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Updated weekly · Last refresh Oct 17

Castlight Software Engineer Interview Questions

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

34questions
~5htotal time
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1
System DesignStart here. 6 questions · ~49 min
Basic Design ScenariosEasy

Assesses system design fundamentals and structured thinking.

Castlight
Online Card Game Room DesignHard

Tests system design skills for a real-time, multiplayer-style application.

Castlight
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2
Coding12 questions · ~97 min
Ball Boxes IdentificationMedium

Evaluates problem-solving with constraints and reasoning under uncertainty.

Problem SolvingCastlight
Interface vs Abstract ClassMedium

Assesses object-oriented design knowledge in Java.

javaCastlight
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3
SQL & Data Manipulation4 questions + 3 drills · ~62 min
SQL Querying and ReportingMedium

Evaluates SQL and data manipulation skills for dynamic reporting.

reportingCastlight
Unique Elements and Top-K FrequenciesMedium
Practice
Practice drill

Return the first row for each unique value, then rank the k most frequent values.

large datasetsData Structurescomplex queriesEverlaw
Java Core Concepts and SQL BasicsMedium
Practice
Practice drill

Explain core Java concepts and produce an aggregated SQL access summary using joins.

javaJoinssqlSaviynt
SQL Queries for RankingMedium
Practice
Practice drill

Rank active HSBC employees by division and return every employee tied for the highest or second-highest salary.

javasqlHsbc
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4
Behavioral & Leadership9 questions · ~73 min
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5
More topics3 questions · ~24 min
Security Patching Outside HoursMedium

Evaluates operational readiness and customer-impact awareness for security work.

incident responseCastlight
Design Patterns You PracticeMedium

Tests ability to apply proven patterns to real engineering problems.

design patternswork experienceCastlight
Identity Management and M365 BasicsEasy

Assesses baseline knowledge of identity and enterprise productivity platforms.

identity managementCastlight

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