#startup-founder

#startup-founder

I became interested in consulting through some older friends while studying at the University of São Paulo in Brazil. Their stories about how fast you could learn and grow in the career made me want to pursue it. I applied to all the top firms and accepted McKinsey's offer to be a business analyst in 2010 as soon as I received it. It was the best thing I could imagine as a long-term career.

Whenever an idea pops into Oscar Rachmansky's head, he whips out a notebook or whatever scrap of paper is closest and writes it down. It's a habit you might expect from a Gen Xer or elder millennial clinging to analog comfort. Rachmansky is neither. He's 24, and the company he founded about five years ago generated $40 million in sales revenue in 2025 (confirmed from documents reviewed by Business Insider).

Running the company is no easy feat: Marchione works seven days a week, putting in more than 12 hours a day. That means his self-care routine is precisely dialed in. Marchione says he has always taken an unconventional, even contrarian approach, exploring beyond what mainstream medicine recommends. As a teen, he was an early adopter of fitness wearables like the Oura ring, and got into blue-light-blocking glasses and mouth taping - trends that, despite some mixed evidence, have become incredibly popular in wellness today.