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I applied via Naukri.com and was interviewed in Aug 2022. There were 3 interview rounds.
C programming was there in interview
A pointer is a variable that stores the memory address of another variable in C programming language.
Pointers are used to manipulate memory and create dynamic data structures.
They can be used to pass values between functions efficiently.
Pointers can be used to access array elements and structures.
Pointer arithmetic can be used to iterate over arrays and manipulate memory.
Null pointers are used to indicate that a pointe
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I applied via Naukri.com and was interviewed before May 2020. There were 4 interview rounds.
I applied via Company Website and was interviewed before Apr 2022. There were 3 interview rounds.
It was a face to face round. Java coding questions were discussed considering OOPS and one data structure question on Arrays.
I was interviewed in Feb 2025.
I applied via Campus Placement and was interviewed before May 2022. There were 5 interview rounds.
3 coding questions on codility platform.
DSA Round 3 questions
I applied via Naukri.com and was interviewed in Apr 2023. There were 4 interview rounds.
Indexes in MySQL are used to improve query performance by allowing faster data retrieval.
Indexes are created on one or more columns of a table.
They work by creating a separate data structure that allows for faster data retrieval.
Indexes can be created using the CREATE INDEX statement.
Indexes can also be dropped using the DROP INDEX statement.
Indexes can be used to speed up SELECT, UPDATE, and DELETE statements.
Indexes ...
include_once and require_once are PHP functions used to include files. The difference is in how they handle errors.
include_once will only include the file once, and will not throw a fatal error if the file is not found
require_once will also only include the file once, but will throw a fatal error if the file is not found
Both functions are used to include files that contain functions or variables that are needed in the
Sessions and cookies are both used for maintaining user state, but sessions are server-side and cookies are client-side.
Sessions store user data on the server, while cookies store data on the client's browser
Sessions are more secure than cookies because the data is not accessible to the client
Cookies can be used for tracking user behavior and preferences
Sessions are typically used for authentication and authorization p...
To find missing number in an array of first n numbers.
Calculate the sum of first n numbers using formula n*(n+1)/2
Calculate the sum of given array using loop
Subtract the sum of array from sum of first n numbers to get the missing number
Design a database schema for a chat application with individual and group messaging.
Create a 'users' table with unique user IDs
Create a 'messages' table with message IDs, sender and receiver IDs, message content, and timestamp
Create a 'groups' table with unique group IDs and group names
Create a 'group_members' table with group ID and user ID to track group membership
Use foreign keys to link tables together
Consider inde
SQL query to retrieve all unread messages upon user sign in
Use a JOIN statement to combine the messages and user tables
Filter the results to only show messages that have not been read by the user
Use the user's sign in information to identify which messages are unread
I am excited to join OLX because of its innovative approach to online marketplaces and its commitment to customer satisfaction.
I am impressed by OLX's user-friendly platform and its ability to connect buyers and sellers from all over the world.
I am excited to work with a team of talented developers who are passionate about creating cutting-edge technology.
I believe that OLX's focus on customer satisfaction aligns with ...
I have faced difficulties in debugging complex code and managing project timelines.
Debugging complex code with multiple dependencies
Managing project timelines with changing requirements
Working with legacy code and outdated technologies
Collaborating with team members in different time zones
Dealing with unexpected bugs and errors
I report to the Technical Lead and am part of the development team.
I report to the Technical Lead
I am part of the development team
Our website receives an average of 10,000 unique visitors per day.
Our website has a steady flow of traffic with a consistent number of unique visitors per day.
We use Google Analytics to track our web traffic and analyze user behavior.
Our peak traffic times are during weekdays from 9am to 5pm.
We have noticed an increase in mobile traffic over the past year.
Our website's traffic is primarily driven by organic search and
Find pair of elements in an array whose sum is equal to a given number K.
Iterate through the array and for each element, check if K minus the element exists in the array.
Use a hash table to store the elements and their indices for faster lookup.
If multiple pairs exist, return any one of them.
If no pair exists, return null or an appropriate message.
Session is maintained using session affinity or sticky sessions.
Session affinity ensures that a user's session is always directed to the same server.
Load balancer uses a unique identifier to route requests to the same server.
Sticky sessions can be implemented using cookies or URL rewriting.
Session replication can also be used to maintain session data across multiple servers.
Singleton pattern ensures only one instance of a class is created and provides a global point of access to it.
Create a private constructor to prevent direct instantiation of the class
Create a private static instance of the class
Create a public static method to access the instance
Ensure thread safety by using synchronized keyword or static initialization block
Examples: Logger, Configuration Manager, Database Connection
Explaining abstract class, interface and multiple inheritance in PHP.
Abstract class is a class that cannot be instantiated and can have abstract methods.
Interface is a collection of abstract methods and constants that can be implemented by a class.
Multiple inheritance is not possible in PHP, but can be achieved using interfaces.
Interfaces can be implemented by multiple classes, allowing for multiple inheritance-like be
Write a stored procedure from given tables and conditions
Identify the tables and their relationships
Determine the conditions to be used in the stored procedure
Write the SQL code for the stored procedure
Test the stored procedure to ensure it returns the desired results
To increase PHP memory at run time, modify the php.ini file or use ini_set() function.
Edit the memory_limit value in php.ini file
Use ini_set('memory_limit', '256M') function to increase memory limit at run time
Check for memory leaks in the code
Use unset() function to free up memory after use
php.ini is a configuration file for PHP that allows users to customize various settings.
Change PHP settings such as memory limit, file upload size, and error reporting
Enable or disable extensions and modules
Set timezone and language settings
Configure email settings
Control caching and session settings
Use window.location to get domain from a url in jQuery.
Use window.location to get the full url
Use .hostname to get the domain name
Use .replace() to remove 'www.' if present
WAP to find smallest palindrome number larger than given number.
Convert the given number to string and check if it is already a palindrome.
If not, increment the number and check if it is a palindrome.
Repeat until a palindrome number larger than the given number is found.
Use a while loop to implement the above steps.
WAP to check if linked list elements is a palindrome without using any extra space.
Traverse the linked list and reverse the second half of the list
Compare the first half with the reversed second half
Use two pointers to traverse the list, one at normal speed and other at double speed
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