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I was interviewed before Jan 2021.
Round duration - 60 minutes
Round difficulty - Easy
First round was skype based technical interview.
You are connected through screen on the terminal and basic to advanced shell scripting is asked.
They will ask basic to advanced shell commands, some shell scripting tasks and about linux kernel.
Tips: You have to be really sure in a skype interview that you know the question being asked, as you can't take much time.
A process in Linux is an instance of a running program, identified by a unique process ID (PID) and containing information about its execution.
A process is an executing instance of a program in Linux.
Each process is identified by a unique process ID (PID).
Processes can be managed using commands like ps, top, and kill.
Processes can run in the foreground or background.
Examples of processes include web servers, database s
The Linux boot process involves several stages including BIOS, bootloader, kernel initialization, and user space initialization.
BIOS (Basic Input/Output System) performs hardware initialization and loads the bootloader
Bootloader (such as GRUB) loads the Linux kernel into memory and starts its execution
Kernel initializes devices, mounts the root filesystem, and starts the init process
Init process (systemd or SysVinit) i
You can monitor file changes in Linux using tools like inotifywait, auditd, or by writing custom scripts.
Use inotifywait command to monitor file changes in real-time
Set up auditd to track file changes and system calls
Write custom scripts using tools like inotify or diff to monitor specific files or directories
You can kill all Java processes with a single command using pkill or killall commands.
Use pkill command followed by the process name 'java' to kill all Java processes: pkill java
Alternatively, you can use killall command with the process name 'java' to achieve the same result: killall java
Round duration - 60 minutes
Round difficulty - Medium
This round was also on skype.
This round was more DevOps tools oriented and language programming.
They asked me about Chef, Ansible and some other tools used for configuration management and deployment.
They ask if your familiar with AWS and other cloud services.
Also you will get to show that you can code in any scripting languages like ruby or python.
Also some database related things.
Tips: Only mention the tools you really know inside out in the resume.
Ruby program to check if a directory exists
Use the File.directory? method in Ruby to check if a directory exists
Provide the directory path as an argument to the method
Return true if the directory exists, false otherwise
SQL query optimization techniques improve performance by reducing query execution time.
Use indexes to speed up data retrieval
Avoid using SELECT * and only retrieve necessary columns
Optimize joins by using appropriate join types (e.g. INNER JOIN, LEFT JOIN)
Use WHERE clause to filter data early in the query
Avoid using subqueries if possible
Chef is a configuration management tool used in DevOps to automate infrastructure deployment and management.
Automating server configuration and management
Ensuring consistency across environments
Enabling infrastructure as code practices
Automating application deployment processes
Managing complex infrastructure at scale
Tip 1 : You should be updated with what's going on with latest devops developments.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
To check open files in Linux without using lsof, you can use the /proc filesystem.
Access the /proc/
Use the find command to search for open files in the /proc directory.
Check the /proc/sys/fs/file-nr file to see the total number of open files system-wide.
The /proc filesystem in Linux is a virtual filesystem that provides detailed information about the system's hardware, processes, and kernel.
It is a virtual filesystem located at /proc that allows access to kernel data structures.
It provides information about processes, hardware, and kernel configuration.
Files in /proc can be read to gather system information, such as CPU usage, memory usage, and network statistics.
HTTP/1.1 is a protocol for transferring data over the internet, while HTTPS/2 is a secure version of HTTP/2 with improved performance.
HTTP/1.1 is not secure by default, while HTTPS/2 provides encryption and security.
HTTP/1.1 uses multiple connections for parallel loading of resources, while HTTPS/2 uses a single connection with multiplexing.
HTTPS/2 supports header compression, reducing overhead and improving performanc...
gRPC is a high-performance, open-source RPC (Remote Procedure Call) framework developed by Google.
gRPC stands for Google Remote Procedure Call.
It uses HTTP/2 for transport, Protocol Buffers for serialization, and supports multiple programming languages.
gRPC allows for efficient communication between services in a microservices architecture.
It enables bi-directional streaming and authentication features.
Example: gRPC ca...
I applied via LinkedIn and was interviewed in Jan 2023. There were 3 interview rounds.
It was 2 coding questions of medium level
Find the longest substring in a given string that does not contain any repeating characters.
Use a sliding window approach to iterate through the string.
Keep track of the characters seen so far using a set.
Update the start and end indices of the window to find the longest substring.
Return the length of the longest substring.
I applied via Campus Placement and was interviewed before Aug 2022. There were 5 interview rounds.
There were 2 questions to test our basic coding knowledge.
Data structures are used in various applications like search algorithms, storage systems, and graph algorithms.
Search algorithms like binary search use arrays and trees for efficient searching.
