I had 3 rounds - (1) Hackerrank test, (2) Technical DS interview, (3) Virtual on-site interview comprised of 2 technical rounds and 2 non-technical rounds. The recruiters replied promptly and the whole process was smooth.

After applying, I was contacted within a few days by a recruiter for an approximately 30 min online screening. While the recruiter was nice, she didn't seem overly interested in learning more about me as a person or my background. Nonetheless, I very quickly received an invitation for an online technical interview with a senior data scientist located in the US. This interview lasted approximately one hour and purely consisted of technical questions about topics such as data manipulation in Python/Pandas, statistics, SQL, etc. For most of them, we used a shared browser-based text editor. Frustratingly, we had some connection issues which made communication difficult. While I tried to check my own connection but couldn't find any problems, the interviewer mostly chose to ignore the issue. Most questions were not overly difficult, but the connection issues made it hard for me to concentrate on them properly. A few days later, I received a standard template email informing me that they would not move forward with my application. No reasons for this decision were provided. Further, they explicitly stated that they are unwilling to provide any feedback. Given the amout of time that a candidate has invested at this point, I find this very disappointing.