L3 Support Engineer

Job Description

Appealing Points:

• Opportunity to lead advanced incident resolution and root cause analysis for large-scale 5G Core networks, playing a critical role in next-generation telecom operations
• Hands-on exposure to cloud-native telecom platforms using Kubernetes, enabling deep expertise in modern Telco Cloud infrastructure and operational optimization
• High-impact technical leadership role involving global vendor collaboration, knowledge transfer, and team mentoring, strengthening both technical and people leadership capabilities

Annual salary : 8 Million yen and above

Job Responsibilities:

• Incident Resolution & RCA: Provide advanced technical analysis for complex incidents within the 5GC network and lead root cause identification.
• Deliverables: Incident analysis reports, Root Cause Analysis (RCA) reports.
• Vendor Technical Liaison: Collaborate with network equipment vendors to discuss technical issues, validate bug fixes, and ensure the implementation of permanent solutions.
• Deliverables: Technical inquiry records, patch validation reports.
• Cloud-Native Infrastructure Operations: Perform advanced operations, maintenance, and troubleshooting for container-based network platforms using Kubernetes.
• Deliverables: Platform health reports, operational improvement proposals.
• Knowledge Transfer (KT) & OJT: Conduct On-the-Job Training (OJT) for L1/L2 engineers through real-world incident handling and operational tasks to enhance their technical capabilities.
• Deliverables: OJT records, training materials, technical knowledge base (KB) documentation, Q&A repositories.
• Operational Optimization & Automation Support: Propose improvements for operational procedures and monitoring processes based on troubleshooting insights, and provide technical assistance for operational automation.
• Deliverables: Updated operational procedures, KB documentation, technical proposals/implementation support for automation tools and scripts.

Job Qualifications:

• 10+ years experiences in telecom industries including 5+ years NOC operations or 2+ years NOC management
• Technical Expertise:
  • Deep knowledge of 5G Core (AMF, SMF, UPF, PCF, UDM, etc.) design and operations.
  • Proven experience in operating and troubleshooting container platform environments using Kubernetes.
  • Experience in operations and maintenance of container-based network platforms in large-scale telecommunications environments.
  • Strong protocol-level analysis skills using packet analysis tools (e.g., Wireshark, Tcpdump).
• Experience:
  • Proven track record as an L3 Support Engineer or Subject Matter Expert (SME) in large-scale telecommunications networks.
  • Demonstrated experience in technical mentoring and training (e.g., OJT, knowledge transfer).
• Language & Soft Skills:
  • Fluent in English, capable of conducting technical negotiations with global vendors.
  • Professional mindset with the ability to remain calm, autonomous, and decisive during high-pressure incident response situations.

Preferred Qualifications:

• Experience in implementing operational automation using CI/CD pipelines (e.g., Jenkins, GitLab).
• Experience in developing analysis tools using scripting languages such as Python or Go.
• Experience in performance optimization and tuning for large-scale traffic environments.

Company Description:

We are a strategic digital transformation company helping businesses evolve through cloud-native technologies.

As a leading AWS Advanced Consulting Partner with 18 years of deep expertise, commitment to digital innovation, service excellence, and customer success, we understand what it takes to make our clients’ cloud migration and modernization business goals a reality with the most advanced technologies and services the cloud has to offer.

Working strategically, we enable enterprises to unlock new business capabilities, rapidly scale, and accelerate growth on the cloud. To further eliminate the repetitive, time-consuming, and labor-intensive work for every cloud-native solution, we leverage our accelerator, ARC - a true differentiator in the industry.