I'll be the first to answer-
the reason they hire so many programmers is because they release new code every day, 2x a day.
Quote:
Facebook updates the site with new features, product improvements, and bug fixes every work day. This can sometimes be a huge challenge, given that there are hundreds of engineers working on thousands of changes every week, and many of those changes immediately impact the over 800 million people using Facebook worldwide. But Chuck Rossi, who has worked in release engineering for over 20 years and started as Facebook's very first release engineer in 2008, helps make it all happen. Read on to learn about the team behind the daily push and the tools and processes they built to make it possible.
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https://www.facebook.com/note.php?no...50660826788920