Everything here is v0. Experimental code, technical deep-dives, and core logic.
Every public project on one desk. Break a seal and the live site opens right there.
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authz-playground
authz-playground PublicGive Cedar, OPA/Rego, Casbin and ReBAC the same authorization rules, then watch where their answers diverge. Runs entirely in the browser.
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cross-connect
cross-connect PublicAWS Direct Connect, drawn: an interactive, bilingual (EN/JA) explainer of connections, VIFs, DX gateway, BGP, resiliency, MACsec and pricing.
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Repositories
Showing 10 of 33 repositories
- shogi Public
Shogi played by whoever turns up. Every move is a GitHub issue and the board is the README.
- wtfe Public
How software engineers in different countries think and work — every claim sourced and rated for confidence. English / 日本語.
- vpn-is-the-door Public
Why VPN appliances are the main way ransomware gets into Japanese organizations (61 of 92 known entry routes in 2025, NPA): statistics, real cases, 31 exploited VPN flaws. EN / 日本語.
- on-ramp Public
Every way from a corporate network into AWS, drawn as a road map: VPN, Direct Connect, SD-WAN, Transit Gateway, Cloud WAN, PrivateLink, hybrid DNS, user access. EN/JA.
- s3-atlas Public
Everything about Amazon S3 — deep research docs, command cookbook, competitor and market analysis, and an interactive visual atlas (EN/JA).
- cross-connect Public
AWS Direct Connect, drawn: an interactive, bilingual (EN/JA) explainer of connections, VIFs, DX gateway, BGP, resiliency, MACsec and pricing.
- identity-deep-dive Public
Collect, score, and surface deep-dive candidates across OAuth WG, WIMSE, and OpenID Foundation specs
- caller-identity Public
Interactive, wire-level walkthrough of how AWS credentials are issued, signed, verified and authorized. Every SigV4 signature is computed in your browser.
- assume-role Public
AWS STS, drawn: every endpoint, every API, every way a workload or a human ends up holding temporary credentials. Interactive, bilingual (EN/JA).
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