DataMetica Architect Interview Questions and Answers

Q1. What are the design considerations for creating a Twitter-like platform that caters to various use cases?
Ans. 
Designing a Twitter-like platform requires scalability, user engagement, security, and diverse content management.
• Scalability: Ensure the platform can handle millions of users and tweets, like Twitter's infrastructure with distributed databases.

• User Engagement: Implement features like trending topics, hashtags, and notifications to keep users active and informed.

• Security: Protect user data with encryption and implement...read more
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Q2. What are the main programming paradigms
Ans. 
Main programming paradigms include procedural, object-oriented, functional, and declarative programming, each with unique approaches.
• Procedural Programming: Focuses on procedures or routines (e.g., C, Pascal).

• Object-Oriented Programming: Uses objects to represent data and methods (e.g., Java, C++).

• Functional Programming: Emphasizes functions and immutability (e.g., Haskell, Scala).

• Declarative Programming: Focuses on wh...read more
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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.

Round duration - 90 minutes
Round difficulty - Easy

There were two section Aptitude and Coding.

Q1. 
Buy and Sell Stock Problem Statement
Imagine you are Harshad Mehta's friend, and you have been given the stock prices of a particular company for the next 'N' days. You can perform up to two buy-and-sell ...read more
Ans. 
The task is to determine the maximum profit that can be achieved by performing up to two buy-and-sell transactions on a given set of stock prices.
• Iterate through the array of stock prices and calculate the maximum profit that can be achieved by buying and selling at different points.

• Keep track of the maximum profit after the first transaction and the maximum profit overall by considering different combinations of buy a...read more
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Round duration - 60 minutes
Round difficulty - Easy

This was the first technical interview.

Q1. 
Pair Sum Problem Statement
You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to find and return a list of all pairs of elements where each sum of a pair equals 'S'.
Note:
...read more
Ans. 
Find pairs of elements in an array that sum up to a given value, sorted in a specific order.
• Iterate through the array and for each element, check if the complement (S - current element) exists in a hash set.

• Keep track of pairs in a hash set to avoid duplicates.

• Sort the pairs based on the criteria mentioned in the question.

• Return the sorted list of pairs.
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Very basic aptitude questions along with few coding questions

Q1. A problem statement was given and we had to provide an optimal approach to design and handle that problem
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Q2. Oops concepts, SQL queries
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Q1. What languages did you know
Ans. 
I am proficient in several programming languages, each suited for different tasks and projects.
• JavaScript: Used for web development, creating interactive front-end applications.

• Python: Great for data analysis, machine learning, and scripting tasks.

• Java: Commonly used for building enterprise-level applications and Android development.

• C#: Utilized for developing Windows applications and game development with Unity.

• SQL: E...read more
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Q2. What are they
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The basic question is related to profit percentage, time and distance

Q1. Is the database schema of any type?
Ans. 
Yes, the database schema can be of various types such as relational, hierarchical, network, object-oriented, etc.
• Relational database schema is the most common type, using tables to store data with relationships between them.

• Hierarchical database schema organizes data in a tree-like structure.

• Network database schema allows multiple relationships between records.

• Object-oriented database schema stores data as objects with...read more
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BASIC DSA LIKE ARRAY AND STRING

Q1. System Design for Electric Charger app ?
Ans. 
System design for an electric charger app involves creating a user-friendly interface, integrating with payment systems, and ensuring efficient charging station management.
• Design a user-friendly interface for users to locate and reserve charging stations

• Integrate with payment systems for seamless transactions

• Implement efficient charging station management to monitor availability and maintenance

• Consider scalability for ...read more
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Q2. Design digram for that ?
Ans. 
Design diagram for a software developer role.
• Use UML diagrams to show class relationships and interactions

• Include components like classes, interfaces, relationships, and methods

• Consider using tools like Lucidchart or draw.io for creating the diagram
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