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I applied via Company Website and was interviewed in Jan 2022. There were 4 interview rounds.
I applied via Referral and was interviewed in Dec 2021. There was 1 interview round.
To make a Java class immutable, use final keyword and initialize all fields in constructor.
Use final keyword for class and all fields
Initialize all fields in constructor
Do not provide setter methods
Make sure to return a new instance in any method that modifies the state
Check if two strings are anagrams of each other
Create a character count array for both strings
Compare the character count arrays
If they are equal, the strings are anagrams
REST endpoints for a ticket booking system
GET /events - get list of available events
GET /events/{id} - get details of a specific event
POST /events/{id}/tickets - book tickets for an event
GET /bookings - get list of all bookings
GET /bookings/{id} - get details of a specific booking
PUT /bookings/{id} - update a booking
DELETE /bookings/{id} - cancel a booking
Pessimistic locking is when a resource is locked for a long time, while optimistic locking is when a resource is locked only when it is being modified.
Pessimistic locking involves locking a resource for a long time to prevent other users from accessing it.
Optimistic locking involves locking a resource only when it is being modified, allowing other users to access it in the meantime.
Pessimistic locking is useful when co...
I applied via Company Website and was interviewed before Apr 2022. There were 4 interview rounds.
Shorten URL design involves generating a unique short code for a long URL to save space and improve usability.
Use a hashing algorithm to generate a unique short code for each URL
Store the mapping between short code and long URL in a database
Redirect users to the long URL when they access the short URL
Consider adding expiration time for short URLs to prevent abuse
Provide analytics to track usage of short URLs
Java performance and query optimization in Oracle
Use prepared statements to avoid SQL injection and improve performance
Use indexes to speed up query execution
Avoid using SELECT * and only select necessary columns
Use connection pooling to reuse database connections
Use caching to reduce database round trips
Tune database parameters like buffer cache and shared pool size
Use profiling tools to identify performance bottlenec
Hacker rank exam, 2 DSA coding questions
I applied via Referral and was interviewed in Jun 2021. There were 4 interview rounds.
posted on 29 Nov 2024
I applied via Naukri.com and was interviewed in Oct 2024. There were 3 interview rounds.
SQL query to retrieve student department id.
Use SELECT statement to retrieve data
Specify the columns to be selected, including the department id column
Specify the table where the student data is stored
Use WHERE clause to filter the results based on student information
Code to find index of sub string in main string and duplicate the sub string
Use a loop to iterate through the main string and check for the sub string
If sub string is found, duplicate it and store the index
Return the index of the duplicated sub string
I applied via Referral and was interviewed in Sep 2024. There were 2 interview rounds.
Use dynamic programming to find the longest palindromic substring in a given string.
Iterate through the string and expand around each character to find palindromes.
Store the length of the longest palindrome found so far.
Return the substring based on the start and end indices of the longest palindrome.
To serialize and deserialize a tree, use a recursive approach to traverse the tree and store the data in a suitable format.
Use pre-order traversal to serialize the tree by storing the node values in a list or string.
For deserialization, reconstruct the tree by recursively building nodes from the serialized data.
Consider using JSON or XML format for serialization to easily store and retrieve tree structure.
Use regex library to match given regex with string.
Use a regex library like re in Python to match the given regex with the string.
Check if the regex matches the string using the library functions.
Handle cases where the regex contains special characters like . and * appropriately.
Throttling is a technique used to control the rate of requests sent to a server.
Throttling helps prevent server overload by limiting the number of requests processed at a time.
Implementing a throttle function involves setting a maximum request rate and delaying excess requests.
Example: Implementing a throttle function in a web application to limit the number of API calls made to a third-party service.
Example: Throttlin...
Sort the squares of elements in a sorted array and return the sorted response.
Iterate through the array and square each element.
Store the squared values in a new array.
Sort the new array and return it.
A promise is a commitment to do something in the future, typically used for asynchronous operations in JavaScript.
Promises are used to handle asynchronous operations in JavaScript.
They represent a value that may be available now, in the future, or never.
Promises have three states: pending, fulfilled, or rejected.
Example: new Promise((resolve, reject) => { setTimeout(() => resolve('Done!'), 1000); });
Event loop is a mechanism that allows for asynchronous execution of code by managing the order of events in a single thread.
Event loop continuously checks the call stack for any functions that need to be executed, and processes them in a non-blocking manner.
Different types of queues in event loop include microtask queue (Promise callbacks), macrotask queue (setTimeout, setInterval callbacks), and animation frame queue
Virtual DOM is a lightweight copy of the actual DOM, used to improve performance by minimizing direct manipulation of the real DOM.
Virtual DOM is a concept used in frameworks like React to optimize rendering performance.
Changes are first made to the virtual DOM, which is then compared to the real DOM to identify the minimal updates needed.
This approach reduces the number of actual DOM manipulations, resulting in faster...
Written coding test
Basic coding questions
Only c c++
Easy level
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...
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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Hyderabad / Secunderabad,
Bangalore / Bengaluru
5-8 Yrs
Not Disclosed
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