Is there any chance that my macbook will get installed something from repair?

Unless you are an international-calibre activist, the risk that repair shop hacked your Mac is extremely low.

They make their money from reputation of success with repairs, and allegations (or even a rumor) that they hack your computer while servicing would ruin their reputation.

yeojinbae wrote:

Hi, I just repaired my MacBook from an unauthorized repair shop and that took several days.

I would like to ask if there is any chance that they may have installed something on my MacBook. I don't see any recently installed software, but I am wondering if it is possible to install some spyware on the hard drive.

Thank you!

No. I would not be so concerned.

Why do you pose the question, are you having an issue