Technocolabs Data Engineer Interview Questions

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

24questions

~3htotal time

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PipelinesStart here. 19 questions · ~163 min

Explain what a data warehouse is and why it matters in analytics pipelines.

Handling a Production Pipeline FailureEasy

Describe a real production pipeline failure, how you diagnosed and fixed it, and what changes you made around orchestration, quality, and reruns.

InfrastructureIdempotencyQuality

Technocolabs

Structured vs Unstructured DataEasy

Explain how structured and unstructured data differ, and why that matters for pipeline design and downstream processing.

ETLData ModelingQuality

Technocolabs

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SQL & Data Manipulation3 questions + 2 drills · ~46 min

Tests understanding of SQL join semantics and correct selection for data integration tasks.

Optimize SQL Query PerformanceHard

Practice

Optimize a PostgreSQL reporting query by reducing intermediate rows, using appropriate joins, and calculating monthly performance efficiently.

database optimizationdatabase managementindexes

Technocolabs

Core SQL ConceptsEasy

Tests baseline SQL knowledge needed to build and maintain data systems.

Window FunctionsJoinsAggregations

Technocolabs

Compute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.

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

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