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78+ DoorDash questions

DoorDash interview questions and how to prepare

Analytics-heavy and operational; expect marketplace case questions. Below: the questions candidates report from DoorDash interviews, sorted by how often they come up, plus original practice in DoorDash's style.

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ZorixOS tracks 78 community-reported DoorDash interview questions, drawn from an open-source dataset of real interview reports and sorted by how frequently each one comes up. Every question links to its source. Alongside them are 78 original ZorixOS practice questions written in DoorDash's known interview style (not claimed as asked at DoorDash), so you can rehearse the real format. Practice any of them out loud in a free AI mock interview tuned to DoorDash.

Updated July 2026

How DoorDash interviews run

What candidates consistently report about the loop, so nothing surprises you on the day.

  • Analytics-heavy and operational; expect marketplace case questions.
  • Interviewers reward structured thinking about three-sided tradeoffs.

DoorDash interview questions candidates report

Community-reported from real DoorDash interviews (open-source dataset), most-asked first. Showing 60 of 78. Each links to its source.

  1. 132 Pattern
    ArrayBinary SearchStackMonotonic Stack
    Medium100% asked
  2. Longest Increasing Path in a Matrix
    ArrayDynamic ProgrammingDepth-First SearchBreadth-First Search
    Hard100% asked
  3. Walls and Gates
    ArrayBreadth-First SearchMatrix
    Medium100% asked
  4. Binary Tree Maximum Path Sum
    Dynamic ProgrammingTreeDepth-First SearchBinary Tree
    Hard92% asked
  5. Single-Threaded CPU
    ArraySortingHeap (Priority Queue)
    Medium91% asked
  6. Maximum Profit in Job Scheduling
    ArrayBinary SearchDynamic ProgrammingSorting
    Hard84% asked
  7. Search Suggestions System
    ArrayStringBinary SearchTrie
    Medium83% asked
  8. Koko Eating Bananas
    ArrayBinary Search
    Medium76% asked
  9. Design File System
    Hash TableStringDesignTrie
    Medium75% asked
  10. Shortest Distance from All Buildings
    ArrayBreadth-First SearchMatrix
    Hard71% asked
  11. Check if One String Swap Can Make Strings Equal
    Hash TableStringCounting
    Easy68% asked
  12. Most Profit Assigning Work
    ArrayTwo PointersBinary SearchGreedy
    Medium67% asked
  13. Buddy Strings
    Hash TableString
    Easy66% asked
  14. Design In-Memory File System
    Hash TableStringDesignTrie
    Hard66% asked
  15. Next Greater Element III
    MathTwo PointersString
    Medium65% asked
  16. Find K Closest Elements
    ArrayTwo PointersBinary SearchSliding Window
    Medium65% asked
  17. Minimum Number of Steps to Make Two Strings Anagram
    Hash TableStringCounting
    Medium65% asked
  18. Making A Large Island
    ArrayDepth-First SearchBreadth-First SearchUnion-Find
    Hard63% asked
  19. Basic Calculator III
    MathStringStackRecursion
    Hard61% asked
  20. Count Nodes With the Highest Score
    ArrayTreeDepth-First SearchBinary Tree
    Medium60% asked
  21. Count All Valid Pickup and Delivery Options
    MathDynamic ProgrammingCombinatorics
    Hard58% asked
  22. Immediate Food Delivery I
    Database
    Easy55% asked
  23. Immediate Food Delivery II
    Database
    Medium55% asked
  24. Interval List Intersections
    ArrayTwo PointersSweep Line
    Medium55% asked
  25. Mice and Cheese
    ArrayGreedySortingHeap (Priority Queue)
    Medium55% asked
  26. Subsequence With the Minimum Score
    Two PointersStringBinary Search
    Hard55% asked
  27. Find Nearest Point That Has the Same X or Y Coordinate
    Array
    Easy53% asked
  28. 01 Matrix
    ArrayDynamic ProgrammingBreadth-First SearchMatrix
    Medium52% asked
  29. Implement Trie (Prefix Tree)
    Hash TableStringDesignTrie
    Medium52% asked
  30. Vertical Order Traversal of a Binary Tree
    Hash TableTreeDepth-First SearchBreadth-First Search
    Hard52% asked
  31. Course Schedule II
    Depth-First SearchBreadth-First SearchGraph TheoryTopological Sort
    Medium51% asked
  32. Basic Calculator
    MathStringStackRecursion
    Hard49% asked
  33. Largest Rectangle in Histogram
    ArrayStackMonotonic Stack
    Hard49% asked
  34. Max Area of Island
    ArrayDepth-First SearchBreadth-First SearchUnion-Find
    Medium49% asked
  35. Minimum Size Subarray Sum
    ArrayBinary SearchSliding WindowPrefix Sum
    Medium49% asked
  36. Next Permutation
    ArrayTwo Pointers
    Medium49% asked
  37. Two Sum
    ArrayHash Table
    Easy48% asked
  38. Basic Calculator II
    MathStringStack
    Medium47% asked
  39. Longest Common Subsequence
    StringDynamic Programming
    Medium47% asked
  40. Serialize and Deserialize Binary Tree
    StringTreeDepth-First SearchBreadth-First Search
    Hard47% asked
  41. Asteroid Collision
    ArrayStackSimulation
    Medium43% asked
  42. Best Meeting Point
    ArrayMathSortingMatrix
    Hard43% asked
  43. Word Search II
    ArrayStringBacktrackingTrie
    Hard43% asked
  44. Course Schedule
    Depth-First SearchBreadth-First SearchGraph TheoryTopological Sort
    Medium39% asked
  45. Minimize Malware Spread
    ArrayHash TableDepth-First SearchBreadth-First Search
    Hard39% asked
  46. Number of Islands
    ArrayDepth-First SearchBreadth-First SearchUnion-Find
    Medium39% asked
  47. Sliding Window Maximum
    ArrayQueueSliding WindowHeap (Priority Queue)
    Hard39% asked
  48. Sliding Window Median
    ArrayHash TableSliding WindowHeap (Priority Queue)
    Hard39% asked
  49. Ways to Make a Fair Array
    ArrayPrefix Sum
    Medium39% asked
  50. Shortest Path to Get Food
    ArrayBreadth-First SearchMatrix
    Medium39% asked
  51. 4Sum
    ArrayTwo PointersSorting
    Medium34% asked
  52. Binary Tree Vertical Order Traversal
    Hash TableTreeDepth-First SearchBreadth-First Search
    Medium34% asked
  53. Count Sub Islands
    ArrayDepth-First SearchBreadth-First SearchUnion-Find
    Medium34% asked
  54. Insert Delete GetRandom O(1)
    ArrayHash TableMathDesign
    Medium34% asked
  55. Integer to Roman
    Hash TableMathString
    Medium34% asked
  56. Jump Game
    ArrayDynamic ProgrammingGreedy
    Medium34% asked
  57. LRU Cache
    Hash TableLinked ListDesignDoubly-Linked List
    Medium34% asked
  58. Merge Intervals
    ArraySorting
    Medium34% asked
  59. Merge k Sorted Lists
    Linked ListDivide and ConquerHeap (Priority Queue)Merge Sort
    Hard34% asked
  60. Similar String Groups
    ArrayHash TableStringDepth-First Search
    Hard34% asked

