Infinera Principal Mechanical Engineer interview questions

Hiring process was very slow. It took over 2 months, 60+ emails and many hours on the phone. The interviews were simple except one. People were mostly nice. At the end, they told me that I was perfect but they wanted to try someone else before making a decision. Never heard back from them. Later, I saw that they had hired someone else and just wanted to give me the impression that I was still in the process.