If you can't talk about design implications quantitatively, nor have a rigorous understanding of how to build data structures - not memorize anything - you can'

If you can't talk about design implications quantitatively, nor have a rigorous understanding of how to build data structures - not memorize anything - you can't get mad that I make $100,000 more than you do and work half as much. If you're a career programmer, and you've never bothered to hone these skills, don't be surprised when you can't easily find work in 10 years. The cheaper guy or girl who comes with less risk will beat you.