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Japan · since 2018

Toru Hosoi

細井 透 — Cloud Infrastructure Engineer

On-prem → telecom base-station operations → AWS — that's roughly the path of my eight years in infrastructure. These days I run the AWS platform behind a Japanese video streaming service, where millions of users arrive within minutes of a prime-time show ending.

I cover the infrastructure end to end — design, build, operations, incident response, spike planning, and team lead.

Name
Toru Hosoi / 細井 透
Role
Infra Engineer / PL
Experience
8 years on AWS
Location
Japan
01

About.

I design and operate AWS platforms built around ECS Fargate, Aurora, and CloudFront — services with millions of users, end to end.

02

Work.

2018 — now Video streaming platform Project lead for infrastructure. Large-scale platform built on CloudFront, ECS Fargate, and Aurora.
2023 Public infrastructure entity Built the infrastructure for a payment site. Designed DirectConnect, ECS, and RDS with Terraform.
2013 — 2017 Telecom carrier Base-station operations, Wi-Fi quality management, field testing.
2008 — 2013 Telecom equipment / SI Wireless equipment operations, rollouts for public-sector systems.

See the full résumé →

03

Stack.

A Cloud / AWS
01
ECS Fargate
Containers
02
Lambda
Serverless
03
Aurora
MySQL / PG
04
DynamoDB
KVS
05
ElastiCache
Redis
06
S3
Storage
07
CloudFront
CDN
08
ALB / NLB
Load balancer
09
WAF
Security
10
Route 53
DNS
11
OpenSearch
Search / logs
12
DirectConnect
Private network
B IaC / CI / CD
13
Terraform
Primary IaC
14
CodePipeline
CI/CD
15
GitHub Actions
CI/CD / OIDC
16
Docker
Containers
C Monitoring / Ops
17
CloudWatch
Metrics / logs
18
EventBridge
Events
19
PagerDuty
On-call
20
Datadog
APM
D OS / Lang / Tools
21
Linux
RHEL / Amazon Linux
22
Shell Script
Ops scripts
23
GitHub
Source control
24
Cursor / Claude
AI-assisted dev
04

Certifications.

  • ITIL Foundation Version 42025.07
  • AWS Certified SysOps Administrator — Associate2023.12
  • AWS Certified Solutions Architect — Associate2022.09
05

Writing.

01

Designing for traffic spikes in video streaming

AWS
02

How this site is built

Infra
03

Portfolio

Career
04

About Toru Hosoi

Profile
06

Contact.

Open to work, speaking, and writing inquiries. GitHub is the easiest way to reach me.