Phone interview. And during the interview, they first asked me about some very general questions about my resume, and then asked me to do some basic calculations very quickly. After that, he introduced their internship program and also told me about the recruiting process. Basically, the interview was not very long and you do not really need to prepare much for it.

I applied online through the company's website. I was contacted by email around two weeks after I applied. They arranged a interview. The interview was pretty short. just fit questions. All about your resume. No technical questions. In- site inerview