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Top 24
Prep plan
Updated weekly · Last refresh Aug 30

Fin Software Engineer Interview Questions

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

24questions
~4htotal time
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1
CodingStart here. 6 questions · ~54 min
Linked List ReversalEasy
Practice

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

RecursionLinked ListsArraysFin
Implement Binary SearchEasy

Tests algorithm implementation skills and correctness reasoning.

RecursionArraysSearchingFin
Explain Time ComplexityEasy

Tests ability to analyze algorithm efficiency and communicate tradeoffs.

MathArraysFin
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2
Execution7 questions · ~63 min
Design URL Shortening ServiceHard

Tests your system design skills for a high-traffic web service, including data modeling and scalability.

Trade-offsSuccess CriteriaScope ManagementFin
SQL vs NoSQL Trade-OffsMedium

Tests your database selection reasoning and understanding of consistency, scaling, and query patterns.

Trade-offsRisk AssessmentScope ManagementFin
Distributed System ConsiderationsHard

Tests your grasp of reliability, scalability, consistency, and failure modes in distributed architectures.

Trade-offsRisk AssessmentScope ManagementFin
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3
Behavioral & Leadership9 questions · ~81 min
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4
More topics2 questions · ~18 min
Real-Time Data Processing ArchitectureHard

Tests your ability to design scalable pipelines for low-latency, reliable event processing.

InfrastructureStream ProcessingQualityFin
Optimize a Slow QueryMedium

Tests your SQL performance instincts, indexing strategy, and measurement-driven optimization.

Window FunctionsJoinsAggregationsFin
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
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
Longest Consecutive Login Streak per UserHard
Practice
Practice drill

Calculate the longest consecutive login streak for each user using window functions and date manipulations.

Window FunctionsJoinsAggregationsChimeECSSalesforce
SQL for Weekly Regional PerformanceMedium
Practice
Practice drill

Calculate weekly volume, handling time, and week-over-week change by Kuiper Commercial Services region.

Window FunctionsJoinsAggregationsAmazon Kuiper Commercial Services
The finish line: interview-readyComplete all 24 questions plus 3 hands-on drills to finish this plan.