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Updated weekly · Last refresh Oct 17

Waystar Software Engineer Interview Questions

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

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1
CodingStart here. 6 questions · ~74 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
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
Palindrome Check Ignoring FormattingEasy
Practice
Recently asked

Determine whether a string is a palindrome after ignoring spaces and capitalization.

coding challengeBasic AlgorithmsStringsWaystar
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2
SQL & Data Manipulation4 questions + 1 drill · ~60 min
Second Highest Without AggregatesHard
Practice
Recently asked

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

SubqueriesRankingSelf-JoinsWaystar
Inner Join Orders and CustomersEasy
Practice
Recently asked

Use an INNER JOIN to return each order with the name of its matching customer.

data relationshipssql basicsJoinsWaystar
Optimizing Slow SQL QueriesMedium
Recently asked

Tests query performance troubleshooting and indexing strategy for production systems.

Performance Tuningindexesquery optimizationWaystar
SQL Query for Data ExtractionEasy
Practice
Practice drill

Extract qualifying market observations by venue and price, then return them in chronological order.

JoinsData ManipulationGroup ByEquifaxDPR ConstructionRigUp
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3
Behavioral & Leadership7 questions · ~87 min
Introducing Yourself Through a ProjectEasy
Recently asked

Tests concise self-introduction, clear project storytelling, and the ability to explain personal impact in a data science context.

CommunicationOwnershipWaystar
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The finish line: interview-readyComplete all 17 questions plus 1 hands-on drill to finish this plan.