Codalien Technologies Interview Questions, Process, and Tips

Shared a written coding test.

Q1. First round to ask things from resume and basic questions on Java and database.
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Q1. Logical problems solving round.
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Q2. Build an authentication system for bank.
Ans. 
An authentication system for a bank should have multiple layers of security to protect sensitive information.
• Use multi-factor authentication (MFA) to verify user identity

• Implement encryption to protect data in transit and at rest

• Use secure protocols such as HTTPS and TLS

• Implement access controls to limit user permissions

• Regularly update and patch the system to address vulnerabilities
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Q1. General discussion about the prior industry experience.
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Case Study of a Successful Product

Q1. Strategize a scenario for a product release and its success in the market.
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Q1. Cultural Fit Related Questions. It was a fun and healthy discussion with the team leads and HR.
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My assignment was to design an user interface of an AI-enabled application of makeup and beauty application

I had to develop a user interface and UX of a meeting room booking application

Q1. What would be your first Instinct for designing a product?
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Q2. What are your research sources for designing products?
Ans. 
Research sources for designing products include user interviews, surveys, competitor analysis, user testing, and analytics.
• User interviews to gather insights directly from target users.

• Surveys to collect quantitative data and feedback from a larger audience.

• Competitor analysis to understand industry trends and best practices.

• User testing to validate design decisions and identify usability issues.

• Analytics to track user...read more
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Round duration - 20 minutes
Round difficulty - Easy

Around 8 pm I got the call from Interviewer. The interview was friendly, Only one problem was asked then general discussion.

Q1. How would you swap two numbers without using a third variable?
Ans. 
To swap two numbers without using a third variable, use arithmetic operations.
• Add the two numbers together and store the result in one of the variables.

• Subtract the second number from the sum and store the result in the second variable.

• Subtract the original first number from the sum and store the result in the first variable.
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Round duration - 90 minutes
Round difficulty - Hard

It was given the flexibility of 1 day to take as per our convenience. The Environment of Coderbyte was good. Ten MCQs and five coding questions were asked.

Q1. 
Reverse the String Problem Statement
You are given a string STR which contains alphabets, numbers, and special characters. Your task is to reverse the string.
Example:
Input:
STR = "abcde"
Output:
"e...read more
Ans. 
Reverse a given string containing alphabets, numbers, and special characters.
• Iterate through the string from the end to the beginning and append each character to a new string.

• Use built-in functions like reverse() or StringBuilder in languages like Python or Java for efficient reversal.

• Handle edge cases like empty string or strings with only one character separately.

• Ensure to consider the constraints provided such as t...read more
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Q2. 
Anagram Substring Search
Given two strings 'STR' and 'PTR', identify all starting indices of 'PTR' anagram substrings in 'STR'. Two strings are anagrams if one can be rearranged to form the other.
Input:
...read more
Ans. 
Find starting indices of anagram substrings of PTR in STR.
• Iterate through STR using a sliding window of size M to check for anagrams with PTR.

• Use a hashmap to store the frequency of characters in PTR and the current window of STR.

• If the hashmap matches, add the starting index of the window to the result list.
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Q3. 
Expression Equality Checker
Given two strings representing expressions in variables, determine if they are equivalent. Return 'YES' if the expressions are identical and 'NO' if they are different. Each ex...read more
Ans. 
Determine if two expressions are equivalent by evaluating them with different variable assignments.
• Parse the expressions to evaluate them with different variable assignments.

• Use a stack to keep track of operands and operators while evaluating the expressions.

• Check if the final results of both expressions are the same to determine equivalence.
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Q4. 
Construct Complete Binary Tree Problem Statement
Given an array or list 'ARR' containing values for 'N' nodes of a binary tree, your task is to construct a complete binary tree in a level order fashion. T...read more
Ans. 
Construct a complete binary tree in level order fashion from given array of values for nodes.
• Create a queue to store nodes

• Start with the first element as the root node

• Pop the front node from the queue and assign its children from the array

• Continue until all nodes are processed
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Q5. 
Shortest Substring with All Characters
Determine the shortest substring of the string S that includes every character from S at least once. If multiple shortest substrings exist, return the one that start...read more
Ans. 
Find the shortest substring in a string that contains all unique characters.
• Use a sliding window approach to find the shortest substring with all unique characters.

• Keep track of the characters in the current window using a hashmap.

• Move the window's start index to the right until all characters are included.

• Return the shortest substring found.

• Example: For input 'abcba', the output should be 'abc'.
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Round duration - 60 minuted
Round difficulty - Medium

Afternoon at 2 pm, The interviewer was friendly. Two questions and then general discussion.

Q1. What is the event loop and event queue in system design?
Ans. 
The event loop is a mechanism that allows for efficient handling of multiple events in a system, while the event queue stores events waiting to be processed.
• The event loop continuously checks for events in the event queue and processes them one by one.

• Events can include user inputs, system notifications, or timer expirations.

• The event queue acts as a buffer, holding events until the event loop is ready to process them.

• ...read more
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