Spotify Sr. Software Engineer interview questions

First stage: internal recruiter. asked me about past projects/experiences, why I would work for Spotify, what I contributed the most in my career, what is my current contribution to a project, some high level technical questions around a product, tech stack, soft skills and if I ever mentored someone. Definitively a good experience but do not underestimate this part Second stage: 1,5 hours technical with 2 senior Engineers 1. Again, questions around my position, my career development, my current project, very technical questions around what would I change in my project, how would I improve, what tech stack would I use and why, Resource wise what can I improve. Then some questions around Spring/Spring boot, memory and caches, database. Please highlight what is you role and responsibility as apparently this was one one the point they didn't like although I had a lot to say. 2. Tech exercise around removing dups from a string with a given number of allowed dups - think about the task, ask question, write code thinking out of loud, test it manually. Few questions around that such as if I would have written the same in a standard working day. The code though, was compiling and working as I copied and pasted. 3. Random question around UDP/TCP differences, indexes in DB, man in the middle attack, thread, event stream programming (as I think my current role involves that), spring annotations, Rest vs SOAP vs Thrift Feedback: I didn't pass this stage but when I asked for feedback I almost received none. On call the recruiter said they preferred someone more expert but I didn't do anything wrong or to note. The only point was about not well exposing my current role and responsibility which is weird because I went through a lots of things. For this reason I would not give a thumbs up to Spotify Interview

30 minutes with manager, 45 minutes tech interview. The interviewers asked relevant questions, fit into the time frame, nice communication. Manager asked about experience, most challenging tasks, conflicts, how I use psychology at work, feedback from peers. Tech interview was coding-only, a complete surprise for me, as last months I focused on system design and cloud. Web-IDE complaining on weird errors, often hard to hear interviewers (bad sound signal/noise ratio) especially comments from 2 people over me solving a task and sharing thought process and ways to move forward / improve the solution, clarifying the context. The feedback I got: communication seemed not quite clear. Well.