← DoorDash Interview Insights

DoorDash·Software Engineer·Online Assessment (OA)·Senior

SeniorRejected
Apr 2026Remote

Summary

Bombed a first round with DoorDash and I'm still not fully over it. They said HackerRank and I assumed it'd be a standard coding problem, but they had me write code by hand with no IDE, no autocomplete, nothing. Eight years of switching languages and leaning on tooling caught up to me in the worst way.

Questions Asked (1)

Q1

Implement a solution to an open-ended coding problem by writing code by hand, without an IDE or autocomplete.

Algorithms & Data Structures
Author's notes

I froze on syntax I genuinely use all the time but never type manually.

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AI HintsAI Generated

Suggested Approach

Start by clarifying the problem and constraints with the interviewer, then outline your approach in plain English before writing any code. Write clean, modular code with meaningful variable names, and test with a few examples to catch edge cases.

Pro tip: Narrate your thought process continuously and ask clarifying questions—interviewers evaluate your problem-solving and communication as much as the final code. If you get stuck, simplify the problem or state your assumptions and proceed.

1. Understand and Clarify

Ask clarifying questions to define inputs, outputs, constraints, and edge cases. Confirm your understanding with the interviewer before proceeding.

2. Plan and Outline

Describe your algorithm in plain English, including data structures and time/space complexity. Get buy-in before writing code.

3. Write Clean Code

Implement the solution with clear structure, meaningful names, and comments. Write legibly and leave space for corrections.

4. Test and Debug

Walk through your code with a simple example, then test edge cases. Fix any bugs and explain your reasoning.

5. Review and Optimize

Discuss potential optimizations, trade-offs, and alternative approaches. Summarize the solution and its complexity.

Key Points to Mention

  • Clarify requirements and constraints upfront
  • Communicate your thought process clearly
  • Choose appropriate data structures and algorithms
  • Analyze time and space complexity
  • Test with edge cases and handle errors
  • Write clean, readable, and maintainable code

AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.