Photon Interactive Senior Software Development Engineer Interview Questions and Answers

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Q1. Career goals for next 2 years
Ans. 
To become a technical lead and gain expertise in cloud computing.
• Obtain AWS Certified Solutions Architect - Associate certification

• Lead a team of junior developers on a major project

• Gain hands-on experience in building and deploying applications on cloud platforms like AWS or Azure

• Attend relevant conferences and workshops to stay updated with the latest trends in cloud computing
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Q2. Asking about advanced js and ui tech questions
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Q1. What is the internal working of a hashmap?
Ans. 
A hashmap is a data structure that stores key-value pairs and uses a hash function to map keys to their corresponding values.
• Hashmap uses a hash function to determine the index of the key-value pair in the underlying array.

• Collisions can occur when two keys hash to the same index, which is resolved using techniques like chaining or open addressing.

• Hashmap typically has an underlying array where each element is a linked...read more
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Q2. Design a Least Recently Used (LRU) cache.
Ans. 
LRU cache is a data structure that stores the most recently used items and removes the least recently used items when full.
• Use a doubly linked list to keep track of the order of items based on their usage.

• Use a hashmap to quickly access items in the cache.

• When an item is accessed, move it to the front of the linked list to mark it as the most recently used.
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Q1. What are the SOLID principles in software engineering?
Ans. 
SOLID principles are a set of five design principles in object-oriented programming to make software designs more understandable, flexible, and maintainable.
• Single Responsibility Principle (SRP) - A class should have only one reason to change.

• Open/Closed Principle (OCP) - Software entities should be open for extension but closed for modification.

• Liskov Substitution Principle (LSP) - Objects of a superclass should be re...read more
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Q2. What design patterns have you worked with?
Ans. 
I have worked with design patterns such as Singleton, Factory, Observer, and Strategy.
• Singleton pattern ensures a class has only one instance and provides a global point of access to it.

• Factory pattern creates objects without specifying the exact class of object that will be created.

• Observer pattern defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified a...read more
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It was pretty easy. Various theoretical questions on technical knowledge and 3 coding questions. Since I was applying for a .net profile, all questions were related to that only.

Q1. Coding question on inheritance.
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Q2. Coding question on Abstract classes and their application.
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Q3. Discussion on the company, their culture.
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Q4. Coding question on graph.
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Q1. Asked me my expected salary even though it was already decided when they reached out to me.
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Q2. Negotiations on the salary.
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Online zoom coding test will be there - 4 questions - 2 about output of code & 2 about technical questions.

Q1. Polymorphism and explain about virtual polymorphism
Ans. 
Polymorphism is the ability of a single function or method to operate on different types of data.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• Virtual polymorphism is achieved through virtual functions in C++.

• Virtual functions allow a function in a base class to be overridden in a derived class.

• Example: Animal class with virtual function 'makeSound' overridden in Dog a
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Q2. Write code for virtual polymorphism and explain
Ans. 
Virtual polymorphism allows objects of different classes to be treated as objects of a common superclass.
• Create a base class with virtual functions

• Create derived classes that override the virtual functions

• Use pointers or references of the base class to call the overridden functions
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Q1. About yourself should explain
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Q2. Reason for job change
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Q3. Salary negotiations and location
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Q1. Hashmap internal working
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Q2. Equals and hashcode
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Q1. Microservice design pattern
Ans. 
Microservice design pattern focuses on breaking down a large application into smaller, independent services.
• Each microservice is responsible for a specific function or feature

• Communication between microservices is typically done through APIs

• Microservices can be developed, deployed, and scaled independently

• Examples: Netflix, Amazon, Uber
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Q2. Springboot annotation
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An online coding test at coderByte. Medium level question.

Q1. Find sum of distinct elements from two given array.
Ans. 
Sum of distinct elements from two arrays
• Create a set to store distinct elements from both arrays

• Iterate through each array and add elements to the set

• Calculate the sum of elements in the set
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Q2. Discussion around Java,Spring-boot.
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Coding + Aptitude question

Q1. Basic of programming lang.
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Q2. DSA and Oop concepts questions.
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Q1. Difference between composition and aggregation
Ans. 
Composition is a strong relationship where the child object does not exist independently of the parent object, while aggregation is a weak relationship where the child object can exist independently of the parent object.
• Composition is a 'has-a' relationship, where the child object is part of the parent object.

• Aggregation is a 'has-a' relationship, where the child object is not part of the parent object and can exist in...read more
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