Pine Labs Principal Engineer Interview Questions and Answers

Its a combination of all the questions like aptitude , logical questions, programming questions, sql, etc,...

Q1. No i was rejected
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Its mostly on Train, Pipes and Cistern, Dice reasoning

Data Structures medium level question

Low-level design interview
I need to design a Music player app using oops concept

Q1. Sort the stack in O(1) time complexity
Ans. 
Use an additional stack to store sorted elements and maintain the minimum element at the top of the original stack.
• Create a new stack to store sorted elements.

• Pop elements from the original stack and compare with the top element of the new stack.

• If the popped element is smaller, push it to the new stack. If larger, keep popping from the new stack and push to the original stack until the correct position is found.

• Repeat...read more
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Q2. Difference between process and thread
Ans. 
A process is an instance of a program running on a computer, while a thread is a smaller unit of execution within a process.
• A process has its own memory space, while threads within the same process share memory.

• Processes are independent of each other, while threads within the same process can communicate with each other.

• Processes are heavyweight, requiring separate memory and resources, while threads are lightweight an...read more
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Q3. Difference between abstract class and interface
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructor, fields, and methods, while interface cannot have any of these.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Abstract class is used to provide a common base for multiple derived classes, while interface is used to define a contract fo...read more
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Q4. What is race condition?
Ans. 
A race condition is a situation in which the outcome of a program depends on the order of execution of its threads or processes.
• Occurs when multiple threads or processes access shared data or resources concurrently

• Can lead to unpredictable behavior or bugs in the program

• Prevented by using synchronization mechanisms like locks or semaphores

• Example: Two threads trying to increment a shared variable simultaneously
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Q5. What is normalization in dbms
Ans. 
Normalization in DBMS is the process of organizing data in a database to reduce redundancy and improve data integrity.
• Normalization involves breaking down a database into smaller, more manageable tables.

• It helps in reducing data redundancy by storing data in a structured way.

• There are different normal forms like 1NF, 2NF, 3NF, BCNF, etc.

• Example: In a database of students, instead of storing student details in multiple ...read more
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An aptitude has exam used to determine an individual skills a given activity

Q1. Tell me about yourself
Ans. I am Jagan, from poonamallee, I have completed my bachelor degree in computer science from Anna University
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Q2. What is your strength
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Q3. What is your weakness
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Q4. Why did you decide to apply to this role?
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Q5. Why should I hire you?
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Maths,verbal reasoning.
Like percentage,wages, proportional problems

Particular topic on political party

1 hour 10 mins, MERN Stack, Face to Face. Mongodb, medium DSA Question, callback, eventloop, NodeJS asynchronous working

Q1. Sql based questions, oops concepts, project related questions
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Q2. Recursion, Python, MVC, AWS services
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Q1. What is the difference between normal and arrow functions
Ans. 
Arrow functions are more concise and have a lexical 'this' binding compared to normal functions.
• Arrow functions do not have their own 'this' keyword, they inherit it from the parent scope.

• Arrow functions do not have their own 'arguments' object.

• Arrow functions cannot be used as constructors with 'new'.

• Arrow functions are more concise and have implicit return when no curly braces are used.
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Q2. All basic JS Questions to cover Hoisting closure
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Q3. They asked to show me an example using the API call
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Q4. Difference between forEach and Map
Ans. 
forEach is used to iterate over an array and perform a function on each element, while map creates a new array by applying a function to each element.
• forEach does not return a new array, while map does

• forEach does not modify the original array, while map creates a new array

• forEach is used for side effects, while map is used for transformation

• Example: forEach - array.forEach(item => console.log(item)), map - const newAr
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