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Hidenari Fujiwara

"No predictions. Data only." — Freelance web developer in Japan, writing about Claude Code, Python automation, and what actually survives a backtest.

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Your Browser Automation Clicks Might Be Landing 25% Off — And Nothing Will Tell You
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Your Browser Automation Clicks Might Be Landing 25% Off — And Nothing Will Tell You

#automation #webdev #javascript #debugging
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6 min read
Building an Incremental Financial Data Pipeline on a Free Tier (¥0 Infrastructure)
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Building an Incremental Financial Data Pipeline on a Free Tier (¥0 Infrastructure)

#python #datascience #architecture #tutorial
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5 min read
launchd: The macOS Scheduler You Already Have (A Practical Tutorial)
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launchd: The macOS Scheduler You Already Have (A Practical Tutorial)

#macos #automation #tutorial #productivity
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4 min read
Japan's Stock Exchange Has an Official API for Individuals. Almost Nobody Outside Japan Knows About It.
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Japan's Stock Exchange Has an Official API for Individuals. Almost Nobody Outside Japan Knows About It.

#python #api #datascience #finance
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4 min read
I Asked Claude Code to Find Me a Trading Edge. It Killed Three Strategies First.
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I Asked Claude Code to Find Me a Trading Edge. It Killed Three Strategies First.

#ai #python #automation #finance
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6 min read
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