// FullStack Developer

JiaCheng Zhang

Full-stack developer building AI-powered products

Specializing in integrating AI solutions into existing products: workflow automation, LLM-powered features, and architectures that seamlessly bridge frontend, backend, and artificial intelligence.

portfolio.sh

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// 02 projects

Projects

Limpiacristales.net

Professional service website for client (Under development)

A local glass cleaning business needed a professional website to build customer trust and streamline client bookings and inquiries.

Next.js 15TypeScriptTailwind CSSshadcn/uiFirebase FirestoreKlaro (GDPR consent)Vercel

GDPR compliance without sacrificing analytics

Implemented Klaro and Google Analytics Consent Mode v2 to ensure explicit user consent before tracking data, achieving full GDPR compliance while maintaining crucial visibility into traffic.

WeWiza

Native mobile application with a custom Python backend

To build a complete end-to-end mobile application with a custom, self-hosted backend instead of relying on external BaaS platforms.

KotlinJetpack ComposePythonFastAPI

Custom backend over managed services

Designed and implemented a RESTful API using FastAPI to power the mobile application, choosing full control over the database structure and business logic instead of relying on Firebase or Supabase.

jczhang.dev

This portfolio website, built from scratch

I needed a personal portfolio that would showcase not only my frontend skills but also practical full-stack capabilities and integration with AI.

Next.js 15TypeScriptTailwind CSS v4SupabaseGoogle Gemini APIVercel

Context-aware chatbot with $0 infrastructure costs

Integrated a chatbot powered by Google Gemini API with custom-engineered context about my profile, successfully keeping backend and hosting costs at $0.

// 03 experience

Experience

IT Business Analyst | Software Developer

ArteConfort

April 2026 — Present

Gather and analyze business requirements from each department, translating and communicating them effectively to the technical team in China to align development with business needs.

Web Developer

Hanyu Chinese School

November 2024 — September 2025

Developed and structured web designs using custom code and WordPress, building custom interactive components with JavaScript to enhance user experience.

Software Developer Trainee

Airbus

April 2024 — June 2024

Developed internal business applications integrated with SAP using ABAP during my internship program.

// 04 ai & automation

AI & Automation

I don't just use AI tools—I integrate them directly into the stack. My focus is on moving AI from concept to production: building real features rather than isolated experiments.

💬 See the chat icon in the bottom-right corner? It is a live integration with the Google Gemini API, running right now with custom-engineered context about my profile while you read this.

Shipped

Context-Aware Chatbot (This Portfolio)

Integration with the Google Gemini API, maintaining a $0 operational cost by leveraging the free tier without sacrificing real functionality. Live in production right now.

In progress

Workflow Automation

Exploring how to automate repetitive daily tasks using AI as a decision-making layer rather than just a text generator.

Exploring

RAG with Custom Data in Supabase

Investigating how to structure dynamic context in Postgres for more precise answers, moving away from relying solely on static system prompts.

// 05 skills

Skills

Frontend

Next.js
TypeScript
Tailwind CSS
shadcn/ui
React

Backend & Data

Supabase
PostgreSQL
Firebase
Python
FastAPI
MySQL

Mobile

Kotlin
Jetpack Compose
Android

AI & Automation

Google Gemini API
n8n
Claude

Tooling

Vercel
Git

Other Languages & Frameworks

Java
C#
.NET

// 06 contact

Let's talk

Got a project in mind, an opportunity, or just want to talk shop about dev or AI? Reach out.

Email

contact.jczhang@gmail.com

Jiacheng Zhang — Full-Stack Developer & AI Integration | Madrid