Implementation Engineer · AI Systems · Headless CMS
I build AI-augmented systems and production platforms that compress weeks of delivery into days, from content architecture and CMS implementation to deployed, maintainable software. Every side project comes with an honest label: what it is, what it's made of, and whether it's out yet.
About Sebastián
I am a full stack engineer based in Quito, Ecuador. I specialize in headless CMS platforms, Sitecore XM Cloud, Optimizely, Next.js, and composable architecture. I build the content model, the application layer, and the deployment path that turns the architecture into a working product.
My approach is to understand the constraint before writing the first line: what needs to be reliable, what needs to stay flexible, and where the integration boundaries are. The clean architecture and the fast delivery are usually the same solution.
The products I build on the side start from problems I could not solve with existing tools. Pathwise, Trainr, FocusLock, Forge, and Pantry Burn each answer a specific gap with a small, focused product. Some are live; the rest are labelled as still in the works.
What I build
Headless CMS implementations with content models, component contracts, GraphQL delivery, and publishing workflows that teams can maintain.
Headless CMS architecture →LINE 02Focused products with clear data models, practical billing or auth decisions, and frontends that stay simple after the first release.
SaaS and app projects →LINE 03Next.js and TypeScript systems for CMS-driven sites, product surfaces, internal tools, and the edges where content meets application logic.
Next.js CMS development →Side projects · live and in the works
A native macOS audiobook player that syncs MP3, M4A and M4B audiobooks with their EPUB on-device, so I can switch between my Kindle and the narration without losing my place. A Whispersync-style handoff without Audible.
Ingredients: Swift, SwiftUI, AVFoundation, SpeechAnalyzer, EPUB, FFmpeg
Web app for freelance personal trainers and CrossFit boxes. Weekly plans, per-exercise feedback from the client's phone, progress charts, payments, a public "find a trainer" page and a WOD of the day, in Spanish and English.
Ingredients: Next.js, TypeScript, Supabase, Postgres RLS, Tailwind, Playwright, FFmpeg
A local-first web app for recording dreams quickly, marking no-dream days, and reviewing patterns over time without accounts, cloud sync, or backend infrastructure.
Ingredients: React, Vite, TypeScript, Tailwind CSS, Dexie.js, IndexedDB, React Router, Vitest
A browser-based developer toolkit with privacy-first, client-side utilities for visual QA, local API mocking, text transforms, and in-browser background removal with deterministic mask editing.
Ingredients: React, TypeScript, Vite, React Router, Tailwind CSS
A personal operating system web app built around a single loop — Capture, Process, Plan, Execute, Review, Repeat — with a calm warm-toned design and a full feature set pulled from Notion and rebuilt from scratch.
Ingredients: Next.js 14, TypeScript, Supabase, Drizzle ORM, Tailwind CSS, shadcn/ui, TipTap, React Hook Form, Zod, Vercel
A minimal focus timer for iPhone that counts every time you leave the app mid-session, then turns that into a brutally honest score.
Ingredients: React Native, Expo, Expo Router, AsyncStorage, AppState API
A food-expiry tracker for iPhone that ranks what to use first, schedules local reminders, and stays focused on waste reduction instead of recipes.
Ingredients: React Native, Expo, Expo Router, AsyncStorage, Expo Notifications
A browser extension suite with five lightweight tools that run passively as you browse — tab time tracking, highlight saving, focus goals, inactive tab flagging, and price tracking.
Ingredients: WXT, React, TypeScript, Supabase, Lemon Squeezy
Safe-arrival notification app. Your trusted contacts get a quiet notification when you arrive or leave a place — so no one has to remember to send the "I got home safe" text.
Ingredients: React Native, Expo, TypeScript, Supabase, RevenueCat, EAS Build
AI-powered learning platform that builds a personalized week-by-week roadmap from a 5-question onboarding conversation.
Ingredients: Next.js, TypeScript, Supabase, Anthropic API, Lemon Squeezy, Railway, Vercel
Background
Full Stack Engineer · CMS platforms
4+ years in digital agencies building headless CMS platforms on Sitecore XM Cloud, Sitecore 10, Optimizely and Contentstack. Content architecture, Next.js and GraphQL component systems, multi-site setups with per-site theming, and tooling that automates component scaffolding. Speaker at Sitecore User Group Ecuador.
Founder / Engineer
End-to-end product engineering — Pathwise (AI learning platform), Trainr (coaching and client management), FocusLock and Pantry Burn (productivity utilities), and a multi-agent algorithmic trading system. TypeScript, Next.js, Supabase, Python.
Earlier
REST API development in Node.js and C#/.NET — schema design, database migrations, AWS deployments, and CI/CD pipelines. Container-based workflows with Docker and Linux systems fundamentals. Backend before the CMS work, which is why the architecture side comes naturally.
Master's in AI Applied to Business · UDLA Ecuador In progress
Graduate studies in applying artificial intelligence to business problems.
MSc Full Stack Web Development · UNIE - INESDI
Focused on modern web architectures, cloud deployment, and scalable full stack engineering practices.
Featured writing
Consulting
I'm open to consulting on headless CMS architecture, Sitecore XM Cloud, Optimizely, and Next.js: architecture reviews, implementation planning, and hands-on builds where product thinking and execution both matter.