Johnson Controls Senior Software Engineer Interview Questions and Answers

Q1. Explained about micro front end in react js
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Q1. Reason for job change
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Q2. Can i Work from office for 15 days each month?
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Q1. React , hooks concept
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Q2. Bootstrap- UI and related questions
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Arrays related problem

Q1. Oops concepts and SOLID
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Q1. What is a stack ? Write it implementation
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A stack is a data structure that follows the Last In First Out (LIFO) principle.
• Stack is a collection of elements with two main operations: push (adds element) and pop (removes top element)

• Common implementations include using arrays or linked lists

• Example: Undo feature in text editors uses a stack to store previous states
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Q2. How could we optimize a stack optimization
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Optimizing a stack involves reducing unnecessary operations and improving memory usage.
• Implementing tail call optimization to reduce stack space usage

• Using iterative algorithms instead of recursive ones to avoid stack overflow

• Minimizing the number of local variables stored on the stack

• Using dynamic memory allocation instead of fixed-size arrays to optimize memory usage
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Q1. Database query from 2 table without a common column
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Use a JOIN statement to combine data from two tables without a common column.
• Use a JOIN statement to combine data from two tables based on a different column

• Specify the columns to select from each table in the query

• Use aliases to differentiate between columns with the same name in different tables
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Q2. Design a Flight booking system
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Design a flight booking system with user authentication, flight search, booking, seat selection, and payment handling.
• Implement user authentication for secure access.

• Create a database of flights with availability and pricing.

• Allow users to search for flights based on criteria like date, destination, and number of passengers.

• Provide seat selection options for users during booking.

• Include a payment gateway for secure tra...read more
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Q1. Sorting methodologies
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Q2. Questions based on previous company projects
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Q1. Explain Oops in detail ?
Ans. 
Object-oriented programming paradigm focuses on objects and classes to organize code and data.
• OOPs stands for Object-Oriented Programming

• It focuses on objects and classes to organize code and data

• Encapsulation, Inheritance, Polymorphism, and Abstraction are key principles of OOPs

• Example: Class Car with properties like color, model, and methods like start(), stop()
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