Sorry to interrupt the bitching about the UI of the website, but...
I would nominate a working familiarity with:
Non-trivial graph algorithms
Serious distributed systems design (ie. building something where anything and everything can fail at any time, possibly in nasty or even byzantine fashion)
Formal methods
Optimization methods (ILP and so on)
Binary decision diagrams
as some other "ninja arts" if we're going to have to use the term "ninja".
If "hack" is the meaningless omniverb of HN, "ninja" has got to be one of its meaningless omniadjectives.
I've never seen a worse layout for mobile viewing. Viewing on my iPhone reduces the content div to a mini scrolling box that immediately had me close the page.
As far as I can tell, this isn't a website, it's just an animated logo.
Is one of the five computer science ninja arts making a website that is completely blank (like, literally nothing) with JavaScript disabled?