Revolut Senior Software Engineer interview questions

I participated in 3 stages: 1 - Interview with an HR person. He asked basic questions that every HR asks and some more techniques: How complex is HashMap search, what is ACID. 2 - Interview with a very attentive and friendly developer. I needed to develop some simple string manipulation methods. I developed everything with TDD. The feedback was positive and I went to step 3. 3 - Two very rude developers, looking discouraged and sad with life. They asked questions about multithreading, CAP theorem and started to go very deep and ask questions that maybe the 5th page of google search can answer. Questions that don't make any sense in the day-to-day life of a software developer. In addition, the two were exchanging messages, I could hear their noise typing and the message later reaching the other. I felt disrespected.