ZeMoSo Technologies Senior Software Engineer 1 Interview Questions, Process, and Tips

Q1. Explain Node.js event driven architecture.
Ans. 
Node.js event driven architecture is a non-blocking, asynchronous model where events trigger callbacks.
• Node.js uses an event loop to handle asynchronous operations.

• Callbacks are registered for specific events and executed when the event occurs.

• Event emitters in Node.js trigger events that are handled by listeners.

• Example: Reading a file asynchronously in Node.js using fs module.
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Q1. DSA question, JavaScript questions, node.js, database and cloud
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Q1. Code optimisation
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2 Coding questions and Java & Spring Boot MCQs
Coding questions were on Arrays, File System in Java.

Q1. Convert a String into sub-strings based on the number of given rows in a zig-zag pattern and display as a single string P A H N I/P: "paypalishiring...read more
Ans. 
Convert a given string into sub-strings based on the number of rows in a zig-zag pattern and display as a single string.
• Create an array of strings with the number of rows specified

• Iterate through the input string and distribute characters in a zig-zag pattern

• Concatenate the sub-strings row by row to form the final output string
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Q1. Count the continuous unique character from given string "aaaaBbbbCDEaAb", O/P: a4 B4 C1 D1 E1 a2 b2
Ans. 
Count the continuous unique characters in a given string.
• Iterate through the string and keep track of the current character and its count

• If the current character is different from the previous one, print the count and reset it

• Handle both uppercase and lowercase characters separately
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It was Coding Test of around 90 mins , Technical MCQ and 2 Coding Question was asked

Q1. Multiple MCQ on NodeJS Internals
Ans. 
Multiple choice questions on NodeJS internals
• Node.js is an open-source, cross-platform JavaScript runtime environment that executes JavaScript code outside of a web browser.

• It uses the V8 JavaScript engine from Google, which compiles JavaScript directly into machine code.

• Node.js has a non-blocking, event-driven architecture that makes it lightweight and efficient for handling I/O operations.

• Common Node.js internals top...read more
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Q2. Project Based Questions
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Q1. 2 DSA Questions
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Q2. Question on LLD/HLD for Online food delivery Platform
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Basic questions on Java, Spring boot and Angular

Q1. Core Java basic questions
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Q2. Spring Boot and Angular
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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
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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
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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
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