Notion Labs Data Engineer Interview Questions

The questions to prepare for a Notion Labs Data Engineer interview. Questions from real interview reports rank first. Updated daily.

17questions

~3htotal time

Track your progressSign up free to work through all 17 questions and resume where you left off.

Start practicing free →

SQL & Data ManipulationStart here. 4 questions · ~45 min

Optimize Slow SQL QueriesMedium

Practice

Demonstrate a PostgreSQL approach for optimizing a filtered aggregation query over related tables.

Subqueriesdatabase optimizationJoins

Notion Labs

SQL vs NoSQL for Go-to-Market DataEasy

Explain how SQL and NoSQL differ in schema, consistency, scaling, and Demandbase-style analytics use cases.

JoinsData Wrangling

Notion Labs

Monthly User Aggregation QueryMedium

Practice

Aggregate matching Notion user events by month, including active users, total events, and average events per active user.

Date FunctionsGroup ByAggregations

Notion Labs

More SQL & Data Manipulation questions with a free account

Pipelines6 questions · ~67 min

Backfill While Preserving Real TimeHard

Approach for running large historical backfills without breaking real-time pipeline freshness or correctness.

Stream ProcessingDependenciesBackfilling

Notion Labs

Real-Time Dashboard Pipeline DesignHard

Approach for building near-real-time dashboard pipelines with streaming, orchestration, and data quality controls.

Stream ProcessingSchedulingDependencies

Notion Labs

Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQuality

Notion Labs

More Pipelines 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

Coding4 questions · ~45 min

SQL and Python Coding SkillsMedium

Tests your practical SQL and Python data manipulation skills and code structuring ability.

sqlpython

Notion Labs

Deduplicate and Merge RecordsMedium

Tests record linkage, deduplication logic, and conflict resolution across multiple data sources.

Hash TablesArraysStrings

Notion Labs

More Coding questions with a free account

Behavioral & Leadership3 questions · ~34 min

More Behavioral & Leadership questions with a free account

The finish line: interview-readyComplete all 17 questions to finish this plan.