Revolut Observability Engineer interview questions

3-4 stages of technical interviews, questions ranging from dashboard design to observability pipeline design to kubernetes fundamentals. Final stage with somebody who was maybe an engineering director of sorts and seemed like they were the decisionmaker but they didn't even properly introduce themselves so I am not sure. I felt that the technical interviewers were not knowledgeable enough to be able to understand the nuances of my answers as they were all less experienced in the subject matter at hand than me. They were also all uncharismatic and seemed lowkey depressed or angry at life. I put interview difficulty as average because they were long and dry, the technical questions themselves were pretty easy.