Qentelli Senior Software Tester Interview Questions and Answers

Angular is a front-end framework while Node.js is a back-end runtime environment.

• Angular is used for building dynamic web applications with a focus on the client-side.

• Node.js is used for building server-side applications with JavaScript.

• Angular uses TypeScript for building applications while Node.js uses JavaScript.

• Angular has a large community and a lot of pre-built components while Node.js has a vast library of modul...read more

Node.js is a JavaScript runtime built on Chrome's V8 engine, enabling server-side scripting and asynchronous event-driven architecture.

• Node.js uses an event-driven, non-blocking I/O model, making it lightweight and efficient.

• It allows developers to use JavaScript on both the client and server sides, promoting code reuse.

• Node.js has a rich ecosystem of libraries and frameworks, such as Express.js for building web applic...read more

HashMap is a data structure that stores key-value pairs, allowing for efficient data retrieval based on keys.

• HashMap uses a hash function to compute an index (hash code) for each key.

• If two keys have the same hash code, they are stored in a linked list (or tree) at that index.

• Example: If keys 'cat' and 'act' have the same hash code, they will be stored together.

• HashMap allows for average O(1) time complexity for get an...read more

Annotations in Spring Boot simplify configuration and enhance code readability, enabling easier development and management of applications.

• @SpringBootApplication: Combines @Configuration, @EnableAutoConfiguration, and @ComponentScan for easy setup.

• @RestController: Indicates that a class is a controller where every method returns a domain object instead of a view.

• @Autowired: Automatically injects dependencies into Sprin...read more

Dependency Injection is a design pattern that allows for better code modularity and testing by injecting dependencies into classes.

• Dependency Injection (DI) promotes loose coupling between classes.

• It allows for easier unit testing by mocking dependencies.

• Common DI frameworks include Spring (Java) and Angular (JavaScript).

• Bean scope defines the lifecycle of beans in a Spring application: Singleton, Prototype, Request, S...read more

Effective exception handling ensures robust applications, while SOLID principles guide software design for maintainability and scalability.

• Try-Catch Blocks: Use try-catch blocks to handle exceptions gracefully, allowing the application to continue running or provide meaningful error messages.

• Custom Exceptions: Create custom exception classes to represent specific error conditions, improving clarity and control over err...read more

Vue.js lifecycle methods manage component creation, updating, and destruction, allowing developers to hook into these processes.

• created: Called after the instance is created, useful for data fetching.

• mounted: Invoked after the component is mounted to the DOM, ideal for DOM manipulations.

• updated: Triggered after data changes and the DOM is re-rendered, can be used for post-update actions.

• beforeDestroy: Called right befo...read more

Vue 3 introduces Composition API, improved performance, and better TypeScript support compared to Vue 2.

• Composition API: Vue 3 introduces the Composition API, allowing for better organization of code and reusability of logic. Example: Using 'setup()' function.

• Performance Improvements: Vue 3 is faster due to a more efficient virtual DOM and optimizations in reactivity.

• Fragment Support: Vue 3 allows components to return ...read more

I lead software development projects, mentor junior engineers, and ensure high-quality code delivery while collaborating with cross-functional teams.

• Design and implement scalable software solutions, such as a microservices architecture for a high-traffic application.

• Conduct code reviews to maintain code quality and share best practices, improving team efficiency.

• Mentor junior developers by providing guidance on coding ...read more