Company

Cognizant

Real interview questions with expert answers, plain-English explanations, and practical examples. (11 questions)

Cognizant Full Stack Developer API Design

A new Cognizant e-commerce platform requires a set of robust and scalable APIs. As a Full Stack Developer, how would you design the API architecture, considering REST principles, data consistency, and versioning for long-term maintainability?

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Cognizant Security Engineer Authentication & Authorization

As a Security Engineer at Cognizant, how would you design a robust authentication system for a new enterprise application integrating with an existing corporate identity provider, ensuring both security and a seamless user experience?

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Cognizant Frontend Developer Performance Optimization

A critical Cognizant web application is experiencing slow initial load times and sluggish user interactions. How would a Frontend Developer diagnose and resolve these performance bottlenecks?

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Cognizant Cloud Engineer Cloud Architecture

How would a Cloud Engineer design a highly available and scalable cloud architecture for a new enterprise application at Cognizant?

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Cognizant Mobile Developer Authentication & Authorization

A new Cognizant mobile application requires a secure authentication and authorization system. As a Mobile Developer, how would you design the entire token lifecycle, including acquisition, secure storage, refresh mechanisms, and invalidation, to ensure robust security and a seamless user experience, especially with intermittent connectivity?

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Cognizant Full Stack Developer Caching

How would a Cognizant Full Stack Developer implement a multi-tier caching strategy for a high-traffic web application?

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Cognizant DevOps Engineer Security

As a DevOps Engineer at Cognizant, how would you implement a ‘shift left’ security strategy within a CI/CD pipeline, and what tools would you integrate?

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Cognizant React Developer Performance Optimization

How would a Senior React Developer diagnose and resolve performance bottlenecks in a complex Cognizant web application, and what advanced optimization techniques would they employ?

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Cognizant Data Engineer Data Structures & Algorithms

Explain the differences between Bloom filters and Count-Min sketches, and when would a data engineer use each for approximate analytics?

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Cognizant React Developer React

What’s the difference between useMemo and useCallback, and when does each actually matter for performance?

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