I applied for two different Delta jobs: one for data scientist, another for full stack data science engineer, which I mistakenly thought was a data scientist position. First round was a five-minute recorded video interview. Second round was the final(!) in-person interview. Literally nothing else. Furthermore, the recruiter wouldn't tell me which position I was being interviewed for. They only told me that I was being considered for "OAP roles," which I later learned meant basically their entire operations analytics group. During my interview, there were at least 10 other people also interviewing on the same day, and their schedule indicated that 3 other interview days were planned. However, they also said that they were hiring for a dozen or more roles and that this process was meant to prevent a possessive and aggressive attitude among hiring managers for acquiring the best talent. In-person interview consisted of three stages: a technical case presentation with a manager, a "coffee chat" with an individual contributor, and a behavioral interview with 2 managers. Keep in mind that none of these people were the hiring manager or on my prospective team. They were just random managers from within OAP. After my interviews, they all said something to the effect of "Well, you'd be great for our decision sciences team." Great, let me speak with them. I can't imagine how someone could accept a job without speaking to the hiring manager once. Overall, a very weird experience. Also, I accepted a different job offer soon after my Delta interview and in the weeks since I have received no less than 4 rejection emails from Delta.

The interview process consisted of several stages. First, I had a phone screening with the recruiter. Then I had a 30-minute phone interview with the hiring manager. After that, I was given a dataset and a set of tasks where I needed to perform data preparation, exploratory analysis, and build a prediction model; I uploaded my completed work for review. Next, I participated in a 4-hour panel interview with a team of 4–5 people, during which I walked them through my entire workflow and answered technical follow-up questions. I believe there was also one final step after that, completing the overall process.