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Cognite Backend Engineer Interview Questions

The questions to prepare for a Cognite Backend Engineer interview. Questions from real interview reports rank first. Updated daily.

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1
SQL & Data ManipulationStart here. 3 questions + 3 drills · ~54 min
Data Integrity in Migration ValidationMedium

Explain how to preserve data integrity during a large database migration using reconciliation queries, joins, CTEs, and transaction controls.

data migrationdatabasesdata integrityCognite
Implementing a Non-SQL Data StoreHard

Assesses your ability to choose and implement a non-relational datastore that fits the domain needs.

domain knowledgeCognite
Migrating Between DatabasesMedium

Evaluates your approach to safe data migration, validation, and minimizing downtime.

Cognite
SQL Rolling Average WindowEasy
Practice
Practice drill

Calculate monthly IRS return processing averages and three-month rolling averages with a window function.

Data ManipulationIRSSSkan.aiGrubMarket
7-Day Rolling Average with Window FunctionsMedium
Practice
Practice drill

Calculate daily and 7-day rolling operational downtime for the Siemens Healthineers SOMATOM CT product line.

Window FunctionsDate FunctionsRunning TotalsSiemens HealthineersCogniteRakuten Symphony
Data into SnowflakeMedium
Practice
Practice drill

Summarize Snowflake ingestion activity by source system and load method.

data migrationdata ingestiondata validationSnowflakeSnowflake Computing
2
More topics4 questions · ~32 min
Time Series DatabaseHard

Design a distributed time series database for high-volume writes, low-latency range queries, retention, and reliable failure recovery.

low latencydistributed systemsdata ingestionCognite
Real-Time Ingestion System DesignHard

Design a fault-tolerant real-time ingestion and ML processing system with low latency, scalable state, and reliable downstream outputs.

distributed systemsscalabilitydata ingestionCognite
Handling Tough Code Review FeedbackMedium

Tests how you receive peer feedback in code reviews, respond constructively, and turn critique into better code and stronger team habits.

code reviewsCommunicationfeedbackCognite
Explaining Technical Trade-offs ClearlyMedium

Tests whether you can translate complex engineering trade-offs into clear business decisions for non-technical stakeholders.

technical communicationTrade-offsStakeholder ManagementCognite

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