ProProfs UI Developer Interview Questions and Answers

Implement tail -f command

Q1. Kafka partitions
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Q2. Elasticsearch queries
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Q1. Why Browserstack?
Ans. 
Browserstack is a popular cloud-based cross-browser testing tool used by developers worldwide.
• Provides access to a wide range of browsers and devices for testing

• Allows for parallel testing to save time and increase efficiency

• Integrates with popular testing frameworks like Selenium and Appium

• Offers features like screenshots, video recordings, and debugging tools

• Used by companies like Microsoft, Twitter, and Airbnb for t...read more
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Q2. Any challenge you faced at current company?
Ans. 
Yes, I faced a challenge in integrating a new third-party API with our existing system.
• Had to understand the documentation of the API thoroughly

• Encountered compatibility issues with our system

• Worked closely with the API provider to troubleshoot and resolve issues
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Simple aptitude think logically

Basic coding string and array concepts

Q1. Object Oriented concepts
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Q2. Basic coding questions
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Q1. Object Oriented concepts
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Basic Logical programs

Q1. Explain laravel Structure
Ans. 
Laravel is a PHP framework with a structured architecture for building web applications efficiently.
• MVC Architecture: Laravel follows the Model-View-Controller pattern, separating logic, presentation, and data.

• Directory Structure: Key directories include app (application logic), config (configuration files), and routes (URL definitions).

• Eloquent ORM: Laravel provides an Object-Relational Mapping system for database int...read more
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Q2. Database migration
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Q3. What is indexing in database
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Indexing in databases improves data retrieval speed by creating a data structure that allows quick access to rows in a table.
• Indexes are like a book's index, allowing quick location of data without scanning the entire table.

• Common types of indexes include B-trees, hash indexes, and full-text indexes.

• For example, a B-tree index allows efficient range queries, while a hash index is optimal for equality searches.

• Indexes c...read more
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Q4. What is controller ,What is Route
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Q1. Why you leave your previous Company
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Q2. What is your role in previous company
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Round duration - 120 minutes
Round difficulty - Hard

This round was very difficult. I never do these much difficulty level of coding questions. But i give my best, and just do every questions by using step by step process.

Q1. 
Hourglass Pattern Problem Statement
Given an integer 'N', print an hourglass pattern based on the value of 'N'.
Input:
The first and only line of input contains an integer, denoting the value of N.
Out...read more
Ans. 
Print an hourglass pattern based on the given integer 'N'.
• Read the integer 'N' as input

• Print the top half of the hourglass pattern with decreasing numbers

• Print the bottom half of the hourglass pattern with increasing numbers

• Handle the constraints for 'N' values between 1 and 50
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Q2. 
BFS Traversal in a Graph
Given an undirected and disconnected graph G(V, E) where V vertices are numbered from 0 to V-1, and E represents edges, your task is to output the BFS traversal starting from the ...read more
Ans. 
BFS traversal in a disconnected graph starting from vertex 0.
• Use BFS algorithm to traverse the graph starting from vertex 0.

• Explore neighbor nodes first before moving to the next level neighbors.

• Consider bidirectional edges in an undirected graph.

• Output the BFS traversal sequence for each test case in a separate line.

• Ensure the BFS path starts from vertex 0 and print connected nodes in numerical sort order.
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Q3. 
Sort a Stack Problem Statement
You are given a stack. Your task is to sort the elements within the stack in ascending order using only push and pop operations. You are allowed to use one additional stack ...read more
Ans. 
Sort a given stack in ascending order using only push and pop operations with the help of an additional stack.
• Use one additional stack to assist in sorting the elements.

• Pop elements from the input stack and push them onto the auxiliary stack in sorted order.

• Keep track of the current minimum element to maintain ascending order.

• Pop elements from the auxiliary stack back to the input stack to get the sorted order.
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Round duration - 90 minutes
Round difficulty - Easy

This round is also coding round in this round we have a small video call interaction too, in which hr ask few questions to only those whose coding question is correct.

Q1. 
Next Smaller Palindrome Problem Statement
You are given a palindrome number represented as a string S. Your task is to find the largest palindrome number that is strictly less than S.
Example:
Input:
T...read more
Ans. 
Find the largest palindrome number strictly less than a given palindrome number.
• Iterate from the middle towards the start of the number and decrement the digits to create the largest palindrome less than the given number.

• Handle cases where the number is all '9's by changing the middle digit to '9' and decrementing the rest of the digits.

• If the number has an odd length, simply mirror the first half to create the largest...read more
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Q2. 
Rotting Oranges Problem Statement
You are given a grid containing oranges where each cell of the grid can contain one of the three integer values:
• 0 - representing an empty cell
• 1 - representing a fre...read more
Ans. 
Find minimum time to rot all fresh oranges adjacent to rotten oranges in a grid.
• Use Breadth First Search (BFS) to simulate the rotting process.

• Track the time taken to rot all fresh oranges.

• Return -1 if all fresh oranges cannot be rotten.

• Handle edge cases like empty grid or no fresh oranges.
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Mixture of aptitude and coding questions

Implementing a design shown on paper, using php

Q1. Technical questions asked
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Q2. And also about last company experiences
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Q1. Implement tail f
Ans. 
Implementing 'tail -f' allows real-time monitoring of file changes, displaying new lines as they are added.
• Use file handling in Python to open a file in read mode.

• Utilize a loop to continuously read new lines from the file.

• Implement a sleep function to avoid busy waiting and reduce CPU usage.

• Example: Use 'with open(filename) as f:' to manage file context.

• Use 'f.seek(0, 2)' to move to the end of the file before reading ...read more
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Consist 3 coding questions medium level

Q1. Asked about java concept
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Q2. Sql query basics
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Q1. Asked medium to advance level oops java concept
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Q2. Deep discussion over project
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Q1. Hard level linked list questions
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Q2. Advanced level sql query
Ans. 
An advanced SQL query can involve complex joins, subqueries, and aggregations to extract meaningful insights from data.
• Use JOINs to combine data from multiple tables. Example: SELECT * FROM orders JOIN customers ON orders.customer_id = customers.id;

• Utilize subqueries for filtering results. Example: SELECT * FROM products WHERE id IN (SELECT product_id FROM order_items WHERE quantity > 5);

• Implement GROUP BY for aggre...read more
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