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Prep plan
Updated weekly · Last refresh Aug 30

Tendo Data Engineer Interview Questions

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

26questions
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1
CodingStart here. 3 questions · ~26 min
Merge Two Sorted Linked ListsEasy
Practice

Merge two sorted singly linked lists into one sorted list by relinking existing nodes.

RecursionLinked ListsSortingTendo
Explain Time ComplexityEasy

Tests ability to analyze algorithm efficiency and communicate tradeoffs.

MathArraysTendo
Deduplicating Large DatasetsMedium

Tests your ability to design scalable deduplication for large data volumes.

Hash TablesArraysSortingTendo
2
Pipelines19 questions · ~166 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityTendo
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 pipelinedesigningestionTendo
Data Integration Tools ExperienceEasy

Discuss the data integration tools you have used and how they fit into ETL, orchestration, and data quality workflows.

InfrastructureToolsETLTendo
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3
SQL & Data Manipulation4 questions + 3 drills · ~65 min
OLTP vs OLAP Database DesignMedium

Explain OLTP vs OLAP designs, including schema shape, workload patterns, and when each is appropriate in a data platform.

financial dataperformanceData ModelingTendo
Cleaning Data for AnalysisEasy

Tests your data preparation workflow, quality checks, and practical handling of messy inputs.

Data WranglingCase WhenAggregationsTendo
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
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The finish line: interview-readyComplete all 26 questions plus 3 hands-on drills to finish this plan.