SPAR Hypermarkets Senior Electrical Design Engineer Interview Questions and Answers

Q1. What is ReactQuery?
Ans. 
ReactQuery is a library for managing server state in React applications.
• Provides hooks for fetching, caching, and updating data from APIs

• Automatically handles caching, background refetching, and stale data management

• Improves performance by reducing unnecessary network requests
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Q2. Have you used useMemo, useCallback
Ans. 
Yes, I have used useMemo and useCallback in React applications.
• Used useMemo to memoize expensive calculations and prevent unnecessary re-renders.

• Used useCallback to memoize functions and prevent unnecessary re-creations.

• Example: const memoizedValue = useMemo(() => calculateValue(a, b), [a, b]);

• Example: const memoizedFunction = useCallback(() => { doSomething(a, b); }, [a, b]);
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Q1. Design patterns
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Q2. IIS services questions
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Q1. Kotlin & Java + DSA
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Q2. Resume related questions
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Q1. Java and Kotlin + DSA
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Q1. General discussion
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Q1. Salary negotiation
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Given a unsorted integer array with multiple zeroes , sort the array but the position of zeroes should stay intact

Q1. Coding cum technical interview
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Q2. Simple coding test and technical question on huge volumes handling
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Q1. Based on latest project
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Q1. Clock question aptitude Hashmap question Strings Array coding problems
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The assessment consisted of an online round lasting one hour, during which there were 33 questions, all of which were challenging, including the multiple-choice questions. The questions were divided into six subsections: 1. Data Structures and Algorithms (DSA) - with a problem related to dynamic programming or recursion; 2. Java; 3. Java 8; 4. Spring; 5. Spring Boot; 6. Microservices.