HERE Technologies Lead Software Engineer interview questions

a phone screen with a recruiter, then half an hour technical phone interview with a manager, then 3 hours on-site interviews with 6 people. The process was quick, the thing is, they told me they were looking for a more senior guy, so not sure why they would waste my time and invite me for 3 hours of onsite interviews.

applied online, got first phone interview within a days, talked to HR, then setup interview with manager for couple days later. Easy talk with manager, asked lots of questions about everything from Jasmin javascript to agile methodology. Got on site interview two weeks later. The manager and senior engineer asked me about my past works, and they specifically asked how did I implement google firebase Auth protocol in MVC architecture. They did wanna see the call back code, in javascript, and how I managed the call back. They were very interested in javascript. I explained that and showed the codes on my blog. Then a two data analyst came to interview me for next 45 mins. asked about how well do I know MySQL. The guy gave me three tables, and asked me to find the new devices occurred in month of July and asked me to write sql query on the board. Next they asked about polymorphism and virtual function. The last group came in to ask deep questions. The person put aside my resume and started asking me to remove duplicate in an integer array in javascript. I asked if I could do it in C and C++, he did not like it, but I did solve the problem and he stared asking questions like what is difference between new foo(), and foo foo. What is a DLL, what is class VS function, what happens with complier when it sees a class vs function, what is difference of struct and class, and why not building function and methods in a struct VS a class, what is protected, public and private member. How does complier allocate memory for a class, vs function or a method. They some questions about what is an instance of a class vs a class instructor and how does complier behaves when it sees these stuff.