Senior Network Security Engineer

必須

• 8+ years of hands-on experience as a Network or Security Engineer.
• Proven experience designing and operating network, cluster, and container security for Kubernetes environments.
• Extensive experience building and troubleshooting F5 products (LTM, ASM/AWAF).
• Practical experience with Cisco security products (ASA, Firepower, ISE, Umbrella).
• Working knowledge of cloud-native security, including IAM, networking, and vulnerability management.
• Demonstrated technical leadership in incident response and risk reduction initiatives.
• Professional proficiency in English (technical communication, documentation, and stakeholder coordination).
• English (Overall - 3 - Advanced)

歓迎

• Professional certifications: CISSP, CCNP/CCIE Security, CKS, or Cloud Security (AWS/Azure/GCP).
• Experience automating security operations using Terraform, Ansible, or Python.
• Deep knowledge of Zero Trust, Microsegmentation, SASE/SSE, SIEM, or SOAR.
• Experience in large-scale, high-availability environments (Telecommunications, Finance, or E-commerce).
• Proven track record in team leadership, mentoring, and technical standardization.

使用ツール

Job Duties:

• Kubernetes Security:** Design, implement, and improve network and cluster security for Kubernetes-based environments.
• Traffic & Application Security:** Design and operate load balancing, WAF, SSL/TLS, and traffic control solutions using F5 technologies (LTM, ASM/AWAF).
• Perimeter & Access Security:** Design, configure, and troubleshoot Cisco security products, including ASA, Firepower, ISE, and Umbrella.
• Cloud Security Architecture:** Establish security baselines for cloud environments, focusing on IAM, network isolation, logging, monitoring, and vulnerability management.
• Incident & Vulnerability Management:** Investigate security incidents and audit findings, driving permanent remediation and preventive measures.
• Operational Excellence:** Improve operational automation, define configuration standards, create technical documentation, and provide mentorship to junior engineers.
• Cross-Functional Collaboration:** Partner with network, platform, development, SOC, and GRC stakeholders to drive integrated security improvements.

Work Environment:

• Department:** System Security Engineering Section, Security Engineering Department.
• Collaboration:** Work with global teams across Japan and overseas.
• Tech Stack:** Kubernetes, F5 LTM/ASM/AWAF, Cisco ASA/Firepower/ISE/Umbrella, Cloud Security Services, Linux, CI/CD, and monitoring/logging platforms.