Hudson River Trading Software Engineer interview experience

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Candidate report, summarized by Dataford

One interview started with me talking through a research project from my resume, but it quickly became clear it wasn’t really what they were looking for, so it wasn’t expanded much.

The real technical question was about probability: I was asked to compute the expected number of inversions in a random permutation of length N.

I wrote a function in CoderPad to count inversions in a permutation, and there wasn’t any time complexity constraint specified, which was a relief because it let me focus on correctness. Then the interviewer had me run experiments with N=200 and 1000 trials, tracking the mean and variance. I ended up repeating the experiments five sets of the same kind and reporting the range of means, and then I worked with the distribution of the mean from the

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