Codalien Technologies Software Engineer 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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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. Swap Numbers
Swapping 2 numbers without any 3rd variable.
Ans. 
Tip 1 : x = x + y
Tip 2 : y= x - y
Tip 3 : x =x - y
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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
You are given a string 'STR'. The string contains [a-z] [A-Z] [0-9] [special characters]. You have to find the reverse of the string.
For example:
 If the given string is: STR...read more
Ans. 
They expected us to solve using Javascript:
Step 1 : split()
Step 2 : reverse()
Step 3 : join()
Answered by CodingNinjas
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Q2. Anagram Substring Search
Given two strings ‘STR’ and ‘PTR’. Find all the starting indices of ‘PTR’ anagram substring in ‘STR’. Two strings are anagram if and only if one string can be converted into anothe...read more
Ans. Brute Force
• We use two loops.
• Consider ‘N’ is the number of characters in the given strings ‘STR’ and ‘M’ is the number of characters in the given string ‘PTR’.
• The outer loop runs from 0 to ‘N - M - 1’ for starting indices ‘I’ of anagram.
  For each character of ‘STR’, we iterate from ‘I’ to ‘I + M -1’ and check for an anagram with the given string ‘PTR’.
• For checking, we will sort all characters of ‘STR’ from ‘I’ to ‘I + M ...read more
Answered by CodingNinjas
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Q3. Check if two expressions with brackets are same
You are given two strings which are expressions in variables. You need to compare and tell if they are similar or different. You need to return “YES” for the...read more
Ans. 
Step 1 : Using .replace() regex inside the method
Step 2 : Checking the length and returning 0 or 1
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Q4. Construct complete Binary Tree
You are given an array/list 'ARR' storing values of 'N' nodes of a binary tree.
Your task is to construct a complete binary tree from the given array in lev...read more
Ans. 
Step 1 : Using a map with regex
Step 2 : Creating an object initializing it to null
Step 3 : Taking for loop till the length
Step 4 : Checking for parent and child
Step 5 : Each child cannot have 2 parent
Step 6 : We check if there's more than one root node
Step 7 : Only one node to have no parent, which is the root node.
Answered by CodingNinjas
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Q5. Shortest substring with all characters
You have been given a string 'S' which only consists of lowercase English-Alphabet letters.
Your task is to find the shortest(minimum length) substring of &...read more
Ans. 
Step 1 : Need to have 0 index in one variable and then use .split() for the rest in the next variable
Step 2 : Take a loop start with the smallest possible substrings, then go up.
Step 3 : To make a function to check to see if all the chars in the needle are in the given string
Answered by CodingNinjas
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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. System Design
What is the event loop and event queue?
Ans. 
Tip 1 : JavaScript runtime uses a message queue, which is a list of messages to be processed
Tip 2 : Each message has an associated function which gets called in order to handle the message
Tip 3 : At some point during the event loop, the runtime starts handling the messages on the queue, starting with the oldest one
Answered by CodingNinjas
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Q2. Bankers Algorithm
Ans. 
Resource allocation and deadlock avoidance algorithm
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