Cognizant Senior Developer interview questions

Cognizant is the worst company I have ever interviewed for. Twice they set up interview for me on Saturday without informing. I was called 10 mins before the interview to check if I was joining or not. I was traveling at that time. However I gave the interview. Third time the interview was scheduled on a working day at morning 9.30 am. I had to take half day for it. I joined the invite but the interviewer never joined. There was no prior information given to me. I sent them the mail regarding my disappointment but they don't have the backbone to even accept their mistake and reply.

In this interview process very smoothly having some question with problem solving and theoretical with normal to advanced question regarding Java Script and React js HTML, CSS. Typescript, Jest, Scss