DBS Tech Software Developer Interview Questions and Answers

Q1. Explain event driven architecture of node.js
Ans. 
Node.js uses event-driven architecture where events trigger callbacks to handle asynchronous operations.
• Node.js uses event loop to handle asynchronous operations efficiently

• Events are emitted by various objects in Node.js like HTTP servers, file system, etc.

• Callbacks are registered to handle events and execute code when events occur
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Q1. Can you provide details about your project?
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Basic data structure related coding questions like creating a linked list and adding items to it median.
Max heap implementation.
Concurrency related questions.

Q1. Senior developer was taking the round, covering all design and architecture related questions. I was able to give a satisfactory solution.
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Q1. Just some behavioural question along with a lil bit technical questions. Asked me about my current projects and problems faced, how i gave a proper solution and how i help my team to grow.
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It had more than 30 aptitude questions and 2 coding questions

Q1. It was totally a tech round all questions were from Data structure, dbms, java, computer networking
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Q1. Tell about ur self
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Q2. What is your passion
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Q1. Streams, Multi Threading, Heap
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Round duration - 90 minutes
Round difficulty - Medium

The coding round consisted of 3 coding questions. 1st question was of 20 marks, 2nd and 3rd of 50 marks.

Q1. Minimum Number Of Operations
You are given an array 'ARR' of 'N' positive integers. You need to find the minimum number of operations needed to make all elements of the array equal. You can...read more
Ans. Brute Force
For making all elements equal you can select a target value and then you can make all elements equal to that. Now, for converting a single element to a target value you can perform a single operation only once. In this manner, you can achieve your task in the maximum of  ‘N’ operations but you have to minimize this number of operations and for this, your selection of target is very important because if ...read more
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Q2. Avoiding Traps
Given an array of 'N' elements 'OBSTACLES', where each element represents the coordinate of the obstacle on a straight line. We start jumping from point 0 and we need to reac...read more
Ans. 
I first made an array in the main function that will contain the number of prime numbers less than or equal to the index value of the array and passed into my called function. This will give me the a value for each test case. Then, int the called function I applied dynamic programming. I created a dp array and initialized all values to max integer (dp[0] = 0). For each index i, i put dp[i+1] if (i=(r1/r2)) equal to min...read more
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Q3. Longest Consecutive Sequence
You are given an unsorted array/list 'ARR' of 'N' integers. Your task is to return the length of the longest consecutive sequence.
The consecutive sequence ...read more
Ans. Brute Force
As we only need the consecutive elements in the form ['NUM', 'NUM' + 1, 'NUM' + 2,...,'NUM' + 'L']. The brute force approach is to traverse each element in the array ('NUM' = ‘ARR[i]’) and then keep finding ('NUM' + 1) in the array until we don't find the next consecutive element in the array.
 
Keep a track of the current length of the sequence. If the current length of the consecutive subsequence is gre...read more
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Round duration - 45 minutes
Round difficulty - Easy

Timing: 10:15 - 11:00 am.
The interview was online from home.

Q1. DS and OOPS Problems
The interview contained mostly data structures and oops problems. I was asked to implement the node class of linked list and queue using circular array. He also asked me to explain poly...read more
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Round duration - 45 minutes
Round difficulty - Medium

Timing: 2:15 - 3:00 PM
The interview was online from home.
There were a few audio cuts in the video call but we were able to manage regardless.

Q1. Reverse a 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. 
He asked me to write a function to reverse a string of size n. In this question I defined my string ans="" , then iterated i from n-1 to 0 and concatenated Character.toString(s.charAt(i)) to my ans and then returned ans. He followed up the question. He said “If I remove ' ”="" ' in string ans line then what will happen. I answered that it will give me a compilation error that the variable "ans" is not initialized. Then...read more
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