NTT DATA Software Engineer interview questions

In 12 years of working in this industry, this is the single most ridiculous, rude, unprofessional behavior I've ever experienced: Waited for 30 minutes in the lobby after the scheduled interview time. Eventually someone showed up and took me upstairs. The interviewer told me my resume(which I had previously submitted) was too short and he didn't know what questions to ask me. He walked me to the elevator, pushed the 'down' button, and walked away with a perfunctory 'thanks' without looking at me or offering me a handshake. This entire sequence of events happened in less than 10 minutes. Absolutely absurd and unacceptable behavior. This is the epitome of what is wrong with recruiting / hiring.

The first part of the interview process was a home assignment. The assignment was to make some backend service with database integration and everything had to be covered with unit and integration tests. Also, they asked for the documentation with architecture and design overview, testing approach, build and deploy instructions, etc. The goal of the assignment wasn't only to test the programming skills, but also to test enterprise engineering practices (project layout, error handling, etc.) The second part was the on-site interview. They've asked me to go through the assignment I did at home and to explain some parts of the code. Nothing to difficult really.