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I built an AI app with a tiny team. We scaled it to millions and sold it to MyFitnessPal in under 2 years — here’s how.

Finance April 20, 2026

This as-told-to essay is based on a conversation with Jake Castillo, the 31-year-old CMO and cofounder of Cal AI, based in Los Angeles. Cal AI is an AI-native app co-founded by a tiny team of Castillo and three others. The lean team quickly scaled to millions in monthly revenue, leading…

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I built an AI app with a tiny team. We scaled it to millions and sold it to MyFitnessPal in under 2 years — here’s how.

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