Wǒ shì lái miànshì de.
我是来面试的。
I'm here for an interview.
Notes:
我(wǒ): I
是……的(shì...de): a fixed structure in order to emphasize the action.
来(lái): to come
面试(miànshì): interview
Example:
A;你有什么事?
Nǐ yǒu shénme shì?
What can I do for you?
B:我是来面试的。
Wǒ shì lái miànshì de.
I'm here for an interview.