dunnhumby interview questions

Interview consisted of multiple rounds. 1st screening call, 2nd 1 hour technical interview with senior scientist, 3rd 1 hour online MCQ test testing data science knowledge and 4th case study based interview. Overall experience was negative. Every interviewer I interacted with seemed either distracted or disinterested in talking from the start. Even basic pleasantries were exchanged at the start of any of the interviews. Breakdown by parts: 1: Technical Interview: questions about previous research experience and a surprise case study question (which I was not told would occour by the HR) 2: online MCQ test on hackerearth consisting of 29 numerical ability questions, most questions designed to trip you up with subtle differences in the options or were GRE level math questions on linear algebra. 3: Asked for a rather detailed case study based on very vague outline. Given good time to prepare, however nothing was asked based on the work I did in the case study in the interview. Two questions were asked based on K-means and recsys, because I had mentioned those points in the case study — but the questions did not relate to the work in the case study at all. That is to say doing the case study tested nothing as the questions asked on it could have been done in isolation to measure the same effect. Was then asked several critical thinking type questions based on time series data, estimation and graph comprehension. One of the Interviewer was inarticulate and unclear in asking several questions with little context provided. Then there was a coding test, which asked easy coding questions like finding median of an array, length of array with non-recurring numbers and permutation generation, followed by some high school python questions to predict an output. I was told at the end of the interview that I would be given feedback regardless of the outcome. No such feedback has been provided despite a mail to the HR following a generic rejection letter. If a candidate has spent several hours in your interview pipeline with several extra days spent in doing a case study for the interview, the least that can be done is to provide feedback on the task performance. Disappointing to say the least.

Three rounds- 1. HR Round (Basic), If resume gets shortlisted then below rounds; 2. Aptitude test (for filtration amongst resumes) 3. GD based on case study (approx. 2hrs) and, PI (In-depth Resume walkthrough including projects done + Coding (Python, Sql, not necessarily both, any comfortable language + Case study solving live in PI)