Appealing Points
- Lead complex security engineering initiatives, from design and implementation to operational optimization, in one of the world's most advanced telecom environments.
- Drive zero-trust architecture, micro-segmentation and secure operational automation, strengthening network perimeters, defensive infrastructure and cloud-native platforms.
- Work with global teams across Japan and overseas, on a stack spanning Kubernetes, F5, Cisco security products and cloud security services.
Annual Salary: ¥8 million and above
Job Description
The Security Engineering & Operations Division is responsible for the design, operation and continuous improvement of security across the network, cloud and platform environments of a mobile service. The Security Engineering Department strengthens controls for network perimeters, defensive infrastructure and cloud-native platforms to provide a resilient and trusted telecommunications foundation. Within this department, the System Security Engineering Section drives zero-trust architecture, micro-segmentation and secure operational automation.
Job Responsibilities
- 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 mentor junior engineers.
- Cross-Functional Collaboration: Partner with network, platform, development, SOC and GRC stakeholders to drive integrated security improvements.
Required Qualifications
- 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.
Preferred Qualifications
- 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.
Language Requirements: Advanced Business level English
About Company:
The largest eCommerce company in Japan, and the third-largest eCommerce marketplace company worldwide. The organization provides a variety of consumer and business-focused services including e-commerce, e-reading, travel, banking, securities, credit card, e-money, portal and media, online marketing, and professional sports. The company is expanding globally and currently has operations throughout Asia, Western Europe, and the Americas.
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