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Updated weekly · Last refresh Oct 17

Marsh & Mclennan Software Engineer Interview Questions

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

44questions
~7htotal time
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1
CodingStart here. 7 questions · ~65 min
Two Sum with TargetEasy
Practice

Use a hash map to find two array elements that sum to a target in O(n) time.

Hash TablesArraysStringsMarsh & Mclennan
Palindrome Check with CleanupEasy
Practice

Use two pointers to determine whether a string is a palindrome after ignoring non-alphanumeric characters.

Hash TablesStringsTwo PointersMarsh & Mclennan
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2
Execution4 questions · ~37 min
Plan HA and DR StrategyMedium

Define how you would deliver high availability and disaster recovery for a cloud-hosted application with clear recovery targets and rollout safeguards.

cloud serviceshigh availabilitydisaster recoveryMarsh & Mclennan
Migrate Monolith to MicroservicesHard

Plan a zero-downtime migration from a legacy monolith to microservices while managing risk, sequencing, and stakeholder pressure.

Trade-offsRoadmappingRisk AssessmentMarsh & Mclennan
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3
System Design4 questions · ~37 min
System Design ScenarioHard

Evaluates your end-to-end system design thinking, tradeoffs, and scalability.

system designMarsh & Mclennan
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4
Behavioral & Leadership24 questions · ~222 min
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5
More topics5 questions · ~46 min
Linux, Docker, and Architecture BasicsMedium

Evaluates foundational infrastructure understanding relevant to production systems.

dockerarchitecturelinuxMarsh & Mclennan
SQL Joins and Window QueriesHard

Tests ability to write advanced SQL for extracting transactional data accurately.

Window FunctionsJoinstransactional dataMarsh & Mclennan
Batch Financial Transactions PipelineHard

Tests system design for reliable, scalable batch processing of financial transactions.

financial dataBatch ProcessingQualityMarsh & Mclennan
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Workday Integration ExperienceHard
Practice
Practice drill

Audit latest Workday EIB and custom integration records for failures, security issues, transformation mismatches, and missing feeds.

Joinstechnical skillsCTEsMarsh & Mclennan
Scenario-Based Business CaseHard
Practice
Practice drill

Aggregate project outcomes and present a defensible SQL-based business case analysis.

project experienceJoinsbusiness problemTikTok
SQL Proficiency LevelMedium
Practice
Practice drill

Demonstrate SQL proficiency by summarizing completed work orders and assigning a performance band for each technician.

Joinstechnical skillsCase WhenFaireSST Engineering Aerospace
The finish line: interview-readyComplete all 44 questions plus 3 hands-on drills to finish this plan.