Top 15
Prep plan
Updated weekly · Last refresh Aug 30

Convex Data Engineer Interview Questions

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

15questions
~2htotal time
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1
PipelinesStart here. 9 questions · ~82 min
Data Quality and Schema EvolutionMedium

Approach for handling schema changes and data quality checks in a high-volume data lake pipeline.

schema evolutionData ModelingQualityConvex
Real-Time Dashboard Pipeline DesignHard

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

Stream ProcessingSchedulingDependenciesConvex
Design an End-to-End Data PipelineMedium

Approach for designing an end-to-end data pipeline from ingestion through transformation, storage, and downstream consumption.

data pipelinedesigningestionConvex
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2
SQL & Data Manipulation3 questions + 3 drills · ~57 min
Optimize a Slow SQL QueryHard

Tests advanced SQL tuning and ability to improve performance while preserving results.

SubqueriesJoinsCTEsConvex
Handling Missing ValuesEasy

Tests data quality handling and decision-making for downstream reliability.

Data WranglingCase WhenAggregationsConvex
SQL vs NoSQL DatabasesEasy

Tests your foundational understanding of database models and when to use each.

JoinsData WranglingCTEsConvex
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
Contact Center Agent Performance MetricsHard
Practice
Practice drill

Compute daily agent call KPIs and SLA using joins, aggregations, and window ranking in a contact center model.

ETLAggregationsData ModelingADP
Handle Missing Financial Input ValuesMedium
Practice
Practice drill

Use joins, CTEs, and CASE logic to flag and fill missing financial fields for Qlik planning records.

Data WranglingETLQualityQlik
3
More topics3 questions · ~27 min
Flatten Nested Lists in PythonEasy
Practice

Flatten arbitrarily nested lists while preserving order using depth-first traversal.

RecursionStackArraysConvex
Implementing Data DeduplicationMedium

Tests algorithmic thinking and practical approaches to entity resolution and data quality.

Hash TablesArraysSortingConvex
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