Doordash Backend Interview Experience | Reject

I recently went through the DoorDash interview process for a backend role and wanted to share my experience. Unfortunately, I was rejected after completing all rounds.

Round 1: System Design + Domain Knowledge

The problem I faced was centered around an Ads Click Aggregator. The interviewer was from the Data Engineering team. I found this conversation quite challenging, partly because the interviewer seemed relatively new to conducting such design interviews. The flow felt a bit off, and the discussion focused on areas I didn't feel were core to the problem, making it hard to properly showcase my system design skills.

Round 2: Hiring Manager Discussion

This was a straightforward round, involving standard behavioral questions.

Round 3: Debugging

In this round, I was given a piece of code that contained 3–4 bugs, which I successfully fixed. The interviewer then followed up with questions about optimizations, which I was also able to address.

Round 4: Code Craft

I had anticipated this round would evaluate my understanding of OOP principles, class creation, and overall code structure. However, the interviewer seemed solely concerned with the problem-solving logic and getting a running code solution.

Overall, I left feeling unsatisfied with the interview process, primarily due to a lack of alignment in expectations and how some of the interviews were conducted.