Founder, BULL LLC | Creator of TenkaCloud

冨田進 / Susumu Tomita

Building hands-on cloud engineering systems. Founder of BULL LLC and creator of TenkaCloud, the open-source platform for running real AWS competitions.

TenkaCloud is an open-source, multi-tenant platform for running GameDay-style cloud competitions and hands-on training on real AWS accounts.Cloud Infrastructure, IaC, DevOps, Security, and Hands-on Engineering Education.

See TenkaCloud Contact GitHub

What I Build

TenkaCloud

Realistic cloud training breaks down when every event needs weeks of setup. TenkaCloud turns GameDay-style competitions into a repeatable platform: a multi-tenant control plane deploys challenge environments straight into participants' AWS accounts, so people learn on real infrastructure — not on slides or simulators.

Formats & platform

• Battle — real-time competitions between teams
• Challenge — self-paced problem solving on real AWS
• Operations console for organizers: tenants, roles, SSO, auditability
• Automated deploys into participants' own AWS accounts

Who it's for

• CCoE — Cloud Centers of Excellence running internal enablement
• SRE / Platform teams — Teams practicing incident response and operations
• Training managers — Technical training with real AWS accounts, not slides
• Universities & communities — Hands-on events without heavy per-event setup

The platform is open source. BULL LLC provides commercial support around it — hosting competitions, building custom problems, and adopting it in-house.

tenkacloud.com Source on GitHub Details & inquiries

Speaking & Writing

Talks & writing

Slides on Speaker Deck Speaker profile on Sessionize Articles on Zenn

Speaking requests are welcome —get in touch.

Experience

Where I've worked

Hitachi, Ltd. — QA engineer / technical lead (2006–2017)
Hitachi Vantara (US) — Software QA specialist (2017–2018)
DENSO — Software architect / cloud lead (2018–2025), agile coach (2026–)
WHILL — Cloud application development (2021–2022)
Logomix — Lab automation / SRE (2025–2026)
MynaWallet — Web3 infrastructure and security (2025–)

Full background →

2 books · 3 editions

Published Technical Books

Hands-on books built from working repositories, reproducible steps, and the same review discipline used for software.

How I write them →

Zig · Blockchain · EVM

Zig言語で学ぶブロックチェイン

Build a blockchain, P2P networking, chain synchronization, and a minimal EVM from scratch in Zig.

日本語版を読むZenn

AWS · GameDay · TenkaCloud

Build Your Own Cloud Competition

Design, build, and run GameDay-inspired AWS Challenges and Battles with TenkaCloud. Published in Japanese and English.

日本語版Zenn EnglishLeanpub

Get in touch

For TenkaCloud, cloud infrastructure and DevOps work, or speaking and writing requests.

General inquiries:inquiry form

冨田進 / Susumu Tomita