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Updated weekly · Last refresh Sep 21

Cognizant Backend Engineer Interview Questions

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

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1
CodingStart here. 4 questions · ~34 min
Linked Lists vs ArraysEasy

Compare arrays and linked lists by memory layout, access cost, and update performance, and explain when each is the better choice.

Linked ListsArraysSearchingCognizant
Synchronous vs Asynchronous ProgrammingEasy

Explain how synchronous and asynchronous programming differ, when each is appropriate, and how async improves I/O-bound throughput.

RecursionQueueStringsCognizant
Difference Between Interface and Abstract Class in JavaMedium

Explain the differences between interfaces and abstract classes in Java and when to use each.

Hash TablesArraysStringsCognizant
Solving a Simple ProblemEasy

Assesses your problem-solving approach and how you communicate scope and resolution.

Problem SolvingCognizant
2
Behavioral & Leadership6 questions · ~51 min
Explaining OOP Through Project DecisionsMedium

Tests technical communication and ownership by asking you to explain how OOP principles shaped real engineering decisions and outcomes.

projectstechnical experienceoopCognizant
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3
More topics3 questions · ~25 min
Understanding ACID Properties in DatabasesMedium

Explain the ACID properties of database transactions and their importance.

Cognizant
Ensuring Consistency on AWSHard

Tests your ability to design for consistency using AWS primitives and patterns.

distributed systemsdata consistencyawsCognizant
Designing RESTful APIsMedium

Tests API design principles, resource modeling, and practical tradeoffs for maintainable services.

Trade-offsRoadmappingScope ManagementCognizant

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Second Highest Trader SalaryEasy
Practice
Practice drill

Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.

SubqueriesRankingSortingeClinicalWorksNNeenOpal CanadaInformatica
Top Customers by Sales RevenueEasy
Practice
Recently asked
Practice drill

Use GROUP BY and SUM to rank the top 10 customers by total revenue from a single sales table.

RankingGroup ByAggregationsHousecall ProEquifaxXYZ
Second Largest Salary QueryEasy
Practice
Practice drill

Use DENSE_RANK and a join to find the second-highest distinct salary among active CGS program employees.

sqlCapgemini FSSBUCapgemini Government SolutionsTiger Analytics
The finish line: interview-readyComplete all 13 questions plus 3 hands-on drills to finish this plan.