Binance Backend Engineer (Java) interview questions

The first was with HR, focusing on my past experience. The first technical round was with an engineer based in China, primarily discussing my previous work experience and some basic Java questions, such as explaining HashMap. The second technical round was also with an engineer from China, again covering my past experience but with more emphasis on system design questions. Unfortunately, despite the job description not specifying blockchain knowledge as a requirement, the interviewer asked questions on this topic, which I wasn't prepared for and ultimately led to my rejection.