No matter how many big companies you worked for, your future employer will still pay more attention to your personal projects, especially open source. Well, provided the employer is savvy enough. Your personal code is much more valuable than the big name of some Facebook you have in your CV. They are just job places, but your code is something you managed to created. So, don't waste time and start your own pet projects now.

The video is here: https://youtu.be/_ga2tP3wZbI