I applied through college or university. I interviewed at Hexagon (Hyderabad) in Oct 2018
Interview
First they conduct a paper based test followed by 2 technical rounds and 1 hr round. The written round consists of basic mathematical questions and some questions related to physics and chemistry of intermediate knowledge.
I applied online. The process took 2 months. I interviewed at Hexagon (Zug) in Sep 2018
Interview
Phone Interview. I had a 30 minute phone interview with them. They asked me a bunch of questions about the company including why I was interested in them, etc.
Easy interview. A few competency based questions only. Got through interview on campus. Only one round of interview. Nice interview process, makes you feel at ease. A few software skills were tested but not too hard.