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Updated weekly · Last refresh Sep 22

Fiserv Software Engineer Interview Questions

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

40questions
~6htotal time
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1
CodingStart here. 20 questions · ~194 min
Java Language FundamentalsMedium

Evaluates understanding of core Java language concepts and OOP constructs.

javaoopFiserv
Detect Cycle in Linked ListEasy
Practice

Use Floyd’s two-pointer algorithm to determine whether a singly linked list contains a cycle.

Hash TablesLinked ListsTwo PointersFiserv
Advantages of Hash MapsEasy

Tests your understanding of hashing, time complexity tradeoffs, and when to use maps.

Hash TablesArraysFiserv
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2
Execution5 questions · ~48 min
Design Scalable Online PaymentsHard

Tests your system design skills for high-throughput, low-latency payment services and operational readiness.

Launch PlanningTrade-offsRoadmappingFiserv
Ensure Code QualityMedium

Tests your engineering practices for maintainability, testing, and quality gates.

Trade-offsQualityFiserv
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3
Behavioral & Leadership12 questions · ~116 min
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4
More topics3 questions · ~29 min
Optimize Slow Database QueriesMedium

Tests your approach to diagnosing and optimizing SQL performance in a production payments environment.

SubqueriesJoinsAggregationsFiserv
OOP and SQL for a FresherMedium

Assesses foundational OOP and SQL join understanding for early-career readiness.

sdlcsqloopFiserv
SQL Joins and ResultsMedium

Assesses understanding of SQL join semantics and query result reasoning.

JoinssqlFiserv
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Second Highest Without AggregatesHard
Practice
Practice drill

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsCredit GenieCisco Restaurant + BarDevoteam
SQL, APIs, and OOPMedium
Practice
Practice drill

Combine API request and SQL execution records to explain query integration and object-oriented application structure.

JoinsapisqlKaseya
Core OOP PrinciplesEasy
Practice
Practice drill

Return the four core object-oriented programming principles and their concise examples from relational data.

data relationshipssqloopGainwell Technologies
The finish line: interview-readyComplete all 40 questions plus 3 hands-on drills to finish this plan.