I hate what Silicon Valley companies (Google, Amazon, etc.) have done to the software engineer interviewing process. It heavily favors recent college graduates and destroys job mobility for older senior engineers who have a busy life.

For example, look at the answers to this Quora question about interviewing:

http://www.quora.com/How-much-time-did-you-spend-preparing-f...

The first reply mentions spending 5 weeks of studying, 2.5 hours every weekday and 8 hours on every weekend day. That's 28.5 hours of studying every week. 5 weeks of that is 142.5 hours. And he also spent time doing mock interviews.

I have a family and as a senior engineer I'm busy with work. What little free time I have is spent keeping up with new technologies. It has been many years since college. This process is basically very hostile to most senior engineers who have years of experience. I wish more companies would recognize this and change their process.