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Updated weekly · Last refresh Oct 17

Hearts & Science Software Engineer Interview Questions

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

42questions
~6htotal time
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1
CodingStart here. 8 questions · ~71 min
Linked List ReversalEasy
Practice

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

RecursionLinked ListsArraysHearts & Science
Language Proficiency and Applied ImpactEasy

Explain which programming languages you know best, why, and how you used them to deliver maintainable and performant software.

Hash TablesStringsSortingHearts & Science
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2
Execution21 questions · ~187 min
Collaborate Across Product and Data ScienceMedium

Explain how you collaborate with product managers and data scientists to align goals, manage trade-offs, and deliver AI work effectively.

CommunicationteamworkHearts & Science
Adapt Communication With Difficult ColleagueMedium

Describe how you changed your communication style to work productively with a difficult colleague while keeping delivery on track.

Trade-offsRisk AssessmentHearts & Science
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3
Pipelines11 questions · ~98 min
Backfilling Missing Pipeline DataMedium

Approach for safely backfilling missing data while preserving correctness, idempotency, and data quality.

ETLQualityHearts & Science
Batch vs Stream Processing Trade-offsMedium

Compare batch and stream processing across latency, complexity, cost, and data quality in a modern analytics pipeline.

InfrastructureStream ProcessingETLHearts & Science
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4
More topics2 questions · ~18 min
SQL vs NoSQL Trade-offsEasy

Explain SQL vs NoSQL trade-offs, including schema design, consistency, scaling, and query flexibility.

JoinsData WranglingAggregationsHearts & Science
Optimizing SQL Query PerformanceMedium

Tests your SQL tuning skills and ability to improve query efficiency and resource usage.

JoinsData WranglingAggregationsHearts & Science
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Top Customers by Purchase VolumeMedium
Practice
Practice drill

Rank Amazon DSP customers by completed purchase quantity using joins, aggregation, a CTE, and deterministic ordering.

RankingGroup ByAggregationsAmazon DSPHearts & Science
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
Contact Center Agent Performance MetricsHard
Practice
Practice drill

Compute daily agent call KPIs and SLA using joins, aggregations, and window ranking in a contact center model.

ETLAggregationsData ModelingADP
The finish line: interview-readyComplete all 42 questions plus 3 hands-on drills to finish this plan.