Oscar Quirós Sequeira | Full Stack Developer

I am an advanced Software Engineering student at Universidad Técnica Nacional in Costa Rica, focused on full stack development and backend engineering. Through academic, personal, and community-oriented projects, I have built web and desktop applications that integrate user interfaces, business logic, databases, authentication, and administrative tools.

My main programming languages are Java and C#, complemented by experience with PHP, JavaScript, TypeScript, Laravel, Angular, React, Node.js, ASP.NET Core MVC, and relational databases such as MySQL and SQL Server. I enjoy designing structured solutions, implementing RESTful APIs, and developing maintainable systems with clear separation of responsibilities.

I am a responsible and results-oriented developer with strong self-learning skills and a genuine interest in continuous improvement. I am currently open to junior development roles, internships, collaborative projects, and freelance opportunities where I can contribute practical solutions while continuing to grow professionally.

What can I do?

Full Stack Web Development

Development of complete web applications, combining responsive interfaces, backend logic, authentication, databases, and administrative features using modern technologies.

Relational Database Design and Management

Design, normalization, and management of relational databases using MySQL and SQL Server, with a focus on data integrity, structured queries, and efficient application integration.

Code Maintenance and Refactoring

Review and improvement of existing code to increase readability, maintainability, performance, and scalability while preserving the system's original functionality.

Backend Application Development

Implementation of business logic, validations, authentication, role management, and layered architectures using Java, C#, PHP, Laravel, Node.js, and ASP.NET Core.

RESTful API Design and Development

Design and development of RESTful APIs with structured endpoints, request validation, JWT-based authentication, error handling, and integration with relational databases.

Business Process Automation

Development of systems and backend processes that reduce repetitive work, validate information, generate reports, and support the management of organizational activities.