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DoorDash·Software Engineer·Technical Phone Screen·Senior

SeniorPrefer not to say
Jul 2026Remote

Summary

Analytics Engineer case interview at DoorDash focused entirely on the customer support domain. Three meaty open-ended problems back to back, all grounded in the same schema, which was a nice touch but also meant there was nowhere to hide if you didn't know the data model cold.

Questions Asked (3)

Q1

Design a fair method to allocate salary costs or performance-based compensation across support agents using completed tickets. How would you account for ticket difficulty, cases where multiple agents touched the same ticket, quality signals, and the risk of agents gaming the system?

Product Analytics & MetricsData ModelingTechnical Trade-offs
Author's notes

This is the kind of question where you can go in ten different directions and none of them feel fully right.

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AI HintsAI Generated

Suggested Approach

Start by clarifying the goal: to fairly allocate costs or compensation based on ticket contributions while incentivizing quality and efficiency. Propose a weighted attribution model that combines ticket difficulty, effort, and quality signals, with safeguards against gaming. Discuss trade-offs and iterate based on data.

Pro tip: Emphasize that any metric will be gamed, so design with transparency and regular audits, and consider using relative rankings or peer reviews to complement quantitative measures.

1. Define Objectives and Constraints

Clarify what 'fair' means: align incentives with business goals like customer satisfaction, resolution time, and cost efficiency. Identify constraints such as data availability and agent morale.

2. Design Attribution Model

Assign weights to agents based on their role (e.g., primary resolver, collaborator) and time spent. Use a points system where each ticket has a base value adjusted by difficulty and quality.

3. Incorporate Difficulty and Quality

Estimate ticket difficulty via historical data, tags, or ML models. Factor in quality signals like CSAT, reopen rates, and peer feedback to adjust points.

4. Mitigate Gaming Risks

Implement checks: cap points per ticket, require evidence for difficulty claims, rotate peer reviews, and monitor for anomalies like cherry-picking easy tickets.

5. Validate and Iterate

Simulate the model on historical data, gather agent feedback, and A/B test. Continuously refine weights and rules to balance fairness and incentive alignment.

Key Points to Mention

  • Weighted attribution based on contribution and time spent
  • Ticket difficulty scoring using historical data and ML
  • Quality metrics such as CSAT, reopen rate, and resolution time
  • Anti-gaming measures: caps, audits, and peer reviews
  • Transparency and communication with agents
  • Regular model evaluation and iteration

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

Q2

A core support KPI drops suddenly. Walk through how you'd figure out whether the cause is a tracking or instrumentation change, normal seasonality, a shift in the mix of ticket types coming in, a staffing issue, or an actual operational problem.

Root Cause AnalysisProduct Analytics & MetricsAdaptability & Ambiguity
Author's notes

Structured my answer as a layered elimination: check instrumentation first because if the logging broke everything downstream is garbage.

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AI HintsAI Generated

Suggested Approach

Start by validating the data pipeline and metric definition to rule out instrumentation issues, then systematically eliminate seasonality, mix shifts, and staffing before concluding it's an operational problem. Use a structured, hypothesis-driven approach that combines quantitative analysis with cross-functional collaboration.

Pro tip: Always check the simplest explanations first—like a broken dashboard or a recent deploy—before diving into complex analyses. Document your findings and communicate proactively to build trust and avoid panic.

1. Validate Data Integrity

Check if the KPI drop is real by verifying data sources, ETL pipelines, and metric definitions. Look for recent changes in tracking code, logging, or dashboards.

2. Rule Out Seasonality

Compare the drop to historical patterns (e.g., day-of-week, holidays, promotions) to see if it's expected. Use time-series decomposition or anomaly detection.

3. Analyze Mix Shifts

Break down the KPI by ticket type, region, or customer segment to see if a change in composition explains the drop. Check if certain categories are overrepresented.

4. Assess Staffing and Operational Factors

Review staffing levels, schedules, and recent changes (e.g., new hires, attrition). Correlate with operational metrics like response time, resolution time, and backlog.

5. Synthesize and Act

Combine findings to identify the root cause. If operational, propose fixes and monitor. If not, adjust tracking or expectations and communicate.

Key Points to Mention

  • Data validation: check for instrumentation changes, logging errors, or dashboard bugs.
  • Seasonality: use historical data and statistical methods to identify expected fluctuations.
  • Mix shift: segment the data to see if ticket type composition changed.
  • Staffing: correlate with schedules, attrition, and training issues.
  • Operational problem: look for systemic issues like system outages, policy changes, or process breakdowns.
  • Cross-functional collaboration: involve data engineers, product managers, and support leads.

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

Q3

Complaint volume is rising due to merchants preparing wrong orders, couriers picking up the wrong bag, or couriers delivering to the wrong customer. What metrics would you track, how would you pinpoint the main driver, and what interventions would you suggest to prevent these errors?

Root Cause AnalysisProduct Analytics & MetricsProduct Sense & Ideation
Author's notes

Grouped the error types by where in the fulfillment chain they happen and mapped each to the relevant foreign key in the tickets table (merchant_id vs courier_id).

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AI HintsAI Generated

Suggested Approach

Start by defining a clear North Star metric like error-related complaint rate, then break it down by error type and stage (merchant prep, courier pickup, delivery) to localize the problem. Use funnel analysis and segmentation to identify the biggest driver, then propose targeted interventions with measurable impact.

Pro tip: Frame your answer around the customer experience and business impact—show that you understand how reducing errors improves retention and lowers support costs, not just fixes a bug.

1. Define Metrics

Identify key metrics such as error-related complaint rate per order, breakdown by error type (wrong order, wrong bag, wrong delivery), and stage-specific error rates. Also track leading indicators like merchant prep accuracy and courier pickup verification rates.

2. Localize the Problem

Segment the data by merchant, courier, region, time, and order characteristics to see where errors concentrate. Use funnel analysis to pinpoint the stage with the highest drop-off or error rate.

3. Identify Root Causes

For the top error stage, dig deeper: analyze merchant training, order complexity, courier experience, app usability, and process gaps. Use qualitative data like support tickets and user feedback to complement quantitative findings.

4. Propose Interventions

Suggest targeted solutions such as improved order verification (e.g., photo confirmation), better merchant training, courier incentives for accuracy, or app features like barcode scanning. Prioritize by impact and feasibility.

5. Measure and Iterate

Define success metrics for each intervention, run A/B tests where possible, and establish a feedback loop to continuously monitor and improve error rates.

Key Points to Mention

  • North Star metric: error-related complaint rate per order
  • Segmentation by error type, merchant, courier, region, and time
  • Funnel analysis to isolate the stage with highest error rate
  • Root cause analysis using both quantitative and qualitative data
  • Interventions like photo verification, barcode scanning, and courier training
  • A/B testing and continuous monitoring to measure impact

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