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Updated weekly · Last refresh Aug 30

Waystar Software Engineer Interview Questions

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

16questions
~3htotal time
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1
SQL & Data ManipulationStart here. 3 questions + 2 drills · ~49 min
Second Highest Without AggregatesHard
Practice
Recently asked

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsWaystar
Optimizing Slow SQL QueriesMedium
Recently asked

Tests query performance troubleshooting and indexing strategy for production systems.

Performance Tuningindexesquery optimizationWaystar
Group By vs Order ByEasy
Recently asked

Tests SQL aggregation vs sorting semantics and practical query writing.

sql basicsGroup ByAggregationsWaystar
Top Customers by Sales RevenueEasy
Practice
Practice drill

Use GROUP BY and SUM to rank the top 10 customers by total revenue from a single sales table.

RankingGroup ByAggregationsHousecall ProEquifaxXYZ
Top Products by Sales RevenueEasy
Practice
Practice drill

Find the top 10 products by total sales revenue using joins, aggregation, and a CTE.

RankingGroup ByAggregationsRTXiSmile TechnologiesCatalina
2
Coding4 questions · ~39 min
First Non-Repeating ElementEasy
Practice
Recently asked

Find the first non-repeating integer in an array using frequency counting and a second scan.

Hash TablesArraysSearchingWaystar
Find Duplicates in O(n)Medium
Recently asked

Tests understanding of time complexity and duplicate detection using appropriate data structures.

Hash Tablesfrequency countArraysWaystar
Recursive File DeletionHard

Tests recursion, careful handling of filesystem traversal, and edge-case thinking in code.

Recursionfile manipulationWaystar
Normal Data Structures and AlgorithmsMedium

Evaluates problem-solving strategy and ability to select appropriate data structures.

Data StructuresAlgorithmsWaystar

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3
Behavioral & Leadership9 questions · ~88 min
Disagreeing on a Technical DirectionMedium
Recently asked

Tests conflict resolution and influence during technical disagreement, including how you challenge decisions and commit after alignment.

Influence Without AuthorityConflict ResolutionteamworkWaystar
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The finish line: interview-readyComplete all 16 questions plus 2 hands-on drills to finish this plan.