ZeMoSo Technologies Interview Questions, Process, and Tips

It was a hacker rank test with a couple of DSA questions and a few MCQs related to core language.

Q1. DSA question to find out warmer temperatures from daily temperatures. Leetcode 739.
Add your answer
Q2. Question on designing tables for a university with students and courses. Asked to write a select query on finding out students with course and grades with MySQL.
Add your answer
Q3. Frontend questions on react related to hooks
Add your answer
Q4. Internal working of Node.js and how node processes asynchronous requests
Ans. 
Node.js is a runtime environment that executes JavaScript code outside of a web browser, using an event-driven, non-blocking I/O model.
• Node.js uses the V8 JavaScript engine to execute code.

• It uses an event-driven architecture to handle asynchronous operations.

• Node.js uses a single-threaded event loop to process multiple requests concurrently.

• Callbacks are used to handle asynchronous operations in Node.js.

• Node.js provid...read more
Answered by AI
Add your answer

Q1. Discussion on salary and benefits. This was more of a casual discussion
Add your answer

Basic questions on Java, Spring boot and Angular

Q1. Core Java basic questions
Add your answer
Q2. Spring Boot and Angular
Add your answer

Q1. Binary Search Algorithm
Ans. 
Binary search is a divide and conquer algorithm that efficiently finds the target value within a sorted array.
• Divide the array in half and compare the target value with the middle element

• If the target value is smaller, search the left half. If larger, search the right half

• Repeat the process until the target value is found or the subarray is empty
Answered by AI
Add your answer
Q2. Valid Parenthesis String
Ans. 
Check if a string of parentheses is valid
• Use a stack to keep track of opening parentheses

• Iterate through the string and push opening parentheses onto the stack

• When encountering a closing parenthesis, pop from the stack and check if it matches the corresponding opening parenthesis

• If stack is empty at the end and all parentheses have been matched, the string is valid
Answered by AI
Add your answer
Q3. Getting number of unique elements of array with in-place modification
Ans. 
Use hash set to track unique elements while iterating through array and modify array in-place
• Iterate through array and add elements to hash set to track unique elements

• Modify array in-place by removing duplicates using hash set

• Return the size of the hash set as the number of unique elements
Answered by AI
Add your answer

DSA related problems

Q1. Questions related to your tech and current project
Add your answer
Q2. Coding questions
Add your answer

Q1. Database optimization techniques
Ans. 
Database optimization techniques involve indexing, query optimization, normalization, and denormalization.
• Use indexing to improve query performance by creating indexes on frequently searched columns.

• Optimize queries by avoiding unnecessary joins, using proper WHERE clauses, and limiting the number of returned rows.

• Normalize database tables to reduce redundancy and improve data integrity.

• Consider denormalization for rea...read more
Answered by AI
Add your answer
Q2. Reactjs/Nodejs/Javascript topics covered
Add your answer

Q1. Salary discussion
Add your answer
Q2. Work and policies discussion
Add your answer

Coding test includes 2 coding questions and multiple choise questions.

Q1. Linked List medium level question
Add your answer
Q2. Graphs medium to hard level question
Add your answer
Q3. Design patterns
Add your answer

Q1. Implementation of game usign ReactJS.
Ans. 
Implementing a game using ReactJS involves creating components for game elements, managing state, handling user interactions, and updating the UI.
• Create separate components for game elements such as game board, player pieces, and score display.

• Use React state to manage game state, such as player turns, scores, and game progress.

• Handle user interactions, such as clicking on game pieces or buttons, to update game state.

• U...read more
Answered by AI
Add your answer
Q2. System design of Paytm and Microservices Architecture.
Ans. 
Paytm uses microservices architecture for scalability and flexibility in system design.
• Paytm's system design is based on microservices architecture to break down the application into smaller, independent services.

• Each service in Paytm's architecture handles a specific function, such as payments, wallet, or shopping.

• Microservices communicate with each other through APIs, allowing for easier scalability and maintenance.

• T...read more
Answered by AI
Add your answer

Q1. Salary Structure discussion
Add your answer