sergio sergioocode

Senior .NET Developer · Backend · Distributed Systems · Cloud

I design and build backend systems, APIs and business applications primarily within the Microsoft ecosystem, with a focus on maintainability, integration and production-ready solutions.

📍 Madrid, Spain · Originally from Chile

🔥 Selected work

Project	Description	Stack
🇨🇱 Sii.RegistroCompraVenta	Retrieve purchase and sales records from Chile's SII	`.NET` `C#` `Azure`
🔐 Sii.ObtenerTokenAuth	SII authentication with SOAP and digital certificates	`.NET` `SOAP` `PFX`
✅ Sii.ValidarXmlDte	Validation of electronic tax documents	`.NET` `XML` `XSD`
📄 Sii.ConvertirXmlDte	DTE XML → HTML transformation	`.NET` `XSLT` `PDF417`

💡 More projects available in my GitHub repositories.

🧾 facturacen.cl

Electronic invoicing · Automation · Business integrations

facturacen.cl is a software platform focused on electronic invoicing, document processing and business automation for the Chilean market.

I designed and developed the product architecture, data model and backend services, covering the complete lifecycle from functional analysis to implementation, deployment and evolution.

            ┌──────────────────────┐
            │    facturacen.cl     │
            └──────────┬───────────┘
                       │
          ┌────────────┼────────────┐
          │            │            │
          ▼            ▼            ▼
      .NET APIs       Azure       SQL Server
          │            │            │
          └────────────┼────────────┘
                       │
                       ▼
               Integration Layer
                       │
          ┌────────────┼────────────┐
          ▼            ▼            ▼
        REST          SOAP         Events

🌐 Visit facturacen.cl →

⚙️ Technical focus

Backend & Architecture

C# · .NET · ASP.NET Core · Web API · Minimal APIs Clean Architecture · SOLID · DDD · CQRS

Distributed Systems & Integration

REST · gRPC · SignalR · Webhooks RabbitMQ · Kafka · Redis · Background Processing

Data

SQL Server · Azure SQL · PostgreSQL Entity Framework Core · Dapper · LINQ

Cloud & DevOps

Azure · Azure Functions · Azure DevOps Docker · Kubernetes · Terraform · CI/CD

Security & Observability

OAuth 2.0 · OpenID Connect · JWT · Azure Key Vault OpenTelemetry · Serilog · xUnit · Moq

🧠 Areas I enjoy working on

🏗️ Software architecture and technical design ⚙️ Backend and distributed systems 🔌 APIs and system integration ☁️ Cloud-native and Azure solutions 📨 Event-driven and asynchronous processing 🗄️ Data-intensive applications and SQL optimization 🔐 Authentication, authorization and secure integrations 📊 Observability, reliability and production diagnostics 🔄 Legacy modernization and system evolution 🤖 Business process automation

🔗 Find me

GitHub 🐙 github.com/sergioocode

LinkedIn 💼 linkedin.com/in/sergioocode

Business 🌎 facturacen.cl

Building reliable software, integrating systems and solving real business problems.

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