stability.
- Collaborate with product, project and delivery teams to support safe introduction of new CCxx releases and operational changes.
- Communicate clearly with customers and internal stakeholders during high-pressure incidents, providing timely updates and practical technical guidance.
- Drive operational efficiencies through automation, knowledge sharing, mentoring and continuous improvement.
- Independently manage support cases, resolve critical issues without escalation where possible, and contribute to reduced turnaround times.
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## The Skills You Bring
Core IMS / VoLTE / VoWiFi domain
- Strong understanding of IMS architecture and call flows, including P/I/S-CSCF, BGCF, MGCF, SBC, TAS/MMTel, HSS/UDM, PCRF/PCF, AS and related network functions.
- Knowledge of VoLTE, VoWiFi and VoBB fundamentals, including registration, originating and terminating calls, supplementary services, SMS over IMS, emergency calls, interconnect and roaming scenarios.
- Familiarity with vendor-specific IMS implementations and common deployment topologies.
Protocols and networking
- SIP and SDP expertise, including method types, dialogs, routing, forking, error codes, re-INVITE and UPDATE.
- Diameter knowledge across Cx, Sh, Ro, Rx, Gy/Gx interfaces, with exposure to Radius where applicable.
- Solid IP networking capability, including IPv4/IPv6, routing, VLANs, DNS/ENUM, NAT, firewalls, load balancers and QoS.
- Understanding of TLS/IPSec, certificates and basic security concepts for signaling and media.
Platforms, OS and tooling
- Linux administration skills, including systemd, networking, storage and performance basics.
- Experience with virtualization and cloud/NFVI concepts, including VMs, OpenStack, VMware and increasingly containers/Kubernetes for cloud-native IMS.
- Proficiency with tracing and analysis tools such as tcpdump, Wireshark, vendor trace tools, log parsing, KPI/alarm monitoring, NMS/EMS, Grafana, Prometheus or equivalent platforms.
