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Updated weekly · Last refresh Aug 30

Cowen Software Engineer Interview Questions

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

18questions
~2htotal time
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1
CodingStart here. 5 questions · ~40 min
Programming Languages and RationaleEasy

Tests your technical fit and your ability to justify language choices based on constraints.

MathArraysStringsCowen
Optimizing an Existing AlgorithmHard

Tests algorithmic thinking, profiling, complexity analysis, and practical performance improvements.

Dynamic ProgrammingSearchingGreedyCowen
Ensuring Code Quality and PerformanceMedium

Tests your engineering practices for reliability, testing, and performance.

ArraysSearchingSortingCowen
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2
Behavioral & Leadership9 questions · ~72 min
Prioritizing Conflicting High-Stakes WorkEasy

Tests prioritization under pressure, stakeholder management, and ownership when multiple urgent requests compete for limited time.

Stakeholder ManagementOwnershipDealing With AmbiguityCowen
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3
More topics4 questions · ~32 min
Your Strengths and WeaknessesEasy

Tests self-awareness and how you position yourself for success in an Account Executive role at Aqr.

Trade-offsSuccess CriteriaRisk AssessmentCowen
Designing for High-Frequency TradingHard

Tests system design skills for low latency, throughput, and correctness in trading workflows.

Feature StoreModel ServingRecommendation SystemsCowen
SQL vs NoSQL DifferencesEasy

Tests understanding of database tradeoffs and when to choose each approach.

SubqueriesJoinsData WranglingCowen
Approach to a Financial ProblemMedium

Tests structured problem solving and domain-aware execution for Cowen’s financial systems.

Trade-offsRoadmappingRisk AssessmentCowen

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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
SQL Expected vs Actual ComparisonHard
Practice
Practice drill

Compare expected and actual 6sense QA results using a FULL OUTER JOIN, aggregation, NULL-safe comparisons, and CASE status logic.

SubqueriesJoinsData Wrangling6senseApex Systems
Unify CRM and Google Analytics ViewHard
Practice
Practice drill

Merge CRM orders with GA events via an identity map to build a customer-level view using joins, window functions, and monthly rollups.

SubqueriesJoinsData WranglingArtefact
The finish line: interview-readyComplete all 18 questions plus 3 hands-on drills to finish this plan.