Prior to founding Cash App, Lee worked as a software engineer at Google from 2004 to 2010, where he helped design the core library for Android.
After leaving Google, Lee joined Square as its chief technology officer, where he helped develop and launch Square Cash in 2013. The brand has since grown into Cash App. And has tens of millions of users in the US and the UK.
Lee was also known for his active role as an investor in several tech startups, including SpaceX, Clubhouse, and Figma. He was always willing to lend his expertise and mentorship to young entrepreneurs, and his loss will be felt deeply by many in the industry.
Block CEO Jack Dorsey, who cofounded Twitter, called Lee’s death “heartbreaking.”
“It’s real. Getting calls,” Dorsey wrote. “Bob was instrumental to Square and Cash App.”
Lee joined Square, Jack Dorsey’s fintech company, as its first CTO in 2010. At the company, Lee is credited with much of the development of Cash App, a mobile payment platform.
MobileCoin CEO Joshua Goldbard said Lee was “a force of nature,” and issued a statement calling Lee the “quintessential creator, leader, and consummate hacker.”
