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      Python Developer Interview

      26 Dec 2016
      Anonymous interview candidate
      New York, NY
      No offer
      Negative experience
      Difficult interview

      Application

      I applied through a recruiter. The process took 3 weeks. I interviewed at HedgeServ (New York, NY) in Nov 2016

      Interview

      This was in their general ledger group for which they needed P&L experience. I had a phone interview, a small follow-up assignment, and three on-site interviews. The phone interview required me to be on a computer to do a coding exercise. Going on-site three times was excessive. They were a bit disorganized in that a scheduled interviewer could not meet me, and other interviewers were often late. It also struck me as odd that there was never a receptionist present at their front desk, making it unreasonably difficult even to enter their office. I did fine in the technical rounds and in the discussion with the tech manager. In the final interview, I felt that the product owner on the business side was unexpectedly difficult, and so they rejected me. Their stack includes Python 2.6 which is an ancient language that no professional should have to work with. Their expected work hours are at least 8:30 to 6.

      Interview questions [5]

      Question 1

      Implement the power(int b > 0, int n >= 0) function. What is its time complexity? Extend the function to also accept int n < 0. Assuming the time complexity of the implemented function was O(n), also implement an O(log n) variant. Note that use of recursion is acceptable for the O(log n) implementation, but not for the O(n) implementation. Only an iterative implementation is acceptable for the O(n) variant.
      Answer question

      Question 2

      What is the formula for determining the number of permutations? Write a function to return the permutations of a given string, e.g. "abc", that are equal to the length of the given string. If this function is implemented using itertools, also implement one without using itertools. Note that use of recursion is acceptable.
      Answer question

      Question 3

      (TDD pair programming) Incrementally implement a bowling score calculator.
      Answer question

      Question 4

      What is an inner join? How do you determine the optimal number of worker threads? What is a deadlock? What is an algorithm to prevent deadlocks? What is a formula for determining the sum of integers from 1 to n? Optionally provide a mathematical proof for the correctness of the formula.
      Answer question

      Question 5

      Do you have experience calculating P&L greeks? What did you calculate?
      1 Answer

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