I applied through college or university and the process took 2 weeks - interviewed at Knight Capital in June 2013.
Interview Details – Contacted by HR.
Scheduled the interview.
Met with 4 associates, and 1 director.
Heard back in one week.
Interview Question – None. Behavioral questions alone. Answer Question
I applied through a recruiter and the process took 6 weeks - interviewed at Knight Capital.
Interview Details – I was initially given a written tests, consisting of 4 programming questions/problems. Makefiles and (not necessarily comprehensive) test cases were provided.The test was un-timed, but we were supposed to report how long we took in completing it. My test took roughly 4 hours.
We scheduled a phone interview about a week later. There were more technical questions, as well as the typical behavioral questions. At the end of the interview, I was asked to complete an implementation of one of the programming questions we discussed and send the result via e-mail.
Soon after, I had a similar second phone interview. Again, a mix of technical and behavioral questions, with a post-interview programming exercise.
I was invited to an on-site interview, which lasted for the entire day. I interviewed with 4-5 onsite software developers one-on-one, as well as with another developer in a different location via satellite and a group lunch. All of the interviews were technical (except for the lunch), with a mixture of brain-teasers, math problems, and programming exercises (using a notebook or whiteboard to write out solutions). Even during the video conference, I was grilled on material I'd mention on my resume.
Knight made me a very competitive offer within a few weeks of interviewing.
Overall, I was very happy with the entire process. All of the technical questions and tests were interesting without being overly burdensome, and I appreciated the extent to which they try to vet candidates. I was also very impressed with all of the employees I met. Overall, the atmosphere seemed relatively relaxed, but still meritocratic and productive.
Interview Question – Suppose you have a stack of pancakes of pairwise distinct sizes. You wish to order the pancakes the pancakes by size, with the largest one on the bottom. The only operation is available to you is a spatula flip: You can insert a spatula anywhere in the pancake stack and flip over the stack above the spatula, reversing the order of the pancakes. For instance, in the following stack
bottom . 2 3 | 5 1 4 . top
Inserting the spatula between 3 and 5 will give:
bottom 2 3 4 1 5 | top
Design an algorithm to sort the pancake stack using this operation. Write a program to execute this algorithm in C++. What is the runtime efficiency (precisely, not just in Big-O time), assuming that a flip is an atomic operation? Is your algorithm optimal (again, precisely, not just asymptotically)? View Answers (2)
Reason for Declining – I had multiple competitive offers, and another offer was better based on some other factors unrelated to the companies directly.
Interviewed at Knight Capital
Interview Details – I applied for the quantitative strategist position on their career site. Then I got three technical phone interviews, then an onsite interview. They ask a lot of problems about algorithms, such as sorting and searching problem.
Interview Question – Suppose you have a one-dimensional array A with length n that contains both positive and negative numbers. Design an algorithm to find the maximum sum of any contiguous subarray. Answer Question
I applied through a recruiter and the process took 3 weeks - interviewed at Knight Capital.
Interview Details – Contacted by a recruiter on Linked in. Had a brief conversation that detailed what they were looking for. Next had a 1 hour phone interview with the manager that involved some design and logic questions. So far so good. Next was a take home development project. Finally came to the office in Jersey City phone further interviews that consisted on 2:1 meetings. The first of these must have been some kind of stress test because their internal video conference system had this very strange echo making the person on the other end unintelligable. At one point they asked me to help fix their system. Very strange experience.
Interview Question – I'd say the most difficult questions came from those on the video conference line which I could not begin to tell you what was asked. It sounded like the Chevy Chase na-na-na's from Caddyshack. Answer Question
I applied online and the process took 2 months - interviewed at Knight Capital in April 2013.
Interview Details – Written test/ 3 1-hour-long phone interviews / On-site interview.
Written test was not that hard and the rest of interviews are pretty similar to other hedge funds. They will ask Probability, Programming Questions
Interview Question – What is merge sort? Answer Question
I applied online - interviewed at Knight Capital in May 2013.
Interview Details – phone screen.
How hashmap works.
difference between interface and abstract class.
walk through linked list, using double pointer.
Interview Question – advantages of immutable object Answer Question
Interviewed at Knight Capital
Interview Details – First I had a phone interview with the hiring manager and then I went in for an on-site with 5 other developers who asked me a variety of Java and DB questions, from data structures to basic OO design to design patterns. Also some simple java queries. Nothing too difficult.
Interview Question – There was one developer that went over several pages of printed Java code with me, each page a different method. I was asked questions about each page, like whether it would compile, if there were logic errors, concurrency problems etc. Answer Question
Negotiation Details – My recruiter handled it so it went pretty smoothly. I was given an offer that I was satisfied with.
I applied online and the process took 1+ week - interviewed at Knight Capital in March 2013.
Interview Details – Interviewers are smart, nice but the interview questions are challenging. Could not answer all of the questions, but still got an offer. Some math and probability questions are very hard. Some basic algorithm questions are also asked. Not many derivatives pricing questions, but quite a few questions about basic market intuition. In general, the interviews are hard, but still doable.
Interview Question – A random walk inside some boundaries. Ask to calculate the probability as time goes to infinite. Not fully understand the question. Answer Question
Very Difficult Interview
I applied through an employee referral and the process took 2 weeks - interviewed at Knight Capital in August 2012.
Interview Details – Two technical phone interviews then in-person interview. On the first phone interview, interviewer asked about randomly positioned points on a circle, then to step through an analysis of Buffon's Needle. On the second phone interview, interviewer asked about a gambling game which was sort-of inverse Prisoner's Dilemma with repeated playings
Interview Question – Buffon's needle. I was familiar with it and still had a lot of trouble walking through the analysis. Answer Question
I applied through a recruiter and the process took 2 days - interviewed at Knight Capital in August 2012.
Interview Details – 1:1 phone interview, on-site 1:1 meetings with 4 others, 1:1 with the md, 1:1 with the CTO and 1:1 with the head of operations
Interview Question – everything seemed straightforward... very basic fundamental questions which you either know or you don't... got asked the differences between a set and a list... wondered if that was a trick question Answer Question
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