Persistent Systems Interview Questions, Process, and Tips

Q1. What are Design Patters? What is DI?
Ans. 
Design patterns are reusable solutions to common problems in software design. DI stands for Dependency Injection, a design pattern used to inject dependencies into a class.
• Design patterns are best practices for solving common software design problems.

• DI is a design pattern where dependencies are injected into a class rather than created within the class.

• Examples of design patterns include Singleton, Factory, and Observ...read more
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Q2. What are Microservices? How to manage load balancing in Microservices?
Ans. 
Microservices are a software architecture design where applications are broken down into smaller, independent services that communicate with each other through APIs.
• Microservices are designed to be small, focused, and independently deployable services.

• Each microservice typically performs a single function or task within the application.

• Microservices communicate with each other through APIs, often using lightweight prot...read more
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Q3. Find indexes of two values in an array who's Sum is 8 or a dynamic value
Ans. 
Find indexes of two values in an array whose sum is 8 or a dynamic value
• Iterate through the array and store the indexes of each element in a dictionary with the difference between the target sum and the element as the key

• Check if the current element exists in the dictionary, if so, return the indexes of the two elements

• Handle cases where the target sum is dynamic by replacing 8 with a variable
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Q1. Code programs to solve basic string manipulations
Ans. 
Code programs to solve basic string manipulations
• Use built-in string functions like substring, replace, and split

• Implement algorithms for reversing a string, checking for palindromes, and counting occurrences of a character

• Handle edge cases like empty strings and null inputs
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Q2. SOLID Principles
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Q1. Design Patterns
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Q2. Explain and Identify Async Coding styles
Ans. 
Async coding styles involve writing code that allows for non-blocking operations and efficient use of resources.
• Callbacks: Passing functions as arguments to be executed once an asynchronous operation is completed.

• Promises: Representing a value that may be available in the future, allowing chaining of operations.

• Async/Await: Syntactic sugar for writing asynchronous code in a synchronous style.

• Event Emitters: Using event...read more
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Q1. Why leaving previous organization.
Ans. 
Seeking new challenges and opportunities for growth.
• Desire for new challenges and opportunities for growth

• Looking for a more innovative and dynamic work environment

• Seeking better work-life balance

• Relocation to a different city or country
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Q2. What motivates you at work
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Q1. Many questions on JAVA, SpringBoot,Kafka
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Q2. Core JAVA, JAVA 8, Collections, Stream,Junit
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Q1. Multiple questions on Spring , Constructors, Kafka , Flatmap, Collections, Mapping
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Q2. SQL query , HashMAp
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Q1. 1Code on Palindrome
Ans. 
A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward.
• Check if the string is equal to its reverse to determine if it is a palindrome.

• Ignore spaces and punctuation when checking for palindromes.

• Examples: 'racecar', 'madam', '12321'
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Q2. About kafka ecosystem . Basics of Producers/Consumer
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Q3. Primary/Qualifier/order annotations
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Q1. Asked about AWS resources
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Q1. Asked scripting python &shell
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Q1. General discussion
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Q1. Projects discussions
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Q1. Oops .netcore, c#, angular
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Basic MCQs on General aptitude, logical reasoning and programming questions

Q1. What is a constructor in C++?
Ans. 
A constructor in C++ is a special member function that is automatically called when an object is created.
• Constructors have the same name as the class and do not have a return type.

• They can be used to initialize the object's data members.

• Default constructors are automatically generated if no constructor is defined.

• Parameterized constructors can be defined to accept arguments during object creation.
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Q2. What is copy assignment operator?
Ans. 
Copy assignment operator is a special member function in C++ that allows one object to be assigned the values of another object of the same class.
• Copy assignment operator is denoted by the = operator.

• It is used to copy the values of one object into another object of the same class.

• It is automatically generated by the compiler if not explicitly defined.

• Example: MyClass obj1; MyClass obj2; obj2 = obj1; // Copy assignment
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Q3. What is virtualization in C++?
Ans. 
Virtualization in C++ is the process of creating a virtual version of a class or function to allow for polymorphism and dynamic binding.
• Virtualization in C++ is achieved through the use of virtual functions and inheritance.

• Virtual functions are declared in a base class and overridden in derived classes to provide different implementations.

• Virtualization allows for polymorphism, where a pointer to a base class can point...read more
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Q4. Implement String class
Ans. 
Implement a custom String class in a programming language.
• Define a class with necessary properties and methods to manipulate strings.

• Include methods for concatenation, substring, length, etc.

• Handle memory allocation and deallocation properly.

• Example: class MyString { // implementation }
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Q5. What is smart pointers?
Ans. 
Smart pointers are objects that act like pointers but provide automatic memory management.
• Smart pointers help prevent memory leaks by automatically deallocating memory when no longer needed.

• Examples include unique_ptr, shared_ptr, and weak_ptr in C++.

• They provide better memory safety compared to raw pointers.
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