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DoorDash USA Software Engineer Interview Questions

The questions to prepare for a DoorDash USA Software Engineer interview. Questions from real interview reports rank first. Updated daily.

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1
CodingStart here. 15 questions · ~148 min
Maximum Depth of Binary TreeEasy
Practice

Problem Given the root of a binary tree, return its maximum depth as an integer. The maximum depth is the number of nodes along the longest path from the ...

RecursionQueueTreesDoorDash USA
Reverse a Linked ListEasy
Practice

Reverse a singly linked list in place using pointer manipulation.

RecursionLinked ListsDoorDash USA
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2
System Design14 questions · ~138 min
Design ML Microservices ArchitectureMedium

Design an ML application built with microservices for feature computation, inference, orchestration, and monitoring.

InfrastructureFeature StoreModel ServingDoorDash USA
Distributed Task SchedulerHard

Evaluates distributed systems design including coordination, retries, and scalability.

distributed systemsDoorDash USA
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3
SQL & Data Manipulation4 questions + 3 drills · ~69 min
Explain ACID in Transaction SystemsEasy

Explain the four ACID properties and why they matter for reliable transaction processing in SQL systems.

acid propertiestransactionsdata integrityDoorDash USA
Optimize High-Volume QueriesHard

Tests query optimization skills for high-throughput DoorDash USA workloads.

database optimizationDoorDash USA
Second Highest Trader SalaryEasy
Practice
Practice drill

Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.

SubqueriesRankingSortingeClinicalWorksNNeenOpal CanadaInformatica
Average Delivery Time by RegionMedium
Practice
Practice drill

Join orders and shoppers to calculate average delivery hours by region for the previous calendar month.

Date FunctionsJoinsAggregationsInstacartPeloton interactiveUber
Top Merchants and SegmentsMedium
Practice
Practice drill

Rank top DoorDash USA merchants and customer segments by completed order value using joins, aggregations, and ranking.

JoinsRankingbusiness problemDoorDash USA
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4
Execution13 questions · ~128 min
Balancing Solutions Under ConstraintsMedium

Tests tradeoff thinking and decision-making under competing constraints.

Decision MakingDoorDash USA
Reducing Long Dasher Wait TimesMedium

Assesses problem-solving for marketplace latency and operational bottlenecks.

Problem SolvingoptimizationDoorDash USA
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5
Behavioral & Leadership4 questions · ~39 min
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The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.