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Diary of a Solo Entrepreneur

Ramon Rubio de Castro

Personal notes on building a business while holding down a corporate job and father of 3 kids.

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Substack
PricingOnly free issuesPublishesWeekly
Issues80Founded2 years agoLast Issue9 days ago
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Latest Issues

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Yesterday I watched an interview with the CEO of Airbnb that stuck with me.

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9 days ago

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We like to believe that life happens to us, but far more of it is in our hands than it looks.

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As usual, time is our most valuable currency. I don’t want to waste yours — so let me front-load the value.

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a month ago

I Have 377,000 Hours Before I Die

I’m 37. Father of three — 7, 5, and 1.

I have a corporate job, 9 to 5, that pays the bills and teaches me things.

I play tennis and football when my knees allow it.

I like laughing with friends more than I like being right about anyth...

a month ago
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I Don't Want My Side Business to Make Money Yet

’s latest newsletter landed in my inbox last week: The One-Human Business: How To Earn In The Age of AI.

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  • Ramon Rubio de Castro

    37, father of 3, employed from 9 to 5, and building my own thing since 2023. This is where the knowledge gets shared.

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