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Achievement: Pair Extraordinairex2Achievement: Pull Sharkx2Achievement: YOLO

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full-stack-dev-johncastrosanabria/README.md

John Castro Sanabria — Full-stack .NET, React/Angular and applied AI

Hi, I'm John 👋

Full-stack Software Engineer · .NET + React / Angular · Applied AI & Agentic Systems

I build applications around clear business rules, maintainable APIs and useful interfaces. Here you'll find banking and property-management projects, practical AI integrations and tools for agentic software engineering.

📍 San José, Costa Rica · Open to full-stack .NET, AI application engineering and agentic systems opportunities. Also open to Java / Spring Boot and Python / Flask.

Explore my portfolio ↗ · Watch technical demos · LinkedIn · X / @JohnCS97 · Contact me

🚀 Try something first

Open the PropFlow demo →
Explore rental workflows, tenants, payments and a dashboard. The hosted demo uses sample data in the frontend; no live backend is connected.

Full-stack projects

Project Why explore it? Stack
PropFlow Property management with an interactive demo and documented backend. ASP.NET Core · React · TypeScript · MySQL
Banking Accounts, transfers, a transaction ledger and administrator reversals. Explore the architecture and authorization decisions. .NET · Angular · EF Core · PostgreSQL
NovaLeave Vacation requests, role-based approvals, balance tracking and an audit trail. ASP.NET Core MVC · Razor · SQL Server

🤖 Applied AI & agentic engineering

  • Docker Coding Agent — bounded coding tasks in Docker Sandboxes, Claude/Codex backends, verification and completion reports. Start with the supported paths and V1 limitations in its README.
  • BusinessAI-Analytics — Spring Boot, React and Python/FastAPI for business dashboards, forecasting and chatbot workflows. Architecture and recorded demo inside.
  • FlaskApiProduct — Flask, SQLAlchemy and TypeScript for product/order APIs, analytics and chatbot integration. Includes setup and API documentation.

📚 Explore, learn & build

Interested in the same topics? Explore the Spanish-language learning resources:

C# / .NET learning path · Python → AI agents

Guides, runnable examples and exercises to work through. For a reproducible bug or an improvement idea, open an issue in the relevant repository with the steps, expected result and actual result.

Follow along for full-stack and agentic engineering projects. If a repository helps you, star that project to find it again. For collaboration or opportunities, let's connect.

Technical focus
  • Backend: C#, .NET / ASP.NET Core, Entity Framework Core, REST APIs and SQL Server; Java / Spring Boot and Python / Flask.
  • Frontend: React, Angular and TypeScript.
  • Architecture & delivery: Clean Architecture, explicit business rules, authorization, testing, Azure DevOps and Docker.
  • AI systems: tool-using agents, bounded execution, evaluation, verification and observable completion reports.

Pinned Loading

  1. PropFlow PropFlow Public

    Property management application with ASP.NET Core, React and TypeScript: rental workflows, tenants, payments and dashboards. Interactive frontend demo uses sample data.

    TypeScript 3

  2. Banking Banking Public

    Banking portfolio application with .NET, Angular and PostgreSQL: accounts, transfers, transaction ledger and administrator reversals. Clean Architecture and JWT authentication.

    C# 1 1

  3. docker-coding-agent-v1 docker-coding-agent-v1 Public

    Bounded AI coding-agent runner in Python: isolated Docker Sandboxes, Claude/Codex backends, verification, Git branch retrieval and completion reports.

    Python

  4. NovaLeave NovaLeave Public

    Vacation request management with C#/.NET, ASP.NET Core MVC and SQL Server. Role-based approvals, balance tracking, audit trail and optimistic concurrency.

    C# 1

  5. BusinessAI-Analytics BusinessAI-Analytics Public

    Business analytics portfolio with Spring Boot, React and Python/FastAPI: dashboards, forecasting, document workflows and bilingual chatbot. Includes a recorded demo.

    Java 3

  6. FlaskApiProduct FlaskApiProduct Public

    Flask + TypeScript product and order API with SQLite, SQLAlchemy, business analytics, dashboards and chatbot workflows. Portfolio project with setup and test documentation.

    Python 3