Is the preposition "in" necessary after "Mike"?
The phrases "let's get someone in" and "bring someone in" mean "ask someone to come to a location and do a particular task". Here, the speaker is saying that "Mike" should be asked to come and solve their IT problems. Therefore, "in" is necessary here. Here are some examples using "let's get someone in" and "bring someone in": Ex: Let's get someone in tomorrow to fix the sink. Ex: He's going to bring someone in soon to install the security system.