Implemented dual authentication and optimized EF Core queries, improving system responsiveness by 35%. Designed CQRS-based Notification Engine API handling 500+ requests/sec.

Led development of Fichosa Bank's Payment Mass Maintenance Portal using React/.NET 8, reducing operational errors by 25%.

Optimized database queries and stored procedures, reducing response times by 30%. Collaborated on frontend/backend development using React and RESTful APIs.

Developed and maintained Advisers Portal using C# (.NET 6) and SQL Server, implementing DDD architecture for improved system scalability.

Developed REST APIs and WCF services to integrate with billing systems, ensuring compliance with regional tax regulations.

Led maintenance and improvements for electronic invoicing systems used by 5,000+ clients across Latin America.