Full stack engineer with 7+ years taking web and mobile products from idea to production, focused on AI: LLM agents, MCP servers, and RAG on top of multi-tenant SaaS. I ship with TypeScript, React/Next.js, React Native and Flutter over Node, Python and Postgres/Firebase, on AWS, GCP and self-hosted infrastructure.
What I'm good at: product execution, API and data design, and shipping measurable things rather than demos.
- 🌎 Remote, relocating to Spain. Available for US or European hours
- 🗣️ English C1 · Spanish native
- ✍️ I write at guille.tech/blog
| Role | Where | When |
|---|---|---|
| Lead Developer & Solutions Architect | DataMission: multi-tenant government 311 / CRM platform | 2024 – present |
| Lead Full Stack Developer & AI Solutions Architect | Roraima Devs: AI tooling, BI dashboards, e-commerce; Front End Lead for a Web3 analytics client | 2021 – 2025 |
| Front End Development Lead | Villa de Marcos: direct-booking site + WhatsApp LLM bot for a luxury villa in Tenerife | 2024 |
| Full Stack WordPress Developer | Oxoft: 15+ client sites, custom LATAM payment plugin | 2019 – 2021 |
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Residents file requests through a portal, chatbot, SMS or Open311; municipal staff triage and resolve them in a back office. One Next.js 16 deployment serves every municipality by host. There's an MCP server with 130+ tools for LLM agents, and the AI chatbot is built to WCAG 2.1 AA / Section 508. Next.js 16 Firebase Cloud Run Stripe MCP
datamission.ai |
A solo-built product on Google Play: a React Native/Expo app plus a PWA that share one monorepo core. It has an AI coach over an MCP server (~90 tools) with photo-based calorie counting, live GPS cardio on MapLibre, Android widgets and offline-first writes. React Native Expo PocketBase MCP
web · Google Play · repo |
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An open-source LMS where every school gets its own subdomain, branding and payment rails, isolated with Postgres Row Level Security. It includes AI exam grading, FSRS spaced repetition, and an MCP tutor that respects each student's RLS scope. Accepted into the Google Gemini API Developer Competition. Next.js Supabase Stripe Connect Solana MCP
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Replaces the daily standup: an agent reads each developer's GitHub activity and drafts their update from evidence in Slack or Discord. Each org picks its model (OpenAI, Anthropic, Google), and the app can also ingest meeting notes. Next.js 16 Vercel AI SDK Slack Discord
standup.guille.tech |
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An open-source GitHub Action that finds duplicate issues using embeddings, pgvector (HNSW) and an LLM judge, auto-labels them, and resists prompt injection. GitHub Actions pgvector LLM
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11 open-source skills for Claude Code that take an issue all the way to a merged PR: plan, implement, capture visual evidence, open the PR, and follow review. Most ship with trigger evals. Claude Code Agent Skills Hooks GitHub API
repo |
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A Flutter marketplace for iOS, Android and web on an event-sourced Firebase backend. Gemini vision drafts a listing from a photo, and Stripe Connect handles split payments, escrow, refunds and disputes. Flutter Firebase Gemini Stripe Connect
spurtsports.com |
A price comparison tool for Venezuela that reached 10,000+ users in its first week. It scrapes 10k+ prices a day from 5+ sources and has a WhatsApp assistant that answers price questions in plain language using RAG. Next.js Python Postgres Pinecone
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| Area | Tools |
|---|---|
| Languages | TypeScript, JavaScript, Python, Dart, PHP, SQL |
| Frontend & mobile | React, Next.js, React Native, Expo, Flutter, Vue, Angular, React Query, PWA |
| Backend | Node.js, Express, Nest.js, FastAPI, Flask, REST, GraphQL, Socket.IO, n8n |
| AI / LLM | Claude API, OpenAI, Gemini, Vercel AI SDK, MCP servers, RAG, LangChain, pgvector, Pinecone |
| AI engineering | Claude Code, Codex, Agent Skills, agent pipelines, evals |
| Data | PostgreSQL (RLS), Supabase, Firestore, PocketBase, MySQL, MongoDB, Redis |
| Cloud & DevOps | GCP (Firebase, Cloud Run, Pub/Sub), AWS (S3, EC2, Amplify), Vercel, Docker, Dokploy, GitHub Actions |
| Quality | Playwright, Vitest, security-rules tests, WCAG 2.1 AA / Section 508 |
I'm open to senior full stack / AI engineering roles (remote, US or EU hours) and to freelance product work. The best way to reach me is through guille.tech or LinkedIn.