1. Position Overview

• Role: 5GC L3 Support Engineer
• Department: Core Network Operations (PACO – L3)
• Work Location: Tokyo, Japan
• Working Model: 24x7 Operations (3-shift rotation)

2. Role Objective

• Ensure high availability, reliability, and performance of the 5G Core network by providing advanced L3 technical support, leading complex incident resolution, performing root cause analysis (RCA), and enabling operational optimization through automation and knowledge transfer.

3. Key Responsibilities

• Incident Management & RCA: Lead troubleshooting of critical and complex 5GC incidents and perform root cause analysis.
• Vendor Coordination: Act as primary interface with OEM/vendors for issue resolution and patch validation.
• 5G Core & Cloud-Native Operations: Operate and troubleshoot 5GC network functions (AMF, SMF, UPF, PCF, UDM) and Kubernetes platforms.
• Knowledge Transfer & OJT: Provide training and maintain KB documentation.
• Operational Improvement & Automation: Drive improvements and support automation initiatives.

4. Required Skills & Experience

• 10+ years in telecom domain.
• 5+ years in NOC / Operations Support or 2+ years in NOC management.
• Strong expertise in 5G Core architecture.
• Hands-on with Kubernetes and containerized platforms.
• Strong troubleshooting using Wireshark, Tcpdump.
• Fluent English and vendor coordination experience.

5. Preferred Skills

• CI/CD tools (Jenkins, GitLab).
• Scripting (Python / Go).
• Performance tuning and automation exposure.

6. Service & Operational Details

• 24x7 shift model (3 shifts).
• Ticket volume ~10/month.
• SLO: P1/P2: 1 hr, P3: 24 hrs, P4: 3 days.
• Tools: Kubernetes, OpenStack, Symworld, Radcom.

7. Governance & Reporting

• Weekly technical updates and monthly governance.
• Coordination with RM technical lead and L1/L2 teams.

8. Key Success Metrics

• MTTR compliance.
• RCA quality.
• Reduction in repeat incidents.
• Operational efficiency and automation gains.