DoorDash Interview Questions
Practice 256 real DoorDash interview questions for 2026. DoorDash interview questions in this collection focus on hands-on coding and system thinking first — Coding & Algorithms and System Design are front and center — followed by Analytics & Experimentation, Data Manipulation (SQL/Python), and Behavioral & Leadership. Use this for interview preparation with detailed solutions that match the company’s expectations for Software Engineer, Data Scientist, Machine Learning Engineer, Analytics Engineer, and Product Analyst roles. Expect interviews that reward clear APIs, testable OOP, marketplace reasoning, and experiment-driven thinking. DoorDash’s loop is short and practical: a recruiter screen, one or more CodeCraft coding rounds (DoorDash’s signature practical coding session), a system-design interview, and a values-driven behavioral/hiring-manager round, typically completed in about 2–5 weeks. SWE CodeCraft prompts mirror real tasks you’ll see on the job — driver-pay calculations, double-pay windows, courier earnings aggregation, shopping-cart validation, low-latency pay or routing services and SLA/storage tradeoffs — while Data Scientist questions center on experiments, LA order-drop investigations, recommender design and “should we add bicycle dashers” analyses. ML roles focus on recommendation serving and ML infra; Analytics Engineers emphasize ETL, DAU and allocation diagnostics. The newer AI CodeCraft challenge allows AI coding tools but evaluates your judgment, not just the final output.
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Count changed nodes between two menu trees
This question evaluates algorithmic problem-solving with tree data structures, testing competencies in hierarchical diffing, node matching by sibling ...
Maximize Chef Assignment Profit
You are given three integer arrays: - chefSkill[i]: the skill level of the i-th chef. - dishDifficulty[j]: the difficulty level required to cook the j...
Investigate Causes of Cold Meal Deliveries
Investigate and Reduce Cold Food Deliveries A delivery service is receiving customer complaints that meals arrive cold. You need to investigate the ro...
Design an experiment for thermal bags
Experiment Design: Thermal Bags for Couriers to Reduce Cold-Food Refunds Background We want to evaluate whether providing couriers with thermal bags r...
Explain interest and influence stakeholders
Behavioral & Leadership (STAR) — Data Scientist, Marketplace Context You are interviewing onsite for a Data Scientist role focused on a multi‑sided ma...
Build a late-delivery risk model
Predict Late Delivery Risk at Order Creation Context You are given an anonymized dataset of marketplace orders with timestamps, store/customer/market ...
Minimize batches and allocate riders by time
This question set evaluates algorithmic problem-solving in scheduling and resource allocation, assessing understanding of batching under capacity and ...
Solve tree distance and design file system
Solve tree distance and design file system Given a binary tree, find the maximum distance between two 'alive' nodes, where 'alive' nodes are initially...
Design Experiments to Measure Promotion Scheduling Impact
Design Experiments to Measure Promotion Scheduling Impact Scenario A food delivery marketplace is releasing flexible promotion scheduling (e.g., time-...
Investigate Causes of Increased Driver Wait Time
Investigate Causes of Increased Driver Wait Time Scenario DoorDash observed that driver (Dasher) wait time at restaurants spiked last week versus the ...
Measure Impact of Merchant Variety on Consumer Experience
Measure Impact of Merchant Variety on Consumer Experience Scenario DoorDash's product team is exploring how merchant variety/selection affects consume...
Identify Key Drivers of Delivery Decline in Los Angeles
Identify Key Drivers of Delivery Decline in Los Angeles Scenario DoorDash sees a 10% drop in the number of completed deliveries in Los Angeles week-ov...
Diagnose rising cold-food complaints and choose metrics
This question evaluates a data scientist's diagnostic analytics skills, including hypothesis generation, causal inference, metric engineering, and A/B...
Compute Courier Delivery Pay
This question evaluates a candidate's ability to work with time-interval arithmetic, interval union/overlap reasoning, and aggregation of time-based p...
Implement a hierarchical key-value store
Implement a hierarchical key-value store Implement an in-memory hierarchical key-value store where keys are UNIX-like paths joined by '/'. The root no...
Handle a payment-service incident with resource spikes
Handle a payment-service incident with resource spikes Incident Response and Resilience: Payment Integration Service Outage Context You own an interna...
Demonstrate leadership and team development
Demonstrate leadership and team development Behavioral & Leadership: End-to-End Project Leadership (L5-level) Context: This is a behavioral prompt oft...
Design A/B Test to Evaluate Algorithm's Revenue Impact
A/B Test a Recommendation Algorithm's Revenue Impact You are evaluating a new recommendation algorithm in a consumer marketplace app. The goal is to m...
Design cron scheduler and reward/review system
System Design: Company-Wide Scheduler Platform and Employee Review & Rewards System You are designing two platforms for a fast-growing, multi-tenant t...
Describe your most impactful recent project
Question Walk me through your most impactful (or proudest) recent project. Be ready to go deep on the technical details and the decisions you made. 1....