Just missed millions: These 8 people walked away from early jobs at billion-dollar companies
Robert Cezar Matei missed his chance to join early Facebook, Square and Instagram teams.
It's impossible to know which startup is going to become the next billion dollar success story, and the risk of letting a golden opportunity slip through your fingers is something that tech workers grapple with every day.
While some who turn down lucrative offers still achieve success - Instagram's Kevin Systrom is a prime example - others may come to live in regret.
Here are how some Silicon Valley techies missed opportunities to make millions at companies like Facebook and Instagram: