Persistent Systems Software Developer Interview Questions, Process, and Tips

Q1. What is dependency Injection, how can we implement multiple interference?
Ans. 
Dependency Injection is a design pattern where components are given their dependencies rather than creating them internally.
• Dependency Injection helps in making components more modular, testable, and reusable.

• It can be implemented using constructor injection, setter injection, or interface injection.

• Multiple inheritance can be implemented in languages like C++ using virtual inheritance to avoid the diamond problem.
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Q2. Define SOLID Principles
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SOLID principles are a set of five design principles that help 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 replaceable with objects o...read more
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Q1. Content negotiation
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Q2. What is sql injection
Ans. 
SQL injection is a type of cyber attack where malicious SQL code is inserted into input fields to manipulate a database.
• SQL injection occurs when a user input is not properly sanitized and allows an attacker to execute malicious SQL commands.

• It can lead to unauthorized access to sensitive data, data loss, and even complete server takeover.

• Example: Entering ' OR '1'='1' into a login form to bypass authentication and gai
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Aptitude test along with a code. This was online.

Q1. There were two technical interviews.
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Q2. They asked to basically explain the logic and write the code.
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Q1. They asked about achievements and certifications.
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Basic java dsa question aptitude question

2 String question were asked of medium level.

Q1. Oops concept and programming
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Q2. What is encapsulation
Ans. 
Encapsulation is the concept of bundling data and methods that operate on the data into a single unit.
• Encapsulation helps in hiding the internal state of an object and restricting access to it.

• It allows for better control over the data by preventing direct access from outside the class.

• Encapsulation also helps in achieving data abstraction, where the internal details are hidden and only the necessary information is exp...read more
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Q3. What is 1 nf 2nf
Ans. 
1NF and 2NF are normalization forms in database design to reduce redundancy and improve data integrity.
• 1NF (First Normal Form) ensures that each column in a table contains atomic values and there are no repeating groups.

• 2NF (Second Normal Form) builds on 1NF by ensuring that all non-key attributes are fully functional dependent on the primary key.

• For example, if we have a table 'Orders' with columns 'OrderID', 'Product...read more
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Q4. Write a program to demonstrate virtual function
Ans. 
A program demonstrating virtual function in C++
• Create a base class with a virtual function

• Create derived classes that override the virtual function

• Instantiate objects of derived classes and call the virtual function
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Q5. One question to convert 1nf to 2nf
Ans. 
To convert 1NF to 2NF, identify partial dependencies and move them to separate tables.
• Identify the primary key in the 1NF table

• Identify any non-key attributes that are dependent on only part of the primary key

• Move these attributes to a new table with a composite key including the partial key and the original primary key
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Q6. One table was given and we had to identify whats the state of normalization
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