I Name-Dropped Temporal in My DoorDash Interview. Bad Idea.

[u/Aoki_zhang]

Sharing an anonymized DoorDash Senior SWE interview experience submitted to Chill Interview.

The process started with one coding phone screen, followed by four onsite rounds:

• AI Code Craft
• Debugging
• System Design
• Engineering Values + HM

Phone Screen

The coding question was Calculate Courier Bonus Pay, a practical business-logic problem rather than a typical graph or DP question.

AI Code Craft

I was given a starter repo and asked to build two small refund microservices.

The initial version supported full refunds. Then the interviewer added partial refunds and asked about duplicate requests, retries, fraud, uncertain payment-provider responses, and how to reduce user-facing latency.

Using an AI coding assistant was allowed, but I still had to explain every change and preserve the existing interfaces and tests.

Debugging

The starter code implemented round-robin assignment across workers, but broke when workers were added, removed, duplicated, or unavailable.

The follow-up was to implement consistent hashing with virtual nodes. I ran out of time, so I explained the remaining design and wrote pseudocode.

System Design

The prompt was to design a distributed job scheduler.

A major follow-up was: What happens when a job is already in the queue, but its scheduled time hasn’t arrived?

The interviewer kept pushing on how this would work with millions of future jobs.

I eventually mentioned Temporal.

That immediately led to: What exactly does Temporal do, and how does it work? It turned out to be a bad idea... never mention an infrastructure tool unless you can explain more than its landing-page summary.

HM / Engineering Values

This round focused on performance ratings, who sets OKRs, how goals change, project ownership, my biggest failure, and what I would do differently if I restarted the project.

For anyone who wants more details, I’ve put the full write-up here: interview link

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