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IT & Software Development Projects - J. E. Castañeda

IT & Software Development

Welcome to the IT & Software Development section of my professional hub. Here, I showcase my expertise in full stack development, artificial intelligence, and data science.

Projects & Programs

Below are some of the software, AI and engineering systems I have developed, including live SaaS and commerce examples.

Each project is reachable directly from this route and rendered in the initial HTML for better discoverability.

⚡ Forecasting Power Demand Peaks in Europe

Full-stack ML system for real-time energy demand forecasting across 20+ European countries. This project combines data engineering, predictive modeling, and backend API development: 🔁 ETL pipeline with Prefect 2, collecting hourly demand data via the ENTSO-E API. 🌦️ Enriched with temperature and calendar features (weekends, holidays). 🤖 LightGBM regression model trained to predict short-term consumption peaks. 🧠 FastAPI-powered REST API serving real-time predictions. 🗃️ Data stored in Parquet format, organized by country and month. 🧪 Fully testable, modular, and production-ready architecture. Tech Stack: Python, Prefect, DuckDB, FastAPI, LightGBM, Pandas, Docker.

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⚡ Forecasting Power Demand Peaks in Europe 1
⚡ Forecasting Power Demand Peaks in Europe 2
⚡ Forecasting Power Demand Peaks in Europe 3
⚡ Forecasting Power Demand Peaks in Europe 4

🧾 EnRegla2026

AI-assisted administrative workflow SaaS focused on guided case intake, document workflow and controlled operational decisions. This project combines product execution, workflow design and production-oriented SaaS architecture: 🤖 Guided AI-assisted intake designed to avoid premature conclusions when information is incomplete or contradictory. 📂 Document workflow and checklist generation for structured administrative cases. 💳 Stripe payment activation, protected user sessions and admin tooling. 📊 Analytics, deployment controls and production-minded operational flows. Tech Stack: Astro, TypeScript, AI workflow design, authentication, Stripe and SaaS operations.

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🧾 EnRegla2026 1
🧾 EnRegla2026 2

WebShop / Eshop Demo

Live storefront example built into JayTechWorks as a multilingual technical catalog and inquiry workflow. This demo showcases: 🛍️ Product catalog, category navigation and localized product pages. 🌍 Language-aware routing for multiple markets. 🧾 Inquiry cart flow for technical product requests. 🛠️ Demo admin/backoffice experience connected to the storefront structure. Example: https://www.jaytechworks.com/eshop

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WebShop / Eshop Demo 1
WebShop / Eshop Demo 2

Statistics Dashboard

Dashboard in React with user grafics and real-time data.

Statistics Dashboard 1
Statistics Dashboard 2
Statistics Dashboard 3