Jake Castillo(@jakecastilloooo):A tweet is 280 characters. The Cal AI story is closer to 5,000 words per chapter. I've spent 6 weeks turning what we built into single-paragraph posts. There's another 50,000 words I haven't gotten to yet. Launching a weekly newsletter for the long version: The Operator's Notebook. Free. 5-minute read. Subscribe here:

Jake Castillo

@jakecastilloooo

Co-founder & COO of Cal Al (acquired by MyFitnessPal) - Sub to my free newsletter

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Jake Castillo@jakecastilloooo

2026.05.19 17:32

A tweet is 280 characters. The Cal AI story is closer to 5,000 words per chapter. I've spent 6 weeks turning what we built into single-paragraph posts. There's another 50,000 words I haven't gotten to yet. Launching a weekly newsletter for the long version: The Operator's Notebook. Free. 5-minute read. Subscribe here:

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