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KLAS Research Software Engineer Interview Questions

The questions to prepare for a KLAS Research Software Engineer interview. Questions from real interview reports rank first. Updated daily.

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~3htotal time
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1
CodingStart here. 7 questions · ~70 min
Two Sum ProblemEasy
Practice

Find two indices in an array whose values add up to a target using a hash map.

Hash TablesArraysTwo PointersKLAS Research
Linked List ReversalEasy
Practice

Reverse a singly linked list in-place using iterative pointer manipulation.

RecursionLinked ListsArraysKLAS Research
Compare REST and SOAP APIsMedium

Explain the core differences between REST and SOAP, including message format, protocol style, and trade-offs.

Hash TablesStringsKLAS Research
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2
Execution3 questions · ~30 min
Quality Under Tight DeadlineMedium

Explain how you protect quality on a fixed-deadline engineering project by managing scope, risks, and release criteria.

Launch PlanningTrade-offsScope ManagementKLAS Research
Secure Patient Data TrackingHard

Tests secure system design for healthcare data, including privacy, access control, and threat mitigation.

Trade-offsSuccess CriteriaRisk AssessmentKLAS Research
Choosing Application ArchitectureHard

Tests architecture decision-making, tradeoffs, and alignment to healthcare-focused product requirements.

Trade-offsRoadmappingScope ManagementKLAS Research

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3
Behavioral & Leadership8 questions · ~80 min
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4
More topics2 questions · ~20 min
Database NormalizationMedium

Assesses your understanding of database normalization concepts and when to apply them.

sqlKLAS Research
Optimizing Slow SQL QueriesMedium

Tests SQL performance tuning skills and ability to diagnose bottlenecks in real queries.

SubqueriesJoinsAggregationsKLAS Research
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
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
Compute Category Sales by LocationMedium
Practice
Practice drill

Calculate sales value by item category and location using pricing validity and a specified date range.

Date FunctionsJoinssqlAAmazon Kuiper Manufacturing EnterprisesAmazon DSPAmazon Advertising
SQL Max Salary Per DepartmentEasy
Practice
Practice drill

Find every employee tied for the highest salary in each department using RANK and a department join.

JoinssqlAggregationsOpenTexteClinicalWorks
The finish line: interview-readyComplete all 20 questions plus 3 hands-on drills to finish this plan.