About.

I specialise in designing, building, and operating infrastructure on AWS. I've been the project lead for the platform behind a major Japanese video streaming service for about eight years.

The stack centres on ECS Fargate, Aurora, and CloudFront, serving a service with millions of users. Everything is managed in Terraform, with a strict no-manual-changes policy.

Name

Toru Hosoi

Japanese

細井 透（ほそい とおる）

Focus

AWS cloud infrastructure, video streaming platforms, IaC

Based in

Tokyo, Japan

GitHub

@thorhosoi

Traffic spikes are frequent in video streaming. I cover the full cycle — pre-scaling, cache strategy, day-to-day operations.

• AWS — end-to-end design, build, and operations
• Terraform — infrastructure as code
• ECS Fargate — container platform design and operations
• Aurora — MySQL / PostgreSQL
• CloudFront — CDN delivery
• CodePipeline — CI/CD pipeline design
• DirectConnect — private network connectivity
• CloudWatch / PagerDuty — monitoring and alerting

I started out in telecom — maintaining mobile base stations and managing wireless quality for a major Japanese carrier. From there I moved into AWS cloud infrastructure. Since 2018 I've worked primarily on a broadcaster-owned video streaming platform, with side projects including real-time streaming for a fitness chain, a medical/recruiting web media site, and public-sector systems. In 2023 I also led the infrastructure build for a payment site at a public infrastructure entity.

See the portfolio for details.

• ITIL® Foundation Version 4 (July 2025)
• AWS Certified SysOps Administrator — Associate (December 2023)
• AWS Certified Solutions Architect — Associate (September 2022, expired)

• Portfolio
• GitHub — @thorhosoi