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03 / WORK

Selected work,
anonymized.

Most engagements are under NDA. Here's a representative sample with client details removed.

Featured engagements

3 OF 9
acme-corp.com
ACME
ProductsAboutContactJP
Tools that ship with you, not against you.
Industrial-grade machinery for teams that move fast.
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© 2026 AcmeEN · 日本語
WEB MODERNIZATION

Rebuilt a 90-page corporate site as a static React stack

From WordPress + jQuery to Next.js. Lighthouse 100/100, content edited via Markdown, EN/JP locale at the routing layer.

Client
B2B SaaS · Tokyo
Duration
8 weeks
Largest Contentful Paint
−68%
support.acme.com/ai
AI Console
Inbox
Threads
Knowledge
Evals
Settings
Thread #4821 · ja-JPRESOLVED
Customer · 14:22
注文した商品が届かないのですが…
AI · suggestionconf 0.94
注文番号をお伺いできますか?追跡情報を確認します。
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EDIT
EVALSfaithfulness 0.91grounded 0.88tone 0.76
AI INTEGRATION

Production RAG console for a multilingual support team

Retrieval that retrieves the right thing across EN/JP/ZH content. Eval suite catches regressions before they ship.

Client
Customer Support · Tokyo
Duration
6 weeks
Time to resolve
−42%
kakero.jp/reports/acme-fintech
PRE-LAUNCH AUDIT · v1.22026-04-22
Acme Fintech · Threat Model + Findings
2
CRITICAL
5
HIGH
11
MEDIUM
8
LOW
CRITAuth bypass via stale JWT signing keyauth/session
CRITUser PII in client-side error logslogging
HIGHMissing rate-limit on password resetauth/reset
HIGHS3 bucket — anonymous listinfra/s3
SECURITY

Threat-modeled an early-stage fintech before launch

Identified two critical pre-prod issues, hardened the auth flow, and shipped a prioritized remediation plan their team owns.

Client
Fintech · Series A
Duration
4 weeks
Critical findings
2

More engagements

AI INTEGRATION

Eval-driven prompt refactor for a content moderation pipeline

Replaced ad-hoc prompt tweaks with a versioned eval suite. Cut false positives by 31%.

−31% FP
SECURITY

Incident response playbook + tabletop for a 40-person SaaS

Two days of tabletop exercises and a written runbook their CTO can hand to oncall.

1 playbook
WEB MODERNIZATION

Migrated an internal admin tool from Rails+Backbone to Remix

Page loads from 3.2s to 480ms. Zero feature regressions, full bilingual support added.

−85% TTFB
AI INTEGRATION

Hardened a customer-facing chatbot against prompt injection

Red-teamed against known attack classes; added structured input/output guards.

0 leaks
WEB MODERNIZATION

Multi-tenant marketing site overhaul for a JP retail chain

32 store sub-sites unified into one Next.js app with per-store theming and CMS.

32 → 1
SECURITY

Dependency hygiene + SBOM for a regulated infra team

Automated dep-scanning, signed SBOMs in CI, and a triage workflow that doesn't drown the team.

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