How Mercado Libre built Latin America's most valuable company: 18k engineers, 30k deploys a day, and their own fleet of planes | Sebastian Barrios

Sebastian Barrios’s early App Store story shows a young developer learning through direct contact with platform rules. At 16 or 17, he built an app that deliberately drained a phone battery, both to experiment with its sensors and to help users who believed a full discharge was useful. Steve Jobs called to explain that Apple would not keep it in the store; Barrios pushed back because the published rules he had read did not prohibit battery drain, and Jobs replied that a new restriction had just been added. The anecdote is less a story of a loophole than of how quickly a platform can formalize a boundary when a product behaves in an unwanted way.

At 19, Barrios made a second app for a concrete problem: mobile carriers charged a full five minutes if a call went even one second past a free five-minute allowance. His alert app warned users before the limit, and his girlfriend was its first intended user. It became the top-selling app in Mexico and other countries. The economics were unusually simple: a paid, locally running app with no backend, ongoing service cost, or advertising. The transcript gives the original $100 App Store fee and his rough break-even estimate of 100 one-dollar sales, while noting that platform fees also applied.

Success created a services business before Barrios had set out to build one. Multinationals and government organizations contacted him because his app ranked first and asked him to build theirs. With few people able to develop for the early iPhone OS, he took on projects, hired college friends when the work outgrew his capacity, and taught them using a free Stanford online course. He later described consulting as profitable but repetitive: every engagement meant starting another project from scratch. The team sold that side of the business and kept a mobile group to build products that could scale beyond client work.