Jacob Bijani joined the site in 2008 and is one of the first five employees of the company.
It is unclear why Bijani is leaving so quickly, but the timing of the acquisition and is departure seems suggestive.
Reads his farewell letter:
Today was my last day at Tumblr.
Five years ago I joined a team of four as Tumblr's first designer, creative director, and product engineer. That team has since grown to 182 of the most wonderful and talented people around.
I'm so proud of what we've all created together, and it's been a privilege to contribute to something beloved by so many. I can't wait to see what's next for the product; I'm sure it will be nothing short of incredible.
There's still a lot more I want to accomplish, and I'm really excited about this next chapter. For now, I'm going to take some time off to digest the last few years. I have about a dozen different projects planned, so expect more from me soon!
Written by: Andre Yoskowitz @ 1 Jun 2013 18:43