Deutsche Telekom Data Engineer Interview Questions
The questions to prepare for a Deutsche Telekom Data Engineer interview. Questions from real interview reports rank first. Updated weekly.
Explain INNER, LEFT, RIGHT, FULL OUTER, CROSS, and SELF JOINs with examples and when to use each.
Evaluates SQL proficiency for analytics transformations and data quality tasks in Hive.
Tests practical PySpark and SQL usage within real project work.
Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.
eClinicalWorks
Informatica
Spectraforce TechnologiesUse joins, conditional aggregation, and ROW_NUMBER to find the three highest-churn Deutsche Telekom products in each region.
Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.
Total Wine & More
Inc.
Benjamin MooreApproach for maintaining data quality and integrity across ETL pipelines.
A structured approach to debugging production data pipelines, with focus on orchestration, data quality, idempotency, and safe backfills.
Approach for detecting and mitigating skew in PySpark pipelines using partitioning, join strategies, and runtime monitoring.
Tests adaptability under changing requirements, including reprioritization, ownership, and execution in ambiguity.
Normalize missing fields and detect duplicate records by composite keys using a hash map.
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