J.P. Morgan Software Developer interview questions

L1 Round coding + Introduction (Self Intro, Explain about project and domain, solving the Questions) L2 Round coding with technical (JAVA Multithreading, Use JAVA Stream api to find the average of given list, Etc... )

I had three interview rounds. The first two rounds were positive experiences, but the third was the worst. For the third round, both the technical interviewer and the hiring manager were almost 30 minutes late. There was no email, phone call, or notification. They suddenly showed up after nearly 30 minutes. The interview was supposed to last 1 hour; however, despite being late, they stuck to the original end time, so I only had 30 minutes for the interview. After introducing myself and my background, I only spoke to the hiring manager for about 5 minutes before he said, "Got it, I've made up my mind." The technical interviewer was even worse. I was asked several technical questions that I wasn’t familiar with, and I don't think he was trying to test how I handle new things because once I started getting to the point, he would abruptly end the question and move on to the next one. It felt like the technical interviewer was more interested in what I didn’t know rather than what I did. In the first two rounds, the interviewers had a positive attitude, as if saying, "We are going to hire you because you know this stuff, and we are happy to work with you." But in the third round, the attitude shifted to, "We are not going to hire you because you don’t know that stuff, and we don’t want to work with you unless you know everything." I’m not even sure they knew what position I had applied for. It was the worst interview experience I’ve ever had. For those of you interested in JPMC, good luck—you’ll get the offer if you're lucky.