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Updated weekly · Last refresh Oct 17

NeenOpal Software Engineer Interview Questions

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

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~9htotal time
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1
SQL & Data ManipulationStart here. 4 questions · ~50 min
Running Total Sales by DateMedium
Practice

Aggregate posted Arcesium portfolio sales by date, then calculate each active portfolio's cumulative sales with a window function.

Window FunctionsRunning TotalsNeenOpal
Finding Duplicate RecordsEasy
Practice

Find duplicate customer emails using GROUP BY and HAVING in PostgreSQL.

Group ByHavingAggregationsNeenOpal
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2
Coding14 questions · ~174 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 TablesArraysStringsNeenOpal
Unique Pairs Sum to TargetEasy
Practice

Find all unique value pairs summing to a target with a hash set in expected O(n) time.

Hash TablesArraysTwo PointersNeenOpal
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3
System Design3 questions · ~37 min
Design Cold Start RecommendationsHard

Design a recommendation system strategy for new users and new items when interaction history is sparse or missing.

Cold StartFeature StoreRecommendation SystemsNeenOpal
Design a Personalized Recommendation RankerHard

Design a personalized recommendation system that turns user preferences into ranked suggestions with retrieval, ranking, and feedback loops.

RetrievalTwo-Tower ModelsRecommendation SystemsNeenOpal
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4
Pipelines4 questions · ~50 min
Design an ETL Pipeline for Large DatasetsMedium

Design an ETL pipeline to process 10TB of data daily from multiple sources into a data warehouse with strict data quality checks.

InfrastructureETLData ModelingNeenOpal
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5
Execution10 questions · ~124 min
Ensure Distributed Data ConsistencyHard

Define an execution approach for maintaining data consistency across distributed systems while balancing delivery speed, risk, and operational resilience.

InfrastructureTrade-offsRisk AssessmentNeenOpal
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6
Behavioral & Leadership7 questions · ~87 min
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