Paul Yoel Antezana Yana
Full stack developer & applied AI engineer
Profile
7+ years building systems for companies: ERP, sales management and invoicing, with C# .NET, React, SQL Server, PostgreSQL, Python and PHP. Since 2024 I have been bringing artificial intelligence into a production ERP: assistants and agents that operate the system, search over company data (RAG), file analysis and voice mode, with cloud and local models. I know the business side: inventory, logistics and accounting basics. Bachelor’s degree in Systems Engineering.
Experience
PCH · Full Stack & AI Developer
May 2024 – present
Lima
- Built an AI assistant integrated into the ERP and sales management system: it runs operations inside the system through agents and function calling and guides users step by step.
- Connected the models to the system using MCP, LangChain and LangGraph, combining OpenAI, Claude and Gemini with local models on Ollama depending on cost, speed and data privacy.
- Developed smart search (RAG) over company information with embeddings and a vector database, file analysis and a voice mode to operate the system by speaking.
- Develop and maintain inventory, logistics, sales, CRM and MRP modules with C# .NET, React, Python, SQL Server and PostgreSQL.
- Code daily with Claude Code, Cursor, Windsurf and Visual Studio, running agents from the terminal and UI to ship faster.
ENPROYEC · Systems Analyst
Sep 2021 – Apr 2024
Lima
- Developed the back end and front end of an ERP with C# .NET (REST API) and React (SPA, PWA).
- Performed data analysis and management reporting with SQL Server and Power BI.
SKYNET · Full Stack Developer
Jun 2019 – Aug 2021
Cusco
- Built and maintained 12+ systems for sales, transport, NGOs, education, restaurants and hotels, with payment gateways and invoicing.
- ASP.NET (REST API, Windows Forms), PHP (REST API, MVC), Vue.js and React with TypeScript (SPA, PWA) and testing with Jest.
Yarbys · Founder & developer
2023 – present
Own venture, in parallel
- Building Yarbys (yarbys.com) since 2023: a multi-tenant business management SaaS with sales, purchasing, inventory, cash register and electronic invoicing. Goes into production in late November 2026.
- Integrate WhatsApp, Messenger and Instagram through the official Meta API.
Freelance · Developer
Apr 2016 – present
In parallel
- Build automated bots and workflows with n8n and Make, and AI assistants for businesses.
- Built 20+ websites with WordPress and Drupal, and Sedna, my own SCSS and JavaScript library.
Early years
2014 – 2018
Cusco
- Code Perú, 2018. Led Reinco, a project management mobile app for a construction company, in Xamarin C#.
- I.E.S.T.P. Vilcanota, 2018. Internship: website, internal procedures platform and IT support.
- La Fonera, 2017. WordPress website and Adobe InDesign automation to generate magazines.
- CETPRO El Pacífico, 2014 – 2016. Instructor of Office, graphic design and advanced Excel; wrote the manual for each course.
Tools
- Artificial intelligence
- OpenAIClaudeGeminiOllamaRAGEmbeddingsVector databasesAI agentsFunction callingMCPLangChainLangGraphPrompt engineeringVoice assistantsDocument analysis
- AI-assisted development
- Claude CodeCursorWindsurfVisual StudioVS CodeCLI agents
- Automation
- n8nMakeWhatsApp Business APIMeta APIChatbotsCRM integration
- Back end
- C# .NETAPI RESTPythonPHPLaravelNode.jsGo
- Front end
- ReactTypeScriptJavaScriptVue.jsAngularAstroHTMLCSS / SASS
- Data
- SQL ServerPostgreSQLMySQLPower BI
- DevOps & cloud
- DockerGit / GitHubAzure DevOpsAWS (basics)Azure (basics)
- Business
- ERPMRPCRMInventoryLogisticsSUNAT e-invoicingAccounting (basics)
- Other
- ScrumJestFigmaAdobe XDWordPressDrupal
Education
- Bachelor’s degree in Systems EngineeringUniversidad Continental, Lima
- Technical degree in Computing and ITI.E.S.T.P. Vilcanota, Sicuani, Cusco · 2016 – 2018
Languages
- QuechuaMother tongue
- SpanishNative
- EnglishIntermediate, studied at UNSAAC, Cusco (2019 – 2021)