Appealing Points
- Work on mission-critical infrastructure that supports a rapidly growing mobile service, with a direct impact on stable operations and security quality.
- Use an advanced technology stack including RHEL, Kubernetes, IPA/FreeIPA, Vault, Ansible, Git and CI/CD across on-premises and cloud environments.
- Collaborate with global teams with diverse backgrounds in Linux, networking, security, cloud and Kubernetes.
Annual Salary: ¥8 million and above
Job Description
The Security Engineering & Operations Department provides security infrastructure, network security, identity/access management and security operations platforms for a mobile service and its related services. As the business scales, secure and reliable operations across on-premises, cloud and Kubernetes environments are mission-critical.
To support rapid growth, the team is continuously expanding its Linux/Kubernetes-based platforms and strengthening its authentication and secrets management capabilities. It is seeking an experienced engineer with 8+ years of hands-on expertise to accelerate stable operations, drive standardization and raise the security quality of this infrastructure. The Network Security Engineering Section designs and operates secure network services using Linux, RHEL, Kubernetes, IPA/FreeIPA and Vault.
Job Responsibilities
- Linux Infrastructure: Design, build, operate and troubleshoot Red Hat Enterprise Linux and diverse Linux environments.
- Kubernetes Security: Securely operate, configure and optimize Kubernetes clusters and related components to meet growing operational demands.
- Identity & Access Management: Manage authentication, user lifecycle, authorization and policies using IPA/FreeIPA.
- Secrets & Certificate Management: Design and operate secrets management, PKI/certificate management and access control using HashiCorp Vault or equivalent tools.
- Security Hardening: Perform security hardening, patch management and audit support for Linux/Kubernetes environments to ensure high security standards.
- Automation: Drive configuration management, automation and standardization using tools such as Ansible to improve operational efficiency.
- Incident Management: Handle incidents, conduct root-cause analysis (RCA) and implement preventive measures for mission-critical services.
- Cross-functional Collaboration: Work closely with network, cloud, security and operations teams for technical communication and project coordination in a global environment.
Required Qualifications
- 8+ years of hands-on experience designing, building and operating Linux/RHEL environments.
- Proven experience operating, configuring and troubleshooting Kubernetes environments.
- Practical experience with authentication platforms (IPA/FreeIPA), including user and authorization management.
- Practical experience with secrets management, certificate management and access control (Vault or equivalent).
- Strong background in Linux security hardening, patch management and vulnerability remediation.
- Fundamental knowledge of networking, DNS, TLS/PKI, firewalls and load balancers.
- Strong analytical skills to independently handle incidents, analyze root causes and improve operational processes.
Preferred Qualifications
- Experience operating large-scale telecommunications, cloud or mission-critical infrastructure.
- Automation experience using Ansible, Terraform, Python or Shell scripting.
- Deep knowledge of Kubernetes security (RBAC, NetworkPolicy, container image management).
- Experience with monitoring, log analysis, SIEM integration and incident response workflows.
- Relevant certifications such as RHCE, CKA, CKS or other security-related credentials.
- Experience driving projects within global teams and managing multiple stakeholders.
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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