Sidekiq. It's a wonderful project and has formed the basis of so many projects I have worked with over the years ever since it's inception. It's also a great example of an OSS project with a healthy commercial offering.
Before iOS10, you could press the little camera button from the messages app and a camera would just launch. You take the pic, and send.
Now all you get is this tiny preview rectangle at the bottom. It doesn't launch a full camera so is useless for most cases. That's why I have to open the "real" camera app and take the picture and come back.
Next to the "tiny preview rectangle," there's a gray arrow indicator that suggests swiping right. If you do that, you'll find a button you can tap for the old functionality.
So now it's tap-swipe-tap instead of just tap, but in exchange the old functionality of sending an existing photo has changed from a long series of actions to just tap-tap-send.
Yes, people who try and inject a little fun into their interactions are just the worst, aren't they? In a professional setting too. It's just shameful behaviour. Also, I'd be really cross if one of my children should stumble across this "tender lovemaker's" blog. I hope this guy is ashamed of himself.
Practical object oriented design in Ruby by Sandi Metz is hugely popular, and not just inside the Ruby community, and rightly so, it's one of if not the greatest texts on programming I've read.