Persistent Systems Interview Questions, Process, and Tips

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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Write a program in react.

Q1. Optimization techniques for react
Ans. 
Optimization techniques for React include code splitting, lazy loading, memoization, and virtualization.
• Code splitting: Break down the code into smaller chunks to load only what is necessary for each page.

• Lazy loading: Load components only when they are needed, improving initial load time.

• Memoization: Cache the results of expensive function calls to avoid redundant calculations.

• Virtualization: Render only the visible e...read more
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Q2. Difference between let const and var
Ans. 
let is block scoped, const is constant, var is function scoped
• let: block scoped, can be reassigned

• const: block scoped, cannot be reassigned, but its properties can be modified

• var: function scoped, can be reassigned
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