Bob Lee
Bob Lee

The Innovator Behind Cash App

Bob Lee was an American businessman and software engineer who founded the revolutionary Cash App. As the chief technology officer of Square, Lee developed and led the development of Cash App, making it one of the most widely used mobile payment services in the world.

Early Life and Education

Lee was born on December 20, 1979, in St. Louis, Missouri, to Rick “Ricky” Lee. In addition, he attended Lindbergh High School where he became known as “Crazy Bob” for his energetic performance in playing water polo. Lee attended Southeast Missouri State University where he pledged Sigma Chi and graduated with a degree in computer science.


Lee began his career as a web developer for Southeast Missouri State University before moving on to work as a technical architect at AT&T. While at AT&T, he developed the aspect-oriented programming (AOP) framework dynaop, which served as the impetus for JavaServer Faces’s (JSF) migration away from AOP.

In 2004, Lee joined Google as a staff software engineer and contributed significantly to the development of the Android mobile operating system. He collaborated with Kevin Bourrillion in 2006 to create the dependency injection framework Guice, which earned them the Jolt Award in 2008. In January 2010, Lee joined Square as its chief technology officer and led the development of its Android and iOS apps.

In 2013, Lee developed Cash App, which was then known as Square Cash. He left Square in 2014 to invest in several tech startups, including Clubhouse, SpaceX, and Figma. During the COVID-19 pandemic, Lee helped the World Health Organization with its app. In 2021, he joined cryptocurrency payment firm MobileCoin as its chief product officer.

Tragic End

However, on April 4, 2023, Lee was fatally stabbed in the Rincon Hill neighborhood of San Francisco. The news of his death shook the tech industry and the world.

Bob Lee was an innovator and a visionary who made a significant impact on the tech industry. People will always remember his contributions to the development of Cash App and other groundbreaking technologies.

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