JA · 日本語
Fractional / contract

Design-minded full-stack engineer. 25 years shipping. Professional-illustrator background. I build entire products — measured, not claimed.

Tokyo-based (JST). I take design and code all the way through, alone or alongside your team.

Email me → I reply within one business day (JST).
森 秀之 / Hideyuki Mori
measured, not claimed — every figure links to proof as of 2026-07-16
5,000+
Merged PRs (own fleet)
github ↗
32
Public repos
gh repo list ↗
1,256 + 220
PHPUnit + Playwright E2E
tests/ ↗
121
MCP tools (fleet)
tools.json ↗
L8
PHPStan level 8
phpstan.neon ↗
01 · products

Working software first.

NeNe Suite is a set of production business apps — invoicing, cash reconciliation, document vault, sales pipeline — that I designed, built, and run solo. The screenshots below are the real UI. Rather than read about it, open the throwaway demo: no signup, and every click spins up a fresh, isolated environment you can safely break.

NeNe Invoice dashboard: billing and payment status
NeNe Invoice
Invoicing & quotes
NeNe Clear dashboard: payment reconciliation and receivables
NeNe Clear
Cash reconciliation / AR
NeNe Vault: received-document register and audit log
NeNe Vault
Document vault / audit
NeNe Deal: sales pipeline with deal stages
NeNe Deal
Sales pipeline
Try the throwaway Invoice demo → No signup · a fresh environment spins up on every click.
OSS / packages npm @hideyukimori/nene2-tokens Composer NENE2 PyPI nene2-python GitHub ↗
02 · services

Three ways to work together.

01
Fractional engineering

Tech lead and hands-on delivery, two to five days a week. I raise the bar of an existing team and steer legacy through change.

02
Contract development

A whole product, end to end — design, build, handover. Fixed total for well-defined business systems and SaaS.

03
Advisory & design review

Architecture and technology-choice review — fixed fee, 2 weeks, written report.

Engagements start at ¥500,000 (≈$3,400).

Rates on request — email me.

03 · selected writing

Selected writing

On architecture, testing, and MCP/API boundaries — written from real work. The thinking behind the code, in the open.

dev.toAn MCP tool wired to your production database — the app boundary I use instead↗ dev.toNENE2: a tiny PHP framework where AI agents call your API, not your database↗ dev.toBuilding a typed CMS for business data with PHP, OpenAPI, and MCP↗ dev.toClick a link, get a throwaway tenant: a zero-signup demo for a self-hosted app↗
All posts on dev.to ↗
04 · background in fine art

Background in fine art

I trained as a painter. That's the eye behind every interface I ship.

Hideyuki Mori illustration 01 Hideyuki Mori illustration 02 Hideyuki Mori illustration 03 Hideyuki Mori illustration 04 Hideyuki Mori illustration 05 Hideyuki Mori illustration 06 Hideyuki Mori illustration 07 Hideyuki Mori illustration 08 Hideyuki Mori illustration 09 Hideyuki Mori illustration 10
career & credits

Selected credits

OriginMusashino Art University (Japanese painting) · studied under the Kyoto Shijō school · first exhibition at Nihonbashi Mitsukoshi (2003) · street-fashion illustration since 2006 · ran the gallery “12G.” in Roppongi
TalksLive-paint & talk at Apple Store Ginza (2011) · guest lecture at Tokyo Communication Art College (2011)
FeaturedAdobe Japan official site (2012) · Monthly MdN Vol.213 and “Digital Illustration Making Book” (2012)
Selected workCharacter illustration for Arimasa Osawa’s “Quartet” (Kadokawa) — adapted for TV · Kadokawa Horror Bunko cover (2009)
AwardsMy Site Design Award 2011 Grand Prize, and more

Features, talks and awards are stated as fact.

05 · contact

Let's talk.

Rates on request — email me. Second opinions and early-stage ideas are welcome too.

Email me → I reply within one business day (JST).

Written-first: English works great over email, issues, and PRs. Live calls are held in Japanese.