DataMetica Member Technical Staff Interview Questions, Process, and Tips

Aptitude and combined coding tests

Q1. Design a parking app or design a web or mobile app where farmers can directly sell their produce
Ans. 
Design a web/mobile app for farmers to directly sell their produce.
• Create a user-friendly interface for farmers to list their produce

• Include features for farmers to set prices and quantities

• Implement a search function for buyers to find specific produce

• Include a secure payment system for transactions

• Allow farmers to track their sales and manage inventory
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Q1. You have to explain the design of your previous round
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Worst experience company is not so good

Q1. What is object oriented programming
Ans. 
Object oriented programming is a programming paradigm based on the concept of objects, which can contain data and code.
• OOP focuses on creating objects that interact with each other to solve problems

• Encapsulation, inheritance, and polymorphism are key principles of OOP

• Examples of OOP languages include Java, C++, and Python
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Q2. Questions on data structute
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Round duration - 30 minutes
Round difficulty - Medium

This was a MCQ round. 30 ques in 30 mins consisting of difficult quantitative aptitude questions were to be solved.

Round duration - 60 minutes
Round difficulty - Medium

In this test round, 2 coding questions were given. Either write the code or pseudo code

Q1. 
N Queens Problem
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.
Explanation:
A queen can attack another queen if they ar...read more
Ans. 
The N Queens Problem involves finding all possible placements of N queens on an N x N chessboard without threatening each other.
• Use backtracking algorithm to explore all possible configurations.

• Keep track of rows, columns, and diagonals to ensure queens do not threaten each other.

• Generate all valid configurations and print them out.
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Q2. 
Sort 0 1 2 Problem Statement
Given an integer array arr of size 'N' containing only 0s, 1s, and 2s, write an algorithm to sort the array.
Input:
The first line contains an integer 'T' representing the n...read more
Ans. 
Sort an array of 0s, 1s, and 2s in linear time complexity.
• Use three pointers to keep track of 0s, 1s, and 2s while traversing the array.

• Swap elements based on the values encountered to sort the array in-place.

• Time complexity should be O(N) and space complexity should be O(1).
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Round duration - 60 minutes
Round difficulty - Easy

This was a technical round with questions on DSA.

Q1. 
Reverse Words in a String: Problem Statement
You are given a string of length N. Your task is to reverse the string word by word. The input may contain multiple spaces between words and may have leading o...read more
Ans. 
Reverse words in a string while handling leading, trailing, and multiple spaces.
• Split the input string by spaces to get individual words

• Reverse the order of the words

• Join the reversed words with a single space in between
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Q2. 
Circular Linked List Detection
You are provided with the head of a linked list containing integers. Your task is to determine if the linked list is circular.
Note:
• A linked list is considered circula...read more
Ans. 
Detect if a given linked list is circular by checking if it forms a closed loop.
• Traverse the linked list using two pointers, one moving at double the speed of the other.

• If the two pointers meet at any point, the linked list is circular.

• If the faster pointer reaches the end of the list (NULL), the linked list is not circular.
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Round duration - 30 minutes
Round difficulty - Easy

HR round with typical behavioral problems.

Competitive coding, multiple choice questions

Q1. CS fundamentals, Object oriented programming, Networking, SQL
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Q2. Explain 4 concept of OOPS
Ans. 
OOPS concepts include Inheritance, Encapsulation, Polymorphism, and Abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details and showing only the necessary features.
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Q3. Explain subnet in networking
Ans. 
A subnet is a smaller network within a larger network, created by dividing the IP address range of the larger network.
• Subnets help in organizing and managing network resources efficiently.

• They allow for better security by isolating different parts of the network.

• Subnets can be created by dividing an IP address range into smaller ranges.

• For example, a company may have different subnets for different departments like HR,
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Q4. Concepts of Operating system
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Q1. Behavioral questions, questions related to project, questions related to internship
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Q1. About education
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Q2. About previous job experience & salary
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Q1. About roles & responsibilities in previous organization
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Q2. Questions related to job i have applied for
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Arrays, basics. easy, some important topics in python and sql

Q1. SQL basics question learned in online or self
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Q2. Joins, groupby, clause, projection, having
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