Cogent E Services Full Stack Developer Interview Questions and Answers

Q1. Explain architecture of project
Ans. 
The project architecture follows a microservices design pattern with separate front-end and back-end components.
• Utilizes microservices architecture for scalability and flexibility

• Separate front-end and back-end components for modularity

• May include technologies like Docker for containerization and Kubernetes for orchestration
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Q2. Async and await difference
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Async and await are keywords in JavaScript used for handling asynchronous operations.
• Async is used to define a function as asynchronous, allowing it to use the await keyword.

• Await is used to pause the execution of an async function until a Promise is settled.

• Async functions always return a Promise, which resolves with the value returned by the function.

• Using async/await makes asynchronous code easier to read and write
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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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Round duration - 120 Minutes
Round difficulty - Hard

Q1. 
Matrix Rank Calculation
Given a matrix ARR of dimensions N * M, your task is to determine the rank of the matrix ARR.
Explanation:
The rank of a matrix is defined as:
(a) The maximum number of linearly...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
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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 Problem Statement
Determine if two given strings, 'str1' and 'str2', are permutations of each other.
Explanation:
Two strings are permutations of each other if one string's characters ...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
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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. 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. 
Alternating Largest Problem Statement
Given a list of numbers, rearrange them such that every second element is greater than its adjacent elements. Implement a function to achieve this rearrangement.
Inp...read more
Ans. Brute forceSpace Complexity: O(1)Explanation: Time Complexity: O(n)Explanation:
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Round duration - 60 Minutes
Round difficulty - Hard

Cat level maths are to be solved

Java coding basic questions

Q1. Technical round interview process
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Q2. What was your previous job, what was your proevious job
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Q1. About core Java
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Q2. Coding snippets, coding, Servlets, JSP
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Q3. Salary discussion
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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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