DigiLens Optical Engineer interview questions

I applied online and received a reply from a hiring manager. I had four skype interviews over the course of a month with the CEO and and director of optics. At the last one I was told that I would be contacted soon. I waited two weeks and sent a follow-up email....no response. Another just to be sure...and no response. I was disappointed that what I thought was an exciting company was so bad with this process.