Brane Enterprises Data Engineer Interview Questions and Answers

Hackerearth problem on reversing the string & one more array question

Q1. Reverse the string
Ans. 
Reverse a given string
• Use built-in functions like reverse() in Python

• Iterate through the string in reverse order and append characters to a new string

• Use stack data structure to reverse the string
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Q2. SQL based windowing function
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Q1. About project what are optimization you have done
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First round will be coding test which will have Core java questions

Q1. Type of Class Loaders available in java
Ans. 
Java has three types of class loaders: Bootstrap Class Loader, Extension Class Loader, and System Class Loader.
• Bootstrap Class Loader loads core Java classes located in the bootstrap classpath.

• Extension Class Loader loads classes from the extensions directory.

• System Class Loader loads classes from the classpath specified by the CLASSPATH environment variable.
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Q2. Coding question related find 3nd highest number with single loop and minimum time complexity.
Ans. 
Use a single loop to find the 3rd highest number in an array with minimum time complexity.
• Iterate through the array and keep track of the three highest numbers encountered so far.

• Update the three highest numbers as you iterate through the array.

• Return the third highest number once the loop is completed.
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Q3. What is diff between cyclicBarrier and countDownLatch?
Ans. 
CyclicBarrier allows a group of threads to wait at a barrier until all threads have reached it, while CountDownLatch allows one or more threads to wait until a set of operations being performed in other threads completes.
• CyclicBarrier is reusable, while CountDownLatch is not.

• CyclicBarrier allows all threads to wait for each other, while CountDownLatch allows one thread to wait for others.

• CyclicBarrier resets automatica...read more
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Q4. What is diff between JPARepository and CURDRepository?
Ans. 
JPARepository is a Spring Data interface for JPA-based repositories, while CRUDRepository is a generic interface for CRUD operations.
• JPARepository extends CRUDRepository and provides additional JPA-specific methods.

• CRUDRepository is a generic interface for CRUD operations on a repository.

• JPARepository is typically used for JPA-based repositories, while CRUDRepository can be used for any type of repository.

• JPARepository...read more
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Q1. Second round is pending
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Q1. What is the importance of manual testing when compared to automation testing
Ans. 
Manual testing is important for exploratory testing, usability testing, and ad-hoc testing.
• Manual testing allows for exploratory testing where testers can explore the application and identify unexpected issues.

• Usability testing, which involves real users interacting with the software, is best done manually to capture user experience.

• Ad-hoc testing, where testers randomly test the application without predefined test cas...read more
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Q2. Real life scenario on web application testing
Ans. 
Testing a web application for an online shopping platform
• Testing the functionality of adding items to the cart and checking out

• Testing the payment gateway integration for secure transactions

• Testing the search functionality to ensure accurate results are displayed

• Testing the responsiveness of the website on different devices and browsers
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Q1. Design zepto delivery system .
Ans. 
Design a zepto delivery system for efficient and fast delivery of small packages.
• Utilize drones for quick and efficient delivery

• Implement a centralized hub for package sorting and distribution

• Use GPS tracking for real-time package monitoring

• Optimize routes for faster delivery times

• Ensure secure and reliable delivery process
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Q1. Solid principals
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Q2. Difference between pure and impure pipes
Ans. 
Pure pipes do not have any side effects and always return the same output for the same input, while impure pipes can have side effects and may not return the same output for the same input.
• Pure pipes are stateless and deterministic.

• Impure pipes can have side effects like modifying global variables or making network requests.

• Examples of pure pipes include filters in Angular, while examples of impure pipes include async
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Q1. Lazy loading in react
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Q2. Cache bursting
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Q3. Difference between == and ===
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