Dataford
Dataford
Top 9
Prep plan
Updated weekly · Last refresh Oct 17
Z

Zelis Data Engineer Interview Questions

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

9questions
~1htotal time
Track your progressSign up free to work through all 9 questions and resume where you left off.
Start practicing free →
1
PipelinesStart here. 3 questions · ~24 min
Debugging Distributed Pipeline BottlenecksHard

Identify and resolve performance bottlenecks across ingestion, distributed processing, storage, and orchestration layers.

data pipelinedistributed computingbottleneck optimizationZZelis
Data Quality and Schema EvolutionMedium

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

schema evolutionData ModelingQualityZZelis
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityZZelis
2
Behavioral & Leadership4 questions · ~32 min
Pivoting Under ConstraintsMedium

Tests adaptability, prioritization, and ownership when a project encounters unexpected obstacles.

project experienceadaptabilityaccountabilityZZelis
Address System Design FlawHard

Tests ownership, technical judgment, and influence when identifying and remediating a system design flaw.

system designProblem SolvingaccountabilityZZelis
Prioritizing Competing Data RequestsMedium

Tests prioritization under pressure in a data engineering context, including stakeholder management, trade-off decisions, and ownership of outcomes.

Decision MakingStakeholder ManagementPrioritizationZZelis
More Behavioral & Leadership questions with a free account
3
More topics2 questions · ~16 min
Database Trade-Offs for Use CaseHard

Compare database technologies for an ML-backed backend by access pattern, consistency, scale, latency, cost, and operational risk.

Trade-offsdatabase accesssystem architectureZZelis
Star vs Snowflake for Sales AnalyticsMedium

Compare star and snowflake schemas for warehouse design, including trade-offs in normalization, query simplicity, and analytics performance.

JoinsData WranglingGroup ByZZelis

Sign up to see every question

Create a free account to unlock this list and practice real interview questions.

Get my prep plan
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
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
Resolve Conflicting Customer AttributesMedium
Practice
Practice drill

Use joins, CTEs, and row ranking to resolve conflicting customer profile values across ACME House systems.

JoinsData WranglingQualityRamsey SolutionsACME House
Reconcile Conflicting Invoice TotalsMedium
Practice
Practice drill

Reconcile billing and ERP invoice totals using joins, a CTE for latest snapshots, and CASE-based discrepancy classification.

JoinsData WranglingQualityLiterati
The finish line: interview-readyComplete all 9 questions plus 3 hands-on drills to finish this plan.