You don't just look at the code, you do a "git blame" and see who wrote it and then discuss the code with them. The Twitter engineers are likely being interview

You don't just look at the code, you do a "git blame" and see who wrote it and then discuss the code with them. The Twitter engineers are likely being interviewed to see if they should keep their job. Evaluating engineering staff first hand is an important step to evaluating a company's portfolio of products upon taking it over.