Instant Systems Associate Software Engineer Interview Questions and Answers

Q1. Experience with tech stack
Ans. 
I have extensive experience with various tech stacks, including front-end, back-end, and database technologies.
• Proficient in JavaScript frameworks like React and Angular for building dynamic user interfaces.

• Experienced with back-end technologies such as Node.js and Express for server-side development.

• Skilled in using databases like MongoDB and PostgreSQL for data storage and management.

• Familiar with cloud services like...read more
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Q2. Discussion Regarding CTC
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Q3. Where do you see yourself after 5 years?
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2 coding questions based on DSA.

Q1. Easy coding problem.
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Q2. Medium coding problem.
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Q1. The interview emphasized team collaboration and work ethics, with a particular focus on my overall work experience at my previous company.
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Q2. What were your preferences regarding work locations, specifically your views on working from the office (WFO) compared to working from home (WFH)?
Ans. 
I prefer a mix of both working from the office and working from home.
• I believe in the benefits of face-to-face collaboration and communication that come with working from the office.

• At the same time, I appreciate the flexibility and productivity that working from home offers.

• I think a hybrid approach, where employees have the option to choose between WFO and WFH based on their tasks and preferences, is ideal.

• I have exp...read more
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Q1. Focus was on DS algo and scenario based coding questions
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Q2. Design skills and OS knowledge
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First round was a coding test which has 2 problem solving questions and 3 subjective questions based on C++

Q1. This is also based on problem solving and DSA. A small part will be OS and network.
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More of a subjective round, highly focused on OS, networking and computer architecture.

Q1. This round is with the HM, totally subjective. Highly focused on past experience, current projects etc.
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Q1. HR discussion mostly questions are related to past and current experience.
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3 coding questions

Q1. Design a Time Series Database
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A time series database stores data points with timestamps for efficient retrieval and analysis.
• Choose a suitable data model for the database

• Use a time-based partitioning scheme for efficient data retrieval

• Implement compression techniques to reduce storage requirements

• Support for querying and analyzing time-based data

• Ensure data consistency and durability

• Consider scalability and high availability

• Examples: InfluxDB, Time...read more
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DSA medium level questions were asked.

Q1. Design MakeMyTrip kind of application.
Ans. 
MakeMyTrip is a travel booking application that allows users to book flights, hotels, and holiday packages.
• Include features like flight/hotel search, booking, payment gateway integration, and user profiles.

• Implement filters for search results, reviews/ratings for hotels, and notifications for booking updates.

• Integrate maps for location tracking, weather forecasts, and customer support chatbot.

• Offer discounts, loyalty p...read more
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Q2. Oops based questions.
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Round duration - 60 minutes
Round difficulty - Easy

This was the qualification round which comprised of several MCQs and 3 coding questions.
It was held on Hackerearth from 3:00 PM to 4:00 PM.
Use of any other IDE was prohibited.

Q1. Given a problem statement and a piece of code, how would you find and correct the bug in the code?
Ans. 
To find and correct a bug in code, analyze problem statement, review code, use debugging tools, and test different scenarios.
• Understand the problem statement and expected output.

• Review the code for syntax errors, logical errors, and potential bugs.

• Use debugging tools like breakpoints, print statements, and IDE debuggers.

• Test the code with different inputs to identify the bug.

• Make necessary corrections based on the iden...read more
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Q2. 
Print Nodes at Distance K from a Given Node
Given an arbitrary binary tree, a node of the tree, and an integer 'K', find all nodes that are at a distance K from the specified node, and return a list of th...read more
Ans. 
Given a binary tree, a target node, and an integer K, find all nodes at distance K from the target node.
• Traverse the binary tree to find the target node.

• Use BFS to traverse the tree from the target node to nodes at distance K.

• Keep track of the distance while traversing the tree.

• Return the values of nodes at distance K in any order.
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Round duration - 90 minutes
Round difficulty - Medium

I was shared a link of Google Meet and the Google Docs was shared where there was 1 coding problem to be coded there and then the code was run on an IDE to check the sample tests.
Then the interview was followed by a lot of Operating System and Computer System Architecture Questions.
There were 2 Interviewers and both were helpful.
The timing was from 2:30 PM to 4:00 PM

Q1. 
Subarray Challenge: Largest Equal 0s and 1s
Determine the length of the largest subarray within a given array of 0s and 1s, such that the subarray contains an equal number of 0s and 1s.
Input:
Input beg...read more
Ans. 
Find the length of the largest subarray with equal number of 0s and 1s in a given array.
• Iterate through the array and maintain a count of 0s and 1s encountered so far.

• Store the count difference in a hashmap with the index as the key.

• If the same count difference is encountered again, the subarray between the two indices has equal 0s and 1s.

• Return the length of the longest subarray found.
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Round duration - 45 minutes
Round difficulty - Easy

The round was held on Google Meet with HR from 2:30 PM to 3:15 PM.
The HR was friendly and asked the basic questions.