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FinOS Technologies Software Engineer Interview Questions

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

7questions
~1htotal time
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1
System DesignStart here. 3 questions · ~25 min
Spring Boot Microservices AdvantagesMedium

Evaluates your knowledge of Spring Boot capabilities for building and operating microservices.

architecturespring bootmicroservicesFFinOS Technologies
Designing High-Performance REST APIsMedium

Tests your ability to design REST APIs with performance and scalability considerations.

restapi designperformanceFFinOS Technologies
Dependency Injection in SpringMedium

Evaluates your understanding of dependency injection patterns and Spring configuration.

design patternsdependency injectionFFinOS Technologies
2
More topics4 questions · ~33 min
Java OOP Principles ExplainedEasy

Explain the four core OOP principles in Java with examples of classes, inheritance, abstraction, and polymorphism.

RecursionHash TablesStringsFFinOS Technologies
Explain SQL Join TypesEasy

Explain INNER, LEFT, RIGHT, FULL OUTER, CROSS, and SELF JOINs with examples and when to use each.

JoinsData WranglingGroup ByFFinOS Technologies
Core Java OOP ConceptsEasy

Tests your understanding of fundamental Java object-oriented programming concepts.

javaFFinOS Technologies
OOP Encapsulation and PrivateMedium

Assesses your knowledge of OOP principles and Java access control.

sqloopFFinOS Technologies

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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
Top Daily Rides by VehicleMedium
Practice
Practice drill

Rank the top 3 completed rides per vehicle per day using joins, a CTE, and ROW_NUMBER.

Window FunctionsJoinsData WranglingWaymoCruise
Find Spending Variance Drivers by DepartmentHard
Practice
Practice drill

Use joins and LAG to isolate departments driving a large month-over-month spending variance.

JoinsData WranglingGroup ByState of CaliforniaUniversity of ChicagoThe Church of Jesus Christ of Latter-day Saints
The finish line: interview-readyComplete all 7 questions plus 3 hands-on drills to finish this plan.