@starterstory: 22 years old. $160K/month. One year in. But the app isn’t the secret, it’s how he decides what to build. Meet Mauro. He built Symmetry, a gym tracking app that’s now one of the biggest names in the Spanish fitness market. He went through 3 phases: > Phase 1: build what we wanted. Terrible. > Phase 2: build what users asked for. Mediocre. > Phase 3: treat every feature like a science experiment. $160K/month. His system: > Set ambitious quarterly OKRs (easier to move metrics when you’re new) > Track downloads, activation, retention, ARPU > Start from a problem, not a solution > Write hypotheses, then A/B test everything for 2+ weeks > Kill what doesn’t move the needle, double down on what does One example: adding a single screen at the end of a workout increased retention by 3%. Meanwhile two full redesigns of the home screen moved nothing. Most builders ship features and hope. Mauro ships experiments and reads the data.

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Saturday 12 September 2026 18:50:22 GMT