Senior Software Product Engineer Interview Questions and Answers

Authentication and authorization can be implemented in Web API using various methods such as OAuth, JWT, and Identity Framework.

• Use OAuth for third-party authentication and authorization

• Use JWT for token-based authentication and authorization

• Use Identity Framework for role-based authentication and authorization

• Implement HTTPS to secure communication between client and server

• Use secure password storage techniques such as hashing and salting

• Implement rate limiting to prevent br...read more

Token based authentication is a security mechanism that uses a token to authenticate a user instead of a password.

• Tokens are generated by the server and sent to the client upon successful login

• The client then sends the token with each subsequent request to the server

• The server verifies the token and grants access to protected resources

• Tokens can have an expiration time and can be revoked by the server

• Examples include JWT, OAuth2, and SAML

SOLID principles are design principles for object-oriented programming.

• Single Responsibility Principle: A class should have only one reason to change.

• Open-Closed Principle: Software entities should be open for extension but closed for modification.

• Liskov Substitution Principle: Subtypes must be substitutable for their base types.

• Interface Segregation Principle: Clients should not be forced to depend on interfaces they do not use.

• Dependency Inversion Principle: High-level modu...read more

Design patterns are reusable solutions to common software problems.

• Design patterns provide a common language for developers to communicate solutions.

• Examples include Singleton, Factory, Observer, and Decorator patterns.

• Design patterns can improve code quality, maintainability, and scalability.

• Patterns can be categorized into creational, structural, and behavioral patterns.

• Understanding design patterns is important for senior software engineers.