Software Engineer · AI

Juan Carlos Díaz

Full-stack engineer with 14+ years of experience building web platforms and production systems. AI-focused work includes LLM applications with RAG, TTS pipelines, computer vision, machine learning and deep learning.

Client Work / Netherlands
Lighttown Barbershop

Custom website created for a Dutch barbershop, blending a polished retro aesthetic with a clear, responsive experience tailored to the client's brand.

Local-First · Hybrid AI · RAG
Emma 3.0

Local-first hybrid AI assistant with private on-device RAG and a choice of local models or external services, plus inconsistency detection and prompt-injection screening.

Node.js · React · Hybrid AI
Emma Node

The same version of Emma rebuilt with Node.js and React, bringing the hybrid AI assistant experience to a modern JavaScript stack.

Frontend / Design Systems
Aesthetic Store

Reusable frontend aesthetics built as executable visual references for developers and AI-assisted workflows.

Android / Offline App
Santo Rosario

Offline Android rosary app built with vanilla HTML, CSS and JavaScript, packaged with Capacitor and designed for older users with clear flow and large touch targets.

Widget / AI UI
AI Mascot

Tiny embeddable JavaScript mascot widget with moods, speech bubbles and a small public API for friendly UI feedback.

Technology
NexusGrid

Advanced technology systems platform with a cyberpunk-inspired interface for next-generation infrastructure.

TTS / Audiobook Pipeline
Audiobook Generator TTS

Local XTTS pipeline that turns narratable book scripts into audiobook-ready WAV/MP3 output with curated voices, silence cleanup, merge and ACX-style export.

Zonne-energie
LUMEX

Zonne-energie van de toekomst. Neon-futuristische interface voor de Nederlandse zonne-energiemarkt.

Web Design · Cloud Deploy · Dutch
TalkingDutch

Landing page built for my Dutch professor with HTML, CSS and JavaScript, including responsive web design work and cloud deployment.

Solar / Software
SolTech

Solar energy meets software engineering. End-to-end platform for renewable energy monitoring and optimization.

Green Energy
Verdant Energy

Clean solar solutions with a design philosophy rooted in nature. Organic, light and purposeful.

AI · YouTube · English
Clara Nightwell

Fully automated YouTube channel — history & philosophy content generated end-to-end with TTS, AI image synthesis and automated publishing. Zero human intervention.