Expensify is the fastest-growing expense reporting software. It was also an accident.

In 2008, founder David Barrett was at TechCrunch Disrupt to demo his new fin-tech product: a pre-paid credit card. 

To show people how it worked, David mocked up a simple expense report system to use in his presentation. People liked the pre-paid debit card just fine, but it was the expense report that they were most excited about. 

So David did what anyone in his position would do. He pivoted.

David started programming when he was 6 years old, and dedicated his career to technology. But when it came to Expensify, David turned to something a bit more pedantic: user feedback. Even today, most of their innovation and roadmap features come from the conversations his team has with real Expensify customers, like Yahoo!, Uber, Pinterest, Chubbies, Stripe, Eventbrite... and The Hustle.

These days Expensify reimburses millions of dollars a day (billions of dollar a year) for 35,000 companies and 4.5 million users worldwide.

Want to hear how David did it? Come to Pizza & 40s on May 16 and hear his story.