Denis Costelas

I am a disciplined full-stack software developer with a strong passion for programming and collaborative problem solving. I enjoy mentoring colleagues and contributing to team growth while delivering production-grade software.

At Monad Systems I developed a hospital management system in Flutter, implemented Riverpod state management, and built Vue.js dashboards with real-time updates. I engineered Firestore transactions for 15,000+ patient records and optimized queries to reduce server response times and backend read costs.

I improved security and data integrity by refining encryption processes and implemented ASP.NET Core Identity for authentication and RBAC for 5,000+ users. I also designed Google Cloud Functions (Node.js) to automate tasks and leveraged caching, lazy loading, and pagination to enhance performance.

I follow TDD practices, participate actively in Scrum, lead workshops to raise team productivity, and hold honors in regional hackathons and olympiads. I am eager to continue creating scalable, secure, and user-centered applications.