Storage systems use data structures like hash tables and linked lists for organizing and accessing data.
Graph algorithms like Dijkstra's algorithm use graphs and trees for solving complex problems.
Launch modes on Android determine how a new instance of an activity is associated with the current task.
Standard: Creates a new instance of the activity in the task's stack
SingleTop: If an instance of the activity already exists at the top of the stack, it will not be recreated
SingleTask: Activity is always at the root of the task and no other activities can be on top of it
SingleInstance: Similar to SingleTask, but the
Questios based on Activity backstacks
I was interviewed before Apr 2021.
Round duration - 45 minutes
Round difficulty - Easy
This was a test where 2 coding questions were to be solved in 45 minutes.
Given a column title as it appears in an Excel sheet, your task is to return its corresponding column number.
S = "AB"
28
The seq...
Convert Excel column title to corresponding column number.
Iterate through the characters in the input string from right to left
Calculate the value of each character based on its position and multiply by 26^index
Sum up the values to get the final column number
Determine if two given strings, str1
and str2
, are permutations of each other.
Two strings are permutations of each other if the characters of one string can be re...
Check if two strings are permutations of each other.
Create character frequency maps for both strings.
Compare the frequency maps to check if they are permutations.
Handle edge cases like empty strings or strings of different lengths.
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
The importance of problem-solving skills and teamwork.
Developed problem-solving skills through challenging coursework and projects.
Collaborated with diverse teams to complete group projects.
Participated in hackathons and coding competitions to enhance skills.
Learned to manage time effectively and prioritize tasks.
Developed a strong work ethic and dedication to excellence.
CommonFloor is a real estate platform that helps people find and rent/buy properties.
CommonFloor was founded in 2007 and is based in Bangalore, India.
It offers a range of services including property listings, property management, and home loans.
The platform has over 5 million registered users and lists properties in over 200 cities in India.
In 2016, CommonFloor was acquired by Quikr, another Indian online classifieds p
I was interviewed before Feb 2021.
Round duration - 60 minutes
Round difficulty - Easy
It comprised of general aptitude questions and two coding questions. It was an offline test.
Given an integer N
, find all possible placements of N
queens on an N x N
chessboard such that no two queens threaten each other.
A queen can attack another queen if they ar...
The N Queens Problem involves finding all possible placements of N queens on an N x N chessboard where no two queens threaten each other.
Use backtracking algorithm to explore all possible configurations.
Keep track of rows, columns, and diagonals to ensure queens do not attack each other.
Generate and print valid configurations where queens are placed safely.
Consider constraints and time limit for efficient solution.
Exam...
Given an integer array arr
of size 'N' containing only 0s, 1s, and 2s, write an algorithm to sort the array.
The first line contains an integer 'T' representing the n...
Sort an integer array containing only 0s, 1s, and 2s in linear time complexity.
Use three pointers to keep track of the positions of 0s, 1s, and 2s in the array.
Iterate through the array and swap elements based on the values encountered.
Achieve sorting in a single scan over the array without using any extra space.
Round duration - 60 minutes
Round difficulty - Easy
After having a technical discussion about my CV. He gave me two questions to code.
Ninja has to determine all the distinct substrings of size two that can be formed from a given string 'STR' comprising only lowercase alphabetic characters. These su...
Find all unique contiguous substrings of size two from a given string.
Iterate through the string and extract substrings of size two
Use a set to store unique substrings
Return the set as an array of strings
Determine if a given singly linked list of integers forms a cycle or not.
A cycle in a linked list occurs when a node's next
points back to a previous node in the ...
Detect if a singly linked list forms a cycle by checking if a node's next points back to a previous node.
Traverse the linked list using two pointers, one moving one step at a time and the other moving two steps at a time.
If the two pointers meet at any point, there is a cycle in the linked list.
If one of the pointers reaches the end of the list (null), there is no cycle.
Round duration - 30 minutes
Round difficulty - Easy
This was supposed to be the HR round but out of surprise the interviewer started by giving me a question to code.
After I approached this question with the right solution he just asked about my family. After that he said to wait. After half an hour the results were announced. A total of three students were hired and I was amongst one of them.
Given an integer N
representing the number of pairs of parentheses, find all the possible combinations of balanced parentheses using the given number of pairs.
Generate all possible combinations of balanced parentheses for a given number of pairs.
Use recursion to generate all possible combinations of balanced parentheses.
Keep track of the number of open and close parentheses used in each combination.
Return the valid combinations as an array of strings.
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
I applied via Naukri.com and was interviewed before Dec 2020. There were 3 interview rounds.
Easy Lettcode questions multiple
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MagicBricks
NoBroker
PropTiger.com
99acres