How to impress Unity Developer Recruiter

I'm a Unity3d developer with nearly 4 years of experience. This Wednesday, I will be having a technical interview for a new job and I'm a bit nervous about it. It will not be my first job but this one I believe will help me reach my full potential for the future.

What do you guys think a Unity3d developer should know and at what level? I would like to know your opinions about it.

What technical skills would you be looking for if you were to hire a game developer?

I really want this job, any help would be great!

Thank you everyone.