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Notes on product engineering, fintech systems, learning, and the decisions behind the work.

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Aug 29, 2026Ai Engineering

Stopped Re-Explaining Myself to Every AI — Shared Memory for ChatGPT, Claude, and Codex (Part 1)

Every new chat started the same way: I would explain my job, my goals, what had been bothering me lately, and everything I had already tried. I built Personal M

aipersonal-toolsmcplong-term-memory

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Jul 21, 2026Ai Engineering

Adding a Japanese Voice Chat AI to My Portfolio with VOICEVOX × Next.js

I added a voice chat feature to my portfolio site (meetyudai.com): you talk into the microphone, and it answers back in a natural Japanese voice. The speech syn

voicevoxttsnextjscloud-run

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Jul 21, 2026Ai Engineering

I Built a Personal Learning Pipeline Where AI Writes Me a Study Article Every Day

I'm a Japanese software engineer working in the Bay Area. After several years in payments at PayPal, I moved to Atlas, a fintech startup, where I still spend my

aiopenaiautomationfirebase

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Jul 21, 2026Ai Engineering

I Built My Own NotebookLM-Style Article-to-Podcast Pipeline

The first time I heard a NotebookLM audio overview — two AI hosts having a genuinely listenable conversation about a document I'd uploaded — my reaction wasn't

aittsopenaiautomation

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