DoorDash Software Engineer Onsite Coding Questions

Say if DoorDash along with other partners across US is sponsoring for 3-day charity event where huge partipation of more than 3 million customers are expected to participare and simply...

I went to the nearest DashMart for the coding interview. I was interviewed by a middle-aged white man with a strong classmate vibe; there wasn't much interaction during the interview. SD asked us to d

There were four rounds in total. Coding - Codecraft The Dasher payment question used a scanline approach. Everything had to be written from the class definition onwards. Using Java meant I was incredi

Round 1: System Design + Domain Knowledge The problem focused on designing an Ads Click Aggregator. The session was conducted by a Data Engineer and proved difficult due to the interviewer’s appar

**Problem Statement** You are given a city represented as a 2D grid containing the following cell types: * `' '`: Open road. Travel is allowed in four directions (up, down, left, right). * `'X'`: Bloc

**Context and Format** The interview consisted of a collaborative, practical coding exercise rather than a standard algorithmic problem. The scenario involved migrating from a monolith to a microservi

Overview * 5 minute intro * 50 minutes on debugging exercise * 5 minutes for Q/A ## Debugging Dasher Assignment Service You have a single `main.py` file (or equivalent in your chosen programming lan

This round was a pretty fun round and you do need to come with a local editor with an AI setup. A ChatGPT tab is not enough. You need to use stuff like VSCode with Copilot, Cursor, claude code, etc. I

HM BQ: The hiring manager was very nice and kept asking follow-up questions about the impact. Branding Round: I worked on a file system and had to implement a Trie tree. I talked a bit about OOP funda

First question: LeetCode 200. Number of Islands (https://leetcode.com/problems/number-of-islands/) * Follow-up: LeetCode 695. Max Area of Island (https://leetcode.com/problems/max-area-of-island/)

Same question as this post: https://leetcode.com/discuss/interview-question/1544410/Doordash-TPS-Senior-Software-Engineer At DoorDash, many deliveries are scheduled well in advance. To improve our assignment rate, we want to enable dashers to claim these scheduled deliveries early....

From an onsite Given a binary tree, find the maximum path sum from any two "alive nodes" within the tree. We can assume a node is an alive node if and...

I heard that you should practice from this pool koko-eating-bananas subarray-sum-equals-k swim-in-rising-water asteroid-collision longest-common-subsequence operations-on-tree my-calendar-ii car-pooling minimum-size-subarray-sum k-diff-pairs-in-an-array next-greater-element-iii basic-calculator serialize-and-deserialize-binary-tree decode-ways unique-paths-ii I gotserialize and deserialize a binary tree and a question about restaurant names, which was just about anagrams and swapping letters in...

Doordash virtual onsite question: Given a set list of pickups and deliveries for order, figure out if the given list is valid or not. A delivery cannot happen for an order before...

DoorDash virtual onsite question: Asked this: https://leetcode.com/discuss/interview-question/846916/Validate-Orders-Path-(Doordash) Follow up: Find longest valid subarray Ex 1: orders = [\'P1\', \'P1\', \'D1\'], return [\'P1\', \'D1\'] Ex 2: orders = [\'P1\', \'P1\', \'D1\', \'D1\'], return [\'P1\',...

Implement (code) a Key value store with transactions. Write a Fully funcitonal code in 25-30 min in interview with test cases Set Get Delete are methods in Key value store for transactions Begin Commit Rollback Ideas are welcome,

LeetCode #286: Walls and Gates. Difficulty: Medium. Topics: Array, Breadth-First Search, Matrix. Asked at DoorDash in the last 6 months.

LeetCode #1235: Maximum Profit in Job Scheduling. Difficulty: Hard. Topics: Array, Binary Search, Dynamic Programming, Sorting. Asked at DoorDash in the last 6 months.

LeetCode #1268: Search Suggestions System. Difficulty: Medium. Topics: Array, String, Binary Search, Trie, Sorting, Heap (Priority Queue). Asked at DoorDash in the last 6 months.

LeetCode #456: 132 Pattern. Difficulty: Medium. Topics: Array, Binary Search, Stack, Monotonic Stack, Ordered Set. Asked at DoorDash in the last 6 months.