Resume
Resume
Section titled “Resume”2026-06-01 Current
Summary
Section titled “Summary”SRE with over 6 years of experience leading observability establishment for large-scale internal IaaS/PaaS.
Led the design, construction, and operation of scalable monitoring infrastructure for over 10,000 physical servers and 100,000+ VMs. Proven track record in improving service reliability from alert notification to automatic recovery.
Experienced in team management, recruitment, and leading cross-team technical standardization.
Key Skills
Section titled “Key Skills”- System Design: Rapidly delivers high-precision designs for performance, availability, observability, and cost grounded in analysis of system characteristics.
- Private Cloud & DevOps: Proficient at designing DevOps systems and using tools (Ansible, Terraform, Github Action). Expertise in networking and virtualization related to OpenStack.
- Technical Stack: Kubernetes, OpenTelemetry, Grafana Loki, Prometheus, Terraform, Go, Python.
- Leadership: Great leadership in system development and Incident Handling as TechLead. Experience in team management and recruitment.
- Communication: Excellent communication skills to clarify customer problems and propose solutions. English (Business), Japanese (Native).
- Achievements:
- StackStorm User Group Japan - Board Member
- Winner of RedHat’s Ansible Blog Contest
- Certifications:
- Network Specialist (2019)
- Applied Information Technology Engineer (2017)
Career History
Section titled “Career History”KAKEHASHI inc. (Tokyo, Japan)
Section titled “KAKEHASHI inc. (Tokyo, Japan)”Tech Lead, AuthN/Z Platform Apr 2026 ~ Present
Develop and operate a high-throughput AuthN/Z platform for medical-grade systems. Lead infrastructure design and IaC validation tooling; contribute to company-wide infrastructure and AI research initiatives.
- AuthN/Z Platform: Development and operation of a high-load authentication and authorization platform for medical-grade systems.
- Infrastructure: Infrastructure design for the platform and its dependencies.
- IaC: Led development of validation tooling for infrastructure-as-code.
- Research: Member of company-wide task forces on infrastructure and AI.
LINE Yahoo Corporation (Tokyo, Japan)
Section titled “LINE Yahoo Corporation (Tokyo, Japan)”Senior Engineer, IaaS Dev Department Oct 2023 ~ Apr 2026
Lead the monitoring design for a new internal cloud platform. Directed technical selection, architecture design, and implementation for the company’s first joint product following the merger.
- Platform Design: Led the formulation of standard configurations for the company-wide monitoring platform after the merger.
- Scalability: Designed, implemented, and operated a physical server metrics/log storage and high-speed query platform handling 100,000-scale servers.
- Automation: Designed, implemented, and operated a physical server recovery automation system (Kubernetes operator).
- Observability: Designed and implemented long-term SLI calculation procedures. Executed the introduction of new monitoring components to the existing cloud platform.
- Process: Led the standardization of monitoring platform usage processes and internal coordination.
- Tech Stack: Kubernetes, OpenTelemetry, Grafana Loki, Prometheus, Terraform, Go, Python.
LINE Corporation (Tokyo, Japan)
Section titled “LINE Corporation (Tokyo, Japan)”Reliability Engineer (Manager / Engineer) Jun 2019 ~ Sep 2023
Led improvements and new development of IaaS monitoring and deployment systems for the Verda Reliability Engineering Team.
- Management (July 2021 ~):
- Led the identification and resolution of cross-team issues, including system design for storing/querying metrics/logs at a TB/day scale.
- Standardized documentation policies and templates.
- Managed recruitment strategies, designing technical/behavioral interviews.
- Proactive public speaking and support for team members to speak at conferences.
- Led data center-level compute resource migration.
- Engineering:
- Improved scalability and high availability of metrics monitoring infrastructure for tens of thousands of physical servers.
- Reduced physical server deployment time from 9 hours to 1 hour.
- Built an automatic API metrics collection system by introducing Kubernetes sidecar API gateway.
- Designed and implemented SLO definitions and SLI measurement systems, including for OpenStack Nova.
- Conducted solution architect activities for users and provided incident handling direction.
- Tech Stack: Kubernetes, Prometheus, Grafana, Terraform, Go, Python.
NTT Technocross Corporation (Tokyo, Japan)
Section titled “NTT Technocross Corporation (Tokyo, Japan)”Engineer, Cloud & Security Division Apr 2016 ~ May 2019
- Responsible for maintenance/operation of NTT Group’s OpenStack-based cloud services and design/development of a new internal cloud platform.
- Led network and deployment methods for cloud platform design.
- Conducted R&D with NTT Laboratories on construction interface abstraction and code-based construction procedures for numerous network devices.
- Developed and supported CI/CD systems for OpenStack-based cloud and low-layer infrastructure.
- Lectured and wrote technical content related to DevOps as the youngest instructor in the company.
- Tech Stack: OpenStack, Ansible.