In short: unprofessional, inexperienced, and in the best case you have to work with some unpleasant coworkers. Do not ignore the red flags like I did! A Bird recruiter approached me on LinkedIn saying the company is expanding so fast and they are expecting to have 20+ data scientists by the summer. Anyone with some industry experience would know a startup company does not need 20 data scientists in the beginning, and even if it does, it's not easy to find that many good candidates and finish the hiring process in a couple of months. This was the first red flag so I ignored the message. Few months later, at the end of the summer which was past their deadline of hiring 20 data scientists, the same recruiter approached me again and told me they had hired only one senior and one junior data scientist and I would be the seconds senior data scientist. Unfortunately this time I got tempted so the recruiter shared my LinkedIn profile with the hiring manager. Second red flag: They never sent me a job description. A company coordinator arranged a phone interview with an engineer for phone screen. But... Third red flag: He did not call me. The coordinator kept sending me emails, apologizing for the engineer who had not called me and she told me a director wants to talk to me so I said fine.... I finally talked with the second person, the conversation was not technical and he seemed to be nice. In the end he said they would send me a data homework. I wanted to work on the homework over the weekend so I asked them to send it to me on the following Friday. Fourth red flag: They did not send me the homework at the scheduled time, I had to email them and remind them so they finally sent it to me. The homework was fairly easy, one day after I submitted my solution the coordinator contacted me and invited me for the onsite interview. She sent me the schedule: A 2 hour appointment to talk with 4 people, each one for half an hour. This seemed to be too short for an onsite interview. Fifth red flag: The whole onsite interview scheduled for only 2 hours which was a signal that they were not really serious. I arrived at the company and the first interviewer was the same person who was supposed to call me for my phone screen but he had not. Not only he was the type of the person you never want to work with, he seemed to be a little scary showing abnormal behavior. During the interview he never had an eye contact, he was either looking at his laptop or staring at the ceiling. I was expecting him ask software or algorithm questions because of his job title but he asked the most irrelevant least challenging questions like "How do you train a machine learning model?" or "What is a random variable?" The 2nd interviewer was the same person whom I had talked with on the phone, no technical questions came up during the interview. He told me he is very experienced in sensing who is a good candidate so that's why he kept the onsite interview short. He was talking to me like I was already hired. He also repeated they would hire 20 data scientists, but this time, by the end of the year. The 3rd interviewer was another engineer. The first thing you would notice about him was his unprofessional appearance, and he looked like he had just woke up, even though it was an afternoon. He introduced himself and said he knows everything about data in the software engineering sense. He asked very simple questions about machine learning metrics. The 4th interviewer was a ds. He was nice and looked professional but he didn't seem to be familiar with basic ML and data science phrases. He was asking about the homework but he was confused about a topic. He kept using the name of some concept instead of another concept so I was lost. After 10 minutes (the whole interview was 30 minutes) I figured out what he meant so I corrected his question and answered it. 2 days after the onsite I received an email from the recruiter that they wouldn't move froward, but they would like to keep my resume on file (I never sent them a resume he had shared my LinkedIn) He didn't provide any feedback. Remember you are investing a lot of time by working on their homework and going to their office but they don't lose anything except only 2 hours of their employee time. Not only they don't lose anything, they may even learn valuable insight from your data science homework solution and hear good ideas during the interview. So don't let them trick you and do not let them waste your time. You can’t even use it as a practice interview since the questions are not challenging and they don’t provide any feedback. It’s not a place where you can grow and learn.