Dataford
Top 17
Prep plan
Updated weekly · Last refresh Aug 30

Aon Software Engineer Interview Questions

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

17questions
~3htotal time
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1
CodingStart here. 3 questions · ~27 min
Linked List ReversalEasy
Practice

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

RecursionLinked ListsArraysAon
Implement Binary SearchEasy

Tests algorithm implementation skills and correctness reasoning.

RecursionArraysSearchingAon
Programming Languages and FitEasy

Tests technical depth and ability to justify tool choices based on outcomes.

Hash TablesArraysStringsAon
2
Execution5 questions · ~46 min
Choosing Monolith vs MicroservicesMedium

Explain how you would decide between a monolith and microservices for a new engineering initiative.

Trade-offsRisk AssessmentScope ManagementAon
Debugging a Production IssueMedium

Tests your incident triage process, hypothesis-driven debugging, and communication during outages.

Rollback PlanTrade-offsRisk AssessmentAon
Software Development LifecycleEasy

Tests understanding of end-to-end delivery practices from requirements through deployment and maintenance.

Success CriteriaRoadmappingScope ManagementAon
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3
Behavioral & Leadership7 questions · ~64 min
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4
More topics2 questions · ~18 min
Deriving Insights From DataMedium

Tests your data analysis approach, feature thinking, and how you turn results into decisions.

JoinsData WranglingAggregationsAon
Real-Time Data Processing DesignHard

Tests your understanding of streaming architectures, latency tradeoffs, and reliable end-to-end data flow.

InfrastructureStream ProcessingSchedulingAon
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
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
Monthly Campaign Performance SummaryEasy
Practice
Practice drill

Aggregate January 2024 campaign data by channel using GROUP BY, filtering, and ordering by total clicks.

JoinsData WranglingAggregationsDNVEversanaDiscord
The finish line: interview-readyComplete all 17 questions plus 3 hands-on drills to finish this plan.