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Zelis Healthcare Software Engineer Interview Questions

The questions to prepare for a Zelis Healthcare Software Engineer interview. Questions from real interview reports rank first. Updated weekly.

34questions
~5htotal time
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1
SQL & Data ManipulationStart here. 4 questions + 3 drills · ~62 min
Clustered vs Non-Clustered IndexesMedium

Explain how clustered and non-clustered indexes differ in storage, lookup behavior, and query performance.

JoinsData WranglingZelis Healthcare
Design Multi-Tenant SchemaHard

Tests ability to model multi-tenancy safely and efficiently in relational schemas.

schema designData ModelingZelis Healthcare
Data Integrity in Distributed SystemsHard

Tests distributed data consistency thinking and practical integrity safeguards.

acid propertiestransactionsdata integrityZelis Healthcare
Optimize Slow Multi-Table SQLHard

Tests SQL performance tuning skills for large-scale healthcare claim datasets.

Performance TuningJoinsperformanceZelis Healthcare
SQL Joins for TransactionsMedium
Practice
Practice drill

Combine customer transactions and optional notes using INNER JOIN, LEFT JOIN, aggregation, and conditional spend bands.

JoinsData WranglingtransactionsSupernova TechnologyDeloitte
Analyzing Operations Bottlenecks with SQLHard
Practice
Practice drill

Use multi-level CTEs, joins, and LAG to identify Samsung regional inventory shortages and late deliveries.

JoinsperformanceAggregationsSamsung ElectronicsApeel Sciences
Top Customers by Net SalesMedium
Practice
Practice drill

Compute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.

SubqueriesJoinsData WranglingGain DigitalTCSZest AI
2
Coding5 questions · ~40 min
Unit Testing and AlgorithmsHard

Evaluates test strategy and algorithmic problem-solving skills.

Data StructuresAlgorithmsZelis Healthcare
C# and Web API BasicsMedium

Assesses core .NET web development skills relevant to Zelis Healthcare platform integrations.

sqlZelis Healthcare
OOP Concepts in C#Medium

Evaluates your ability to apply OOP principles when designing maintainable .NET services.

oopZelis Healthcare
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3
Behavioral & Leadership25 questions · ~200 min
Resolving a Difficult StakeholderMedium

Tests how you handle a difficult stakeholder through direct communication, influence, and ownership while preserving the relationship.

Conflict ResolutionStakeholder ManagementCommunicationZelis Healthcare
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The finish line: interview-readyComplete all 34 questions plus 3 hands-on drills to finish this plan.