Q3 Technologies Senior Software Engineer Interview Questions and Answers

I am a Senior Software Engineer with 8 years of experience in developing web applications using Java, Spring, and Angular.

• 8 years of experience in software development

• Proficient in Java, Spring, and Angular

• Worked on developing web applications

The page life cycle of ASP.Net is a series of events that occur when a web page is requested and processed by the server.

• The page life cycle consists of several stages such as initialization, loading, postback handling, rendering, and unloading.

• During the initialization stage, the page and its controls are created and their properties are set.

• In the loading stage, the page retrieves and processes the user input and upd...read more

The core components of .Net Framework include Common Language Runtime (CLR), Framework Class Library (FCL), and ASP.NET.

• Common Language Runtime (CLR) provides the runtime environment for executing .NET applications.

• Framework Class Library (FCL) is a collection of reusable classes, interfaces, and value types that provide access to system functionality.

• ASP.NET is a web application framework for building dynamic web page...read more

GC stands for Garbage Collection. It is an automatic memory management process in programming languages.

• GC is responsible for reclaiming memory that is no longer in use by the program.

• It identifies and frees up memory occupied by objects that are no longer reachable.

• GC has different algorithms like Mark and Sweep, Copying, and Generational.

• The life cycle of an object involves creation, usage, and eventual garbage colle...read more

Yes

• Use AJAX or WebSocket to send file data to the server

• Track the progress of the file upload using the 'progress' event

• Calculate the percentage of completion based on the total file size and the amount uploaded

Array is a fixed-size data structure while ArrayList is a dynamic-size data structure in Java.

• Array has a fixed length, while ArrayList can dynamically resize.

• Array can store both primitive and object types, while ArrayList can only store object types.

• Array uses square brackets [] for declaration, while ArrayList uses angle brackets <>.

• Array is more memory efficient than ArrayList.

• Array provides direct access to ...read more

Generics should be used when you want to create reusable code that can work with different types.

• Generics allow you to write code that can work with different types without sacrificing type safety.

• They provide compile-time type checking, reducing the chances of runtime errors.

• Generics promote code reusability and maintainability by allowing you to write generic algorithms and data structures.

• Using generic classes in .N...read more

Abstract class and Interface are both used for abstraction, but with some differences.

• Abstract class can have both abstract and non-abstract methods, while Interface can only have abstract methods.

• A class can implement multiple interfaces, but can only inherit from one abstract class.

• Abstract class can have instance variables, while Interface cannot.

• Abstract class provides partial implementation, while Interface provid...read more

SOLID is a set of principles for designing software that is easy to maintain, understand, and extend.

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

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

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

• I - Interface Segregation Principle: Clients shou...read more

I have used the Observer design pattern in my current project.

• Observer pattern is used to establish a one-to-many dependency between objects.

• It allows multiple objects to be notified and updated automatically when a subject object changes its state.

• In my project, we implemented the Observer pattern to notify various components of the system about changes in data.

• For example, when a user updates their profile informatio...read more

Singleton class ensures only one instance is created, while static class allows multiple instances.

• Singleton class restricts instantiation of a class to a single object.

• It provides a global point of access to the instance.

• It is useful when only one instance of a class is required throughout the system.

• Singletons can be lazy-loaded or eagerly-loaded.

• Static classes allow multiple instances and are not suitable for mainta...read more

Yes, I have worked on Entity Framework.

• I have used Entity Framework version 6.0 in my previous project.

• I have experience in designing and implementing database models using Entity Framework.

• I have used LINQ to query and manipulate data in Entity Framework.

• I have also worked with migrations and code-first approach in Entity Framework.

T4 templates are used to generate code or text files based on a template and input data.

• T4 templates automate repetitive code generation tasks.

• They can be used to generate code for data access layers, service layers, or UI components.

• T4 templates can also be used to generate configuration files or documentation.

• They provide a way to separate the logic from the generated output.

• T4 templates support customizing the gener...read more

Modifying the POCO class allows extending the entity with additional properties.

• To add extra properties, simply modify the POCO class by adding new properties.

• Ensure that the changes are reflected in the database schema if necessary.

• Update any existing code that interacts with the POCO class to handle the new properties.

• Consider the impact on serialization, validation, and any other relevant aspects.

Notice period refers to the amount of time an employee must give before leaving a job.

• Notice period is typically stated in the employment contract or company policy.

• It can range from 2 weeks to 3 months depending on the company and position.

• During the notice period, the employee is expected to fulfill their job responsibilities.

• Some companies may allow employees to buy out their notice period by paying a fee.

Developed a web-based project management tool for tracking tasks and deadlines.

• Used React for front-end development

• Implemented RESTful APIs using Node.js and Express

• Utilized MongoDB for database storage

• Incorporated authentication and authorization features for user security

I am responsible for designing, developing, and maintaining software solutions for our project.

• Designing software architecture and solutions

• Developing code and implementing features

• Maintaining and debugging existing codebase

• Collaborating with team members and stakeholders

• Participating in code reviews and testing

I lead a team of software engineers with a clear hierarchy and responsibilities.

• I am the Senior Software Engineer leading the team

• Directly reporting to me are the Software Engineers

• Below them are the Junior Software Engineers and Interns

• Each member has specific roles and responsibilities within the team

I frequently feel happy when achieving project milestones and worry when facing technical challenges.

• Happy: When successfully implementing a new feature or fixing a critical bug

• Worry: When encountering difficult technical issues or tight project deadlines

I would calmly communicate with the team member to understand the situation and work together to resolve the issue.

• Communicate with the team member to understand what happened

• Work together to identify the changes made and assess the impact

• Restore the code from a backup if available

• Implement version control practices to prevent similar incidents in the future

In tight deadlines, delivering the project is prioritized, but coding standards should not be completely ignored for long-term maintainability.

• Prioritize delivery to meet deadlines, especially in critical situations.

• Implement a minimal set of coding standards to ensure code quality.

• Use code reviews post-delivery to address any coding standard violations.

• Consider the impact of technical debt; prioritize refactoring afte...read more