DoorDash Software Engineer interview experience

The interviewer wanted me to talk through the data structure I planned to use, and we also agreed on input and output expectations before I wrote the solution. After that, they pushed into time/space complexity and then had me write test cases.

System design came next with payment reliability scenarios. I was asked how I’d handle payment issues when the network was poor, and whether to lean on Redis, a relational database, or something else—so I ended up reasoning through database tradeoffs instead of just describing a happy path.

In the longer version of this path, the overall schedule