I worked at MoSys full-time (More than 5 years)
The company is highly focused on a specific emerging market and carries no debt. People know what their job is and everyone is pulling together.
The company is bootstrapped. They can't do everything that they want to. Revenue ramp is slower than hoped for.
Two turn interviews. First interview is a general interview in which you will be asked various questions in different fields. You don't need to answer every question right. You can pick one direction you are good at. Second round is an interview from your future manager. You will be asked specified question based on the work you will do.
Fixed salary for intern.