Jan Koum
San Jose State University · WhatsApp
From Ukrainian Immigrant on Food Stamps to $19 Billion WhatsApp Sale
19 March 2026
Jan Koum emigrated from a small village near Kyiv, Ukraine, to Mountain View, California, at age 16 with his mother. They lived on food stamps. He learned computer networking from books at a second-hand bookstore and enrolled at San Jose State University while working as a security tester at Ernst & Young.
The Simple Messaging App
Koum built WhatsApp in 2009 as a simple, reliable messaging app with no ads, no games, and no gimmicks. He was deeply influenced by growing up in Soviet-era Ukraine, where the government monitored communications — privacy was a core principle.
Billion Users
WhatsApp grew to 450 million users with just 55 employees — one of the most efficient companies ever built. Its popularity was driven by simplicity, reliability, and the fact that it worked on even basic smartphones.
$19 Billion Acquisition
Facebook acquired WhatsApp for $19 billion in 2014 — the largest acquisition of a venture-backed company in history. Koum reportedly signed the deal at the door of the food stamp office where he once collected government assistance. WhatsApp now has over 2 billion users worldwide.
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