These are the 60 most-reported of 78 tracked DoorDash questions. Create a free account to drill the full set with solutions and an AI interviewer.

Practice questions in DoorDash's style

Original ZorixOS questions written the way DoorDash interviews, so you rehearse the real format. Not claimed as asked at DoorDash.

  1. Design an algorithm to efficiently assign the closest available DoorDash driver to a new order, considering real-time traffic, driver location, and estimated delivery time. How would you handle edge cases like driver cancellations or sudden traffic jams?

    Software EngineerAlgorithm DesignTests: Evaluates algorithmic efficiency, real-time data processing, and handling of complex edge cases.

  2. You've noticed a significant increase in delivery times for orders in a specific city. Outline your debugging process to identify the root cause. Consider potential issues with the app, driver availability, restaurant bottlenecks, or external factors.

    Software EngineerDebugging and Root Cause AnalysisTests: Assesses systematic problem-solving and ability to diagnose complex operational issues.

  3. Describe how you would design a distributed system to handle the real-time tracking of millions of DoorDash orders and drivers across multiple cities. What are the key components and potential bottlenecks?

    Software EngineerSystem DesignTests: Tests understanding of distributed systems, scalability, and fault tolerance in a high-throughput environment.

  4. Imagine DoorDash wants to introduce a feature allowing users to schedule deliveries for a future date and time. How would you architect the backend to support this? Consider database design, event scheduling, and driver dispatching.

    Software EngineerSystem DesignTests: Evaluates ability to design scalable backend systems for new product features.

  5. Write a SQL query to find the top 10 restaurants with the highest average order value in the last month, considering only orders with at least one promotional discount applied. Exclude orders with fewer than 3 items.

    Data ScientistSQL and MetricsTests: Assesses SQL proficiency and ability to derive meaningful business insights from data.

  6. DoorDash is considering a new pricing model for its subscription service, DashPass. Design an A/B test to evaluate the impact of a 10% price increase on subscriber retention and overall revenue. What metrics would you track and why?

    Data ScientistExperiment Design and MetricsTests: Tests understanding of experimental design, key performance indicators, and statistical significance.

72+ more DoorDash-style questions are in the free library, each practiceable live with adaptive follow-ups and an honest scorecard. Start free.

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DoorDash Interview Questions (2026) | ZorixOS