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Mahiro Hirakawa

19, Tokyo. I build more than I can ship — and I'm honest about the graveyard behind me. Prolific, AI-native, JP-native, hype-allergic. Working the last mile in public.

Location Tokyo, Japan Joined Joined on  Personal website https://glovrex.com github website twitter website
ime bugs, display-width bugs, and bidi bugs are the same bug
mahirhir profile

ime bugs, display-width bugs, and bidi bugs are the same bug

#debugging #frontend #javascript #webdev
4
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4 min read

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Output is cheap now. Keep the receipts.
mahirhir profile

Output is cheap now. Keep the receipts.

#discuss #ai #productivity #career
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Comments 1
4 min read
Teaching a grader the difference between pаypаl and paypal
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Teaching a grader the difference between pаypаl and paypal

#unicode #i18n #opensource #machinelearning
5
Comments
4 min read
a width check said the string was safe to cut. it split a kanji in half.
mahirhir profile

a width check said the string was safe to cut. it split a kanji in half.

#javascript #unicode #i18n #webdev
5
Comments 1
7 min read
The Enter key that submits your form while a Japanese user is still typing
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The Enter key that submits your form while a Japanese user is still typing

#javascript #i18n #testing #webdev
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Comments 3
5 min read
Three ways CJK text breaks big open-source projects, over and over
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Three ways CJK text breaks big open-source projects, over and over

#i18n #opensource #javascript #webdev
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Comments 4
6 min read
The Sandwich Test: How I Check If A Dev-Tool Idea Is Actually Winnable Before I Build It
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The Sandwich Test: How I Check If A Dev-Tool Idea Is Actually Winnable Before I Build It

#devtools #startup #opensource #indiehackers
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Comments 2
5 min read
How this page breaks Japanese lines
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How this page breaks Japanese lines

#cjk #typography #javascript #webdev
4
Comments
2 min read
The Enter key that fires while you're still typing
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The Enter key that fires while you're still typing

#cjk #ime #javascript #webdev
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Comments 2
3 min read
I cataloged 93 CJK and Unicode bugs in open source. Most are the same five mistakes.
mahirhir profile

I cataloged 93 CJK and Unicode bugs in open source. Most are the same five mistakes.

#opensource #i18n #javascript #webdev
4
Comments
5 min read
A searchable corpus of CJK and Unicode bugs in open-source libraries
mahirhir profile

A searchable corpus of CJK and Unicode bugs in open-source libraries

#japan #i18n #webdev #unicode
5
Comments
4 min read
Your main input handles IME composition. The rename box next to it doesn't.
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Your main input handles IME composition. The rename box next to it doesn't.

#javascript #react #i18n #a11y
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Comments 2
4 min read
Japan-readiness is a cliff, not a gradient: what 92 dev tools' front doors actually look like
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Japan-readiness is a cliff, not a gradient: what 92 dev tools' front doors actually look like

#japan #localization #saas #devtools
1
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6 min read
I find Japan-shaped holes in global software
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I find Japan-shaped holes in global software

#javascript #i18n #react #webdev
1
Comments
4 min read
how to build a CJK/IME regression suite for a terminal or editor app
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how to build a CJK/IME regression suite for a terminal or editor app

#testing #i18n #ai #japanese
1
Comments
5 min read
I tested whether AI coding agents break on Japanese input
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I tested whether AI coding agents break on Japanese input

#ai #opensource #i18n #japanese
1
Comments
3 min read
the bugs that only break in Japanese (and how to find them in someone else's repo)
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the bugs that only break in Japanese (and how to find them in someone else's repo)

#opensource #i18n #japanese #webdev
1
Comments
3 min read
the bug a merged fix forgot: how i find first OSS contributions that actually merge
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the bug a merged fix forgot: how i find first OSS contributions that actually merge

#opensource #beginners #github #tutorial
1
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5 min read
I scanned 15 funded developer tools for Japan-readiness. Every one scored F.
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I scanned 15 funded developer tools for Japan-readiness. Every one scored F.

#japan #i18n #webdev
1
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2 min read
The Japan-readiness Standard
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The Japan-readiness Standard

#japan #i18n #webdev
1
Comments
3 min read
the same few bugs keep hiding in libraries you already trust
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the same few bugs keep hiding in libraries you already trust

#opensource #debugging #programming #webdev
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6 min read
"Personas vs. tool-scoping: where I landed differently from gstack"
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"Personas vs. tool-scoping: where I landed differently from gstack"

#claudecode #ai #agents #productivity
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3 min read
"Read-Only Reviewer Agents Catch What Your Main Agent Waves Through"
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"Read-Only Reviewer Agents Catch What Your Main Agent Waves Through"

#claudecode #ai #productivity #opensource
1
Comments
4 min read
"Your Repo Is the Memory. Your Model Is the Worker."
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"Your Repo Is the Memory. Your Model Is the Worker."

#claudecode #productivity #ai #webdev
1
Comments
4 min read
"I Found ~30 Mergeable OSS Bugs in a Day. They Were All the Same Shape."
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"I Found ~30 Mergeable OSS Bugs in a Day. They Were All the Same Shape."

#opensource #productivity #claudecode #webdev
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Comments
3 min read
Stop using the model as your memory
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Stop using the model as your memory

#ai #claudecode #agents #productivity
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Comments
3 min read
I built a Reddit reply-bot to find posts worth answering. Then I deleted the part that posts.
mahirhir profile

I built a Reddit reply-bot to find posts worth answering. Then I deleted the part that posts.

#opensource #indiehackers #ai #webdev
1
Comments
3 min read
Your AI-tool usage is invisible. Here are 4 tiny local tools to see it.
mahirhir profile

Your AI-tool usage is invisible. Here are 4 tiny local tools to see it.

#claude #ai #opensource #productivity
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Comments 2
5 min read
What I learned shipping 4 Japanese-i18n PRs into real OSS as a faceless 19yo
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What I learned shipping 4 Japanese-i18n PRs into real OSS as a faceless 19yo

#opensource #i18n #beginners #career
1
Comments
5 min read
I scored 40 dev tools on Japan-readiness. 0 of 40 have a Tokushoho (特商法) page.
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I scored 40 dev tools on Japan-readiness. 0 of 40 have a Tokushoho (特商法) page.

#japan #devtools #localization #i18n
1
Comments
2 min read
I built 128 things with AI. 127 are dead. So I started shipping into real OSS instead.
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I built 128 things with AI. 127 are dead. So I started shipping into real OSS instead.

#opensource #japan #buildinpublic #webdev
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Comments 1
2 min read
I built 128 things with AI in 4 months. Then I made an AI dissect all of it.
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I built 128 things with AI in 4 months. Then I made an AI dissect all of it.

#ai #buildinpublic #career #productivity
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Comments 20
3 min read
I built a 5-second CLI to check if your site is ready for the Japanese market
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I built a 5-second CLI to check if your site is ready for the Japanese market

#japan #cli #webdev #opensource
1
Comments
2 min read
The Enter key that quietly breaks Japanese input (and how to test if your app does it)
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The Enter key that quietly breaks Japanese input (and how to test if your app does it)

#japan #i18n #webdev #a11y
1
Comments
2 min read
Where foreign dev-tools quietly lose the Japanese market — and a free index to check your own
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Where foreign dev-tools quietly lose the Japanese market — and a free index to check your own

#i18n #opensource #saas #japan
1
Comments
4 min read
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