Got a phone screen and then a on-site technical interview leading by a half hour HR interview. During the technical interview, the hiring manager asked me some basic Python concepts, like how to define a list, how to calculate the power of a. Then he said that he doesn't familiar with C programming language, which I used several years and he wants to arrange another on site interview and invite another enigneer to come and test my C skills. But in the followed up interview, the other engineer still asked me Python questions and said that C is not necessary for this role. No offer provided. They definitely waste the time of the both of us!