Devon Software Services Interview Questions and Answers

Q1. Scenario of microservice saga pattern
Ans. 
The saga pattern manages distributed transactions in microservices, ensuring data consistency across services.
• Saga pattern breaks a transaction into smaller, manageable steps across multiple services.

• Each step is a local transaction that updates data and publishes an event.

• If a step fails, compensating transactions are triggered to undo previous steps.

• Example: In an e-commerce system, placing an order involves inventor...read more
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Q2. Given an integer array segregate odd and even numbers without using another array
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Segregate odd and even numbers in an integer array without using another array
• Iterate through the array and maintain two pointers, one for odd numbers and one for even numbers

• Swap elements at the odd and even pointers until all odd numbers are on one side and even numbers on the other

• Example: Input array [3, 6, 8, 5, 4], Output array [6, 8, 4, 5, 3]
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The problem statement was given to solve.

Q1. Explain liskov substitution principle with examples?
Ans. 
Liskov Substitution Principle states that objects of a superclass should be replaceable with objects of its subclasses without affecting the program's correctness.
• Subtypes must be substitutable for their base types.

• Derived classes should be able to extend the functionality of base classes without changing their behavior.

• Violating this principle can lead to unexpected behavior in the program.

• Example: If a Square class i...read more
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Q2. Importance of abstraction
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Abstraction is crucial in software development to simplify complexity, improve readability, and promote reusability.
• Abstraction helps in hiding unnecessary details and focusing on essential features.

• It allows developers to work at a higher level of understanding without getting bogged down in implementation details.

• Abstraction promotes code reusability by creating modular and reusable components.

• It improves code readab...read more
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Q3. Importance of Unit testing in clean close
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Unit testing is crucial in ensuring clean code by verifying the functionality of individual units of code.
• Unit testing helps in identifying bugs and errors early in the development process.

• It ensures that each unit of code works as expected in isolation.

• Unit tests act as documentation for the codebase, making it easier for new developers to understand and modify the code.

• It promotes code reusability and maintainability...read more
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Q1. Explain POLYMORPHISM and other oops concepts.
Ans. 
Polymorphism is the ability of a single function or method to operate on different data types.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example of compile-time polymorphism: function overloading in Java.

• Example of runtime polymorphism: method overriding in Java.

• Po...read more
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Q2. Questions were asked on the work and responsibilities in my previous company.
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Q1. How do you connect your code to database? what kind of Repository you use? Will group By work with without having
Ans. 
I connect my code to the database using a repository pattern. Group By can work without having an explicit repository.
• I use a repository pattern to abstract the database operations in my code.

• I typically use Entity Framework as my ORM to connect to the database.

• Group By can work without having an explicit repository by directly querying the database using LINQ or SQL.
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Q1. What is trigger Where is configuration available for you code
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A trigger is a special type of stored procedure that is automatically executed when certain events occur in a database.
• Triggers are used to enforce business rules, perform auditing, and maintain data integrity.

• Configuration for triggers is typically available in the database management system where the trigger is created.

• Examples of trigger events include INSERT, UPDATE, and DELETE operations on a table.
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