Wissen Technology Data Engineer Interview Questions

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

Approach for maintaining high quality data across ML pipelines, from validation and reproducibility to monitoring and recovery.

Data Quality and Schema Evolution

Medium

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

schema evolutionData ModelingQuality

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Retry Failed Airflow DAG Tasks

Medium

Implement task retries in Airflow with backoff, idempotent task design, and monitoring for repeated failures.

dagretry mechanismairflow

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Evaluates data modeling decisions that reduce cost and improve query performance.

Optimize BigQuery Joins

Hard

Tests ability to improve query performance through join strategy and BigQuery-specific tuning.

sqloptimization

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SQL Performance: NOT IN vs NOT EXISTS

Medium

Tests SQL query optimization knowledge and ability to reason about execution behavior.

performancequery optimizationsql

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Solve a Coding Problem

Medium

Tests ability to complete and debug provided code in a data engineering context.

coding challengeProblem Solving

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Automate REST API Ingestion

Medium

Tests practical coding ability to build ingestion automation for data engineering workflows.

apidata ingestion

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