Senior Software Engineer

Led the modernization of a monolithic billing system to a microservices-based architecture using .NET 7. Designed and implemented Clean Architecture with separation of concerns across application, domain, and infrastructure layers. Applied CQRS and MediatR for command/query separation, improving testability and maintainability. Built secure digital signing logic with .NET cryptographic libraries (X.509 certificates, RSA) for SAT CFDI v4.0 compliance. Developed modular frontend with React and JavaScript, improving UX and reducing iteration time. Managed PostgreSQL design and performance, implemented custom logging middleware.

Developed backend services with .NET Core and Azure Functions using WebAPI and EF Core. Built microservices incorporating Factory, Repository, and Service patterns. Created authentication and authorization middleware using JWT. Acted as DBA: designed and optimized SQL Server database objects (SPs, triggers, jobs). Contributed React-based frontend components and provided production support.

Designed and developed backend for digital wallet and rewards system using .NET 7 and Oracle. Integrated external APIs and implemented async processing with RabbitMQ. Sole developer responsible for the full lifecycle: architecture, implementation, deployment, and support.

Developed cloud-based SaaS for music royalties management using C#, .NET, Blazor, and Angular. Migrated data from FileMaker to SQL Server, created custom tools for data transformation. Designed and implemented SQL Server schema and Blazor components.

Maintained SaaS application (maintenance & pest control industry) in ASP.NET WebForms. Refactored legacy code, implemented new modules in .NET 4.6. Provided tier-3 production support and ITIL-based issue resolution.

Created custom modules and integrations for Microsoft Dynamics SL/AX/D365 using .NET. Developed backend systems, APIs, Windows services, and mobile apps (Xamarin). Performed reverse engineering and data migration.

Led a CFDI development team and implemented SAT digital invoice components. Built systems for natural gas and shipping companies using Angular and .NET Core.

Directed development of GIS-based tax management systems for municipalities. Combined backend (C#), frontend (WinForms, ASPX), and geospatial data layers. Managed full project lifecycle including client negotiation.