Look at the top review. They are going to ask you how to design a smart meter for multiple apartment buildings. Then, they are going to ask you about the 2Sum closest to 0 problem. Next, they will give you code and ask you to talk them through it. Finally, they will present a behavioral interview.

Another thing to consider: The people who interview you are not going to be the ones you actually work with.

Oh, and if you pass CodeSignal, you need something in the range of the 700s or higher. This is more forgiving than most companies that use CodeSignal.

Mini-rant: If you are going to ask everyone the same questions and then base your decision on whether or not they got the correct answer, then the people you hire are going to be the ones who memorized LeetCode/Glassdoor answers, not the ones who actually solve problems.

Two sum closest to zero

System design interview for a smart meter system

Interpretation of Java code for an imaginary chat AI that worked with an imaginary database

Four CodeSignal questions to get to this point