Owndays

Senior Infrastructure Engineer

Location

Tokyo

Remote

On-site / hybrid

Visa

Sponsorship available

Language

Japanese: Business Level / English: Business Level

Posted

Jan 21, 2026

AWS

Infra

Engineering

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Overview

Job Title: Senior Infrastructure Engineer (AWS)

Job Summary

We are seeking a highly experienced Senior Infrastructure Engineer to design, build, and operate scalable, secure, and highly available infrastructure primarily on AWS. The ideal candidate has deep hands-on experience in cloud infrastructure, automation, and reliability engineering, and plays a key role in driving best practices across the organization.

Responsibilities

Design, implement, and maintain cloud infrastructure on AWS with a focus on scalability, security, and reliability.
Lead infrastructure architecture decisions and contribute to long-term technical strategy.
Build and manage Infrastructure as Code (IaC) using tools such as Terraform, CloudFormation, or similar.
Automate infrastructure provisioning, deployment, and operational tasks.
Ensure high availability, disaster recovery, and backup strategies are in place and tested.
Monitor system performance, availability, and costs; optimize for reliability and efficiency.
Collaborate closely with application, security, and DevOps teams to streamline delivery.
Troubleshoot complex infrastructure issues and lead incident response when required.
Enforce security best practices, including IAM, network security, and compliance standards.
Mentor junior engineers and review infrastructure designs and code.

Required Skills

5+ years of experience in infrastructure, cloud, or platform engineering.
Strong hands-on experience with AWS (e.g., EC2, VPC, IAM, RDS, S3, EKS/ECS, CloudWatch).
Proven experience with Infrastructure as Code (Terraform, CloudFormation, etc.).
Solid understanding of networking concepts (VPCs, subnets, routing, load balancers, DNS).
Experience with Linux-based systems and system administration.
Experience building and operating production-grade, highly available systems.
Strong troubleshooting and problem-solving skills.
Ability to work independently and take ownership of complex systems.

Preferred Skills

Experience with containerization and orchestration (Docker, Kubernetes, EKS).
CI/CD pipeline experience (GitHub Actions, GitLab CI, Jenkins, etc.).
Experience with monitoring and observability tools (Prometheus, Grafana, Datadog, etc.).
Knowledge of security best practices and compliance frameworks.
AWS certifications (e.g., Solutions Architect, DevOps Engineer).
Experience working in high-scale or mission-critical environments.