Greenusys Technology Node JS Developer Interview Questions and Answers

Q1. Ask questions related to CSS, Javascript, React, Node and Cloud stuff
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They discussed some easy questions on Node JS and Dp and heap , binary search

Q1. Introduce yourself
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Q2. What is multithreading and explain its usecases.
Ans. 
Multithreading is the ability of a CPU to execute multiple threads concurrently, improving performance and responsiveness.
• Multithreading allows for parallel execution of tasks, improving performance by utilizing multiple CPU cores.

• It is commonly used in applications that require handling multiple tasks simultaneously, such as web servers, video games, and data processing.

• Multithreading can help improve responsiveness i...read more
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Q1. Basic intro with work experience and skillset
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Q1. After a quick intro jumped into coding - it was an easy DSA question which unfortunately i wasn't able to solve in best time complexity. - find 2nd max element in an array (this was in JS language) you ca...read more
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Q2. Alot of questions on vanilla JS
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Q3. Asked if i know mongoDB as its a full stack dev role - which i didnt knew so i said not prepared as of now
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Q4. Asked React questions - higher order component, hooks, useeffect, prepare lifecycle methods thouroughly
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Q1. Covered all java concepts
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Q2. Basics of spring boot
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Q1. Stream based questions, sql queries to find correct output
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Q1. Expected salary, basic hr questions, strength and weakness
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Q1. C# basic questions and asp.net
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Q2. C# basic questions about properties, object, class
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Q1. What is the work in office
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Q2. What is timings in day
Ans. 
Timings in a day refer to the different periods of time that make up a 24-hour day.
• A day is typically divided into morning, afternoon, evening, and night

• Different cultures may have different ways of dividing a day

• Timings can also refer to specific times for events or activities
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Q1. How much salary per month
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Q2. What is timing in the day
Ans. 
Timing in the day refers to the different periods or divisions of time within a 24-hour cycle.
• Timing in the day includes morning, afternoon, evening, and night.

• It helps in organizing daily activities and scheduling tasks.

• Different cultures may have different names or divisions for timing in the day, such as siesta or tea time.

• Timing in the day can also be represented using the 12-hour or 24-hour clock system.
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Q3. How to procesa I share my details
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Q4. Please tell me the process
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Role was frontend so I was given 3 task on react, one was easy just to build app similar to todo and two other where lengthy task it was related to form filling

Q1. Advanced javascript and react
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Q1. Real time task was give and I had to provide solution and explain the approach.
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Q1. Salary discussion and behaviour questions
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Round duration - 90 minutes
Round difficulty - Medium

2 Programing Questions and 30 MCQs. 
Programing questions were medium with one being array manipulation and other being graph based. 

MCQ were from OOPs concepts, SQL, Operating System and Network, prepare in depth knowledge for all the topics.

Q1. 
Count Pairs Problem Statement
You are given an array A of length N consisting only of integers. Additionally, you are provided with three integers X, Y and SUM. Your task is to count the number of pairs (...read more
Ans. 
Using HashMap or self balancing BST for fastest result.
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Q2. 
Longest Substring Without Repeating Characters Problem Statement
Given a string S of length L, determine the length of the longest substring that contains no repeating characters.
Example:
Input:
"abac...read more
Ans. Brute Force
In the brute force approach, we will use two nested loops. The outer loop is used to select the starting index of the substring and the inner loop is used to fix the ending index of the substring. After selecting the substring, we will use another loop (or a method) to check whether the substring contains all unique characters or not using a HashSet.
Space Complexity: O(n)Explanation:
O(L), where L is the len...read more
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Round duration - 90 minutes
Round difficulty - Medium

Questions on SQL and DBMS were asked in this round

Q1. What are the ACID properties in DBMS?
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Q2. Can you explain the different levels of data abstraction in a DBMS?
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Q3. What are constraints in SQL?
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Round duration - 30 minutes
Round difficulty - Medium

HR round was pretty much a casual conversation about why optum, work location, joining availablity and what qualities you would like to highlight about yourself.

Q1. Why do you want to work at Optum, and what qualities would you like to highlight?
Ans. 
Tip 1 : Go through wiki page or google about the working of the company
Tip 2 : Qualities should more aligned to the company's values.
Tip 3 : Show your interest in working with the organisation and how will you contribute to the team.
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