John Carlos Sebuco — Senior Full Stack Developer and AI Engineer
Hello — welcome to my portfolio
I'm John Carlos Sebuco,
Senior Full Stack Developer
& AI Engineer
I build AI-powered web products end to end — schema, interface, deploy. 24 of them are running in production right now.
Expertise in
- AI engineering
- Automation
- Product engineering
- Next.js
- React
- Vue
- Node.js
- TypeScript
- JavaScript
- Tailwind CSS
- Figma
- Webflow
Shipped, not shelved
I am a Senior Full Stack Developer & AI Engineer And here is my story...
It started with a Hello World Then websites, then mobile apps Then AI agents, and the automations that run them Now they help businesses grow And it still feels like that first commit
I started with clients I had never met, building whatever they needed. Then a crypto platform — forums, portfolios, live market data. A marketplace for the US, with commerce and jobs in one place. B2B commerce in New Zealand, and the work of making it fast. Internal systems for a company of eighteen thousand people. Now I lead the team behind AI platforms that 36 businesses run on.
Upwork
Freelance Web Developer
Aeterna Ecosystem
Full Stack Developer
Matchder
Full Stack Developer
Avant People
Full Stack Developer
SM Retail
Full Stack Developer
LiftFront
Lead Full Stack Developer & AI Engineer
Web development
I build websites, and the systems running underneath them.
- Next.js
- React
- Vue
- Angular
- TypeScript
- Node.js
- Express
- NestJS
- Django
- .NET
- Tailwind
Mobile development
I build the mobile apps that end up in your pocket.
- Flutter
- React Native
- Swift
- Kotlin
AI engineering
I build AI agents that do the work, not just the talking.
- TensorFlow
- OpenAI
- Gemini
- Agents
- RAG
- Automation
Cloud solutions
I ship it to the cloud, and I keep it running.
- Vercel
- Docker
- Railway
- Render
- Firebase
- PostgreSQL
- Redis
Cybersecurity
I secure the parts nobody notices until they fail.
- Auth
- Sessions
- Rate limiting
- OWASP
- Encryption
SEO
I tune pages for search, so people actually find them.
- Core Web Vitals
- SSR
- Structured data
- Sitemaps
- Analytics
UI/UX
I design it before I build it, so it is worth building.
- Figma
- Webflow
- Design systems
- Prototyping
- Accessibility
Custom solutions
When nothing off the shelf fits, I build something custom.
- CRM
- Dashboards
- Integrations
- Internal tools
- Workflows
I've been building for the web since high school. Freelance first, then startups — and the habit never changed: get it working, get it shipped, keep it running.
Most of my work is full-stack Next.js — the kind of product where the same person owns the schema, the API, the interface and the deploy. Recently that's meant a lot of AI surfaces: retrieval, generation, and the unglamorous plumbing that makes them dependable.
I care about the parts users never see — the loading state, the error copy, the thing that keeps working when the network doesn't. This site runs on a CMS I wrote for it.