Axonator Full Stack Developer Interview Questions and Answers

Few coding tasks asked like palindrome number
Factorial
Basic concept tests based on DSA
Like prove that set is unordered

Q1. If a glass is started filling with water by 1ml at 0sec and gets doubled at every successive second, at what second the glass is half full
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It was easy to crack ill rate 2/5

It was a short coding round pretty easy

It was a long coding round i couldn't crack it

Q1. Introduce yourself
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Q2. Tell me what you know about zoho
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Q1. Project, Oops Concept, Java , which technology u have used ? Framework
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Q2. Framework, Explain Long Polling ,
Ans. 
Long polling is a web technique where the client sends a request to the server and the server holds the connection open until new data is available.
• Long polling is a variation of the traditional polling technique where the client sends a request to the server and the server keeps the connection open until new data is available.

• It is often used in web applications to simulate real-time updates without the need for const...read more
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Q3. GraphQL Vs Rest
Ans. 
GraphQL is a query language for APIs that allows clients to request only the data they need, while REST is an architectural style for designing networked applications.
• GraphQL allows clients to request specific data in a single request, reducing over-fetching and under-fetching of data.

• REST uses multiple endpoints for different resources, leading to multiple requests for related data.

• GraphQL provides a strongly typed sc...read more
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Round duration - 120 Minutes
Round difficulty - Hard

Q1. Find rank
You are given a matrix ‘ARR’ having dimensions ‘N*M’. Your task to find the rank of the matrix ‘ARR’.
The rank of a matrix is defined as:
(a) The maximum number of linearly independent column ...read more
Ans. Row Echelon Form
Approach:
• The idea is based on converting the given input matrix ARR into row echelon form.
• Since we know that the rank of the matrix can not be greater than min(N, M). So we will check if N > M then we will transpose the input matrix ARR since we are using row echelon form so the matrix has to be transformed in such a way that in each row all the elements to the left of the diagonal element must be ze...read more
Answered by CodingNinjas
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Round duration - 60 Minutes
Round difficulty - Medium

This is an elimination round. The interviewer will ask some technical questions and ask to solve some coding questions.
The interview was on Microsoft teams and coding was on codility.

Q1. Check Permutation
For a given two strings, 'str1' and 'str2', check whether they are a permutation of each other or not.
Permutations of each other
Two strings are said to be a permutatio...read more
Ans. Frequency Array Approach
• The first and the foremost condition for two strings to be the permutations of each other is that the frequency of each element in both of them should be the same.
• It can be proven by a very simple argument that we are only rearranging the letters, and not adding or deleting any character.
• So we allocate an array of size 256 (that is the number of distinct ASCIIacharactersterst to store the freque...read more
Answered by CodingNinjas
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Round duration - 60 Minutes
Round difficulty - Hard

Interviewers asked some questions regarding System design and then asked me to perform the task

Q1. System Design Question
Design a vending machine.
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Round duration - 60 Minutes
Round difficulty - Hard

There were 2 interviewers. This round was basically Distributed systems.

Q1. Ninja And Alternating Largest
Ninja is given a few numbers, and he is being asked to rearrange the numbers so that every second element is greater than its left and right element.
Input Format:
The first...read more
Ans. Brute forceSpace Complexity: O(1)Explanation: Time Complexity: O(n)Explanation:
Answered by CodingNinjas
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Round duration - 60 Minutes
Round difficulty - Hard

Q1. SQL Questions
Write an SQL query to print the first three characters of  FIRST_NAME from Worker table.
Write an SQL query to print the FIRST_NAME from Worker table after replacing ‘a’ with ‘A’.
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Q1. What is cobol and jcl
Ans. 
COBOL is a programming language used for business applications. JCL is a job control language used to execute mainframe jobs.
• COBOL stands for Common Business Oriented Language

• COBOL is used for developing business applications such as banking, insurance, and finance

• JCL is used to specify the sequence of jobs to be executed on a mainframe computer

• JCL is used to allocate resources such as memory and disk space for the job
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Q2. Cobol is application language
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Round duration - 90 minutes
Round difficulty - Medium

Q1. Find All Subsets
You are given an array ‘arr’ of ‘N’ distinct integers. Your task is to find all the non-empty subsets of the array.
Note: You can return the subsets in any order, you don’t have to speci...read more
Ans. Power Set Using Bit-Masking
 
One of the standard and useful method of finding the power set is through bit-masking.
Consider a number with N-bits in its binary representation, if we consider that the state of i^th bit depicts whether the i^th array element is included in the current subset or not, then we can uniquely identify one of the subsets (as each number has a different binary representation).
Now we can simply ...read more
Answered by CodingNinjas
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Round duration - 60 Minutes
Round difficulty - Medium

The technical question was mainly based on my resume, followed by coding questions.

Q1. Technical Questions
When do you prefer to use Bokeh and when would you prefer Matplotlib?
Explain the machine learning project on your resume?
She gave a situation, and asked what would I implement Supervised...read more
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Round duration - 30 Minutes
Round difficulty - Easy

It was a coding round

Q1. Reverse Linked List
Given a singly linked list of integers. Your task is to return the head of the reversed linked list.
For example:
The given linked list is 1 -> 2 -> 3 -> 4-> NULL. Then th...read more
Ans. Brute Force
The brute force approach is to use recursion. First, we reach the end of the Linked List recursively and at last node, we return the last node, which becomes the new head of the partially reversed Linked List. While coming back from each recursion call we add the current node in the current recursion call to the last node of the partially reversed Linked List and assign the current node to null.
 
Steps:
&...read more
Answered by CodingNinjas
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Round duration - 20 Minutes
Round difficulty - Easy

Q1. Basic HR Questions
What are you hobbies?
What are your salary expectations?
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