Depends on the job. If it's a creative atmosphere anything goes. If conservative then a pale neutral color. A couple of choices would be Metro chic by Sephora for opi or Demure Vixen by Essie. Both pretty easy to find. Good luck!
I would go with a pale color and not something bright like red. Since your nails are short, you can skip the nail color also. Make sure your nails are neatly trimmed. Good luck on your interview! I hope you get it.
Dependant on the job but short manicured dark colors look good too if the nails have a little length like the models, actresses etc... Are wearing, nothing wrong with being trendy as long as it goes with your attire and like I said are nice and filed and not too short! Doesn't have to be clear or a light color unless that fits your personality! Good luck anyhoo!!!
Most important tip is to bring attention to yourself and what you have to say as a potential employee. For example, use the quick look in the mirror test then eliminate the first accessory you notice. To that affect, make sure your nails are nicely trimmed and clean.