just say 谢谢~

I would simply say 告辞，instead of 谢谢 at the end of an interview because you still don't know whether you're going to be signed or not.

In Chinese, it is not common that using " thanks for your attention" （谢谢你的关注）。 Normally, we just simply use " Thanks" (谢谢). At the end of interview, you can use " Thanks " (谢谢）

Thank you, it's very useful to know this.

I agree .we usually say谢谢 at the end of the interview，“谢谢您的关注 ”might be used more in writing to respond some news officially ，especially in the case many people are concerned about and it‘s more often used in the beginning。if it’s a response to one person，we use 谢谢您的关注/感谢你的关注。if it‘s a response to many people，we will use 谢谢大家的关注/感谢大家的关注。if a interviewee says 谢谢您的关注，it’s too polite and too official，a little bit weird。