Plumerai interview questions

The first round was a call with the HR, who asked about my experiences and past projects. In the last 10 minutes of the interview, she asked me a couple of technical questions on Python (what are getters and setters, are lists mutable or immutable, etc). I cleared the first round and was advanced to the next one, which was a technical interview on Python coding. The questions asked were simple (printing some kind of a sequence, checking if a list contains duplicates and vectorizing it). Although I was able to get correct answers for all these questions, I was still rejected the very next day. The overall interview stages were simple, but the experience was poor. No feedback and rejection even after getting all the answers correct. More importantly, it seems the company has not established proper revenue streams and is still currently targeting a very specific market which can cause trouble later on. This was based on my conversation with my interviewer. Proceed with caution.