Celerity Developer interview questions

I was be connected to the company through LinkedIn mail, and ask for sending the resume to them. So, after surveying some information about their company, I decide to mail my resume to the recruiter for reference. They replied me real quick and ask to have a call to me. Then, I schedule a time to have a talk through phone. They mentioned several time of "We are actually hiring some people that really smart...", to that point in the first time, I felt a little odd, but not think too much. (But somehow, after meeting them on site, I start to realize the smart people is actually have GPA around 3.8 or something) After that time of phone interview, the recruiter told me that they would like to meet me on their site to have another interview. For me, I was really happy to be considered, so I actually move several labs and course works to other day to make sure my time is available on that interview day. Then, after I go to the interview, they started to talk more about the information of this role. And I've been told I will meet their hiring manager next week, because she was on her vacation. To everyone who have the opportunity to meet the hiring manager, that probably you did something right with this interview. But the things is that, the HR exactly told me to send mail to them next week to schedule one day to meet. I don't know if I got them wrong or not, after sending them a few mails, they just leave me along and never have replied to me. Well, I don't blame anyone if I didn't meet the capacity they want but if a HR told you that you will have an interview with hiring manager next week. It just shouldn't have nothing to follow up and leave you like that. Having an announcement to meet with hiring manger but no having any follow up mail even I sent a few mails to ask them, and not even a declined mail.

A couple back and forth with the recruiter before setting up the interview. The recruiter was on the ball, quickly responding to any questions I had. First and only interview was in-person at their offices with a couple team leads. The questions were easy, some mix of technical and behavioral.