The process is serial, as many people have described. You can only move forward if you have completed the last interview.

I had 4 coding rounds:

• 3 LeetCode
• 1 React

And a Hiring Manager interview.

I did well on 3 of the coding rounds; however, on one of them, the interviewer gave almost no description or example input or output.

Most of the interviewers were very helpful.

The final Hiring Manager interview involved a problem about probability, which I bombed. I have no background in statistics or any context for this kind of math-related thinking.

Overall, the experience was good, but if a candidate passes 3 coding rounds, why is the hiring manager asking more coding? I would have preferred system design.

In any case, there is usually one interviewer that sinks the entire effort. Unfortunately, in this instance, I believe it was the hiring manager.

Typical LeetCode problems often include:

• 2D array problems
• Binary trees
• Probability