Dataford
Top 50
Company roadmap
Updated weekly · Last refresh Aug 30

Inc. In Interview Questions

The questions to prepare for Inc. In interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

50questions
~9htotal time
Track your progressSign up free to work through all 50 questions and resume where you left off.
Start practicing free →
1
SQL & Data ManipulationStart here. 5 questions · ~52 min
7-Day Rolling Active UsersMedium
Practice

Compute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.

Window FunctionsDate FunctionsRunning TotalsInc. In
More SQL & Data Manipulation questions with a free account
2
Coding5 questions · ~52 min
LRU Cache for Fast RetrievalMedium
Practice

Implement an LRU cache using a hash map and doubly linked list to support O(1) get and put operations.

Hash TablesSearchingSortingInc. In
More Coding questions with a free account

Sign up to see every question

Create a free account to unlock this list and practice real interview questions.

Get my prep plan
3
Pipelines5 questions · ~52 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityInc. In
More Pipelines questions with a free account
4
Metrics4 questions · ~42 min
Critical Metrics for Product LaunchMedium

Choose the most important launch metrics, balancing early signals, long-term outcomes, and a clear KPI hierarchy.

KPIsConversion RateLeading IndicatorsInc. In
More Metrics questions with a free account
5
Product Sense4 questions · ~42 min
Define Metrics for New FeaturesMedium

Define a success metric for a new feature that captures real user value, not just raw usage.

MetricsFeature Prioritizationuser valueInc. In
More Product Sense questions with a free account
6
A/B Testing & Experimentation4 questions · ~42 min
Landing Page Conversion Test DesignMedium

Design a landing-page A/B test with clear metrics, power, and significance criteria while guarding against common experiment pitfalls.

Statistical SignificanceSample SizeA/B TestingInc. In
More A/B Testing & Experimentation questions with a free account
7
More topics23 questions · ~240 min
Extreme Imbalance in Fraud DetectionMedium

Handle rare positive labels in ad fraud detection with the right sampling, loss design, validation, and thresholding strategy.

Feature Engineeringmodel trainingClass ImbalanceInc. In
Balance Debt and Feature DeliveryMedium

Explain how you prioritize technical debt versus feature work while aligning stakeholders and protecting delivery speed.

Trade-offsScope ManagementPrioritizationInc. In
More questions with a free account
The finish line: interview-readyComplete all 50 questions to finish this plan.