Hudson River Trading Software Engineer interview experience

I was given four relatively simple problems. The expectation wasn’t that I’d always produce the absolute most optimal solution—getting to something no worse than O(n²) was acceptable. That changed the feel of the round for me because I focused on clear, correct logic instead of obsessing over the tightest complexity.

In another similar-style round, the questions were also implementation-focused, like counting and scanning tasks. I worked on functions to count how many numbers in an array are greater than a given x and how many are less than x. I also handled a string problem that required