Personal projects

Next.js 15 · Supabase · NVIDIA NIM · Recharts

WCAG 2.2 AA audit dashboard with three AI agents: a conversational one that answers questions about the findings, a classifier that categorizes them and a generator that builds the remediation backlog. Compliance metrics and historical tracking by campaign.

React 18 · Node.js · MongoDB · Socket.io · Stripe

Multi-tenant SaaS platform for project management with Kanban/Gantt views, real-time updates over WebSockets, built-in AI, automations, 2FA/TOTP and Stripe billing.

Next.js 15 · pgvector / Neon · RAG multi-modelo

Conversational assistant that answers questions about Civil Service procedures and regulations from a RAG knowledge base. It shares its foundation with the MAG chatbot: automatic failover across three AI providers to avoid single points of failure, and an admin panel with an audit log where uploaded documents join the knowledge base without manual retraining.

Next.js 15 · pgvector / Neon · RAG multi-modelo

The same foundation as the Civil Service chatbot with different content: it answers questions from Costa Rica's agricultural sector about MAG, SFE, SENASA, INTA and SEPSA, with quick access to hours, contacts and systems. Multi-model RAG with failover across three AI providers and an admin panel to upload documents.

Next.js 15 · Prisma 7 · Neon Postgres · NextAuth v5 · PWA

From one barbershop's booking site to a multi-tenant platform: each business gets its own subdomain, branding and schedule, self-service sign-up with a 14-day trial and a platform panel with an audit log. Bookings are validated in the business's time zone and never overlap thanks to a Postgres exclusion constraint; email and push reminders, rescheduling, time off and an offline PWA.

Next.js 15 · Prisma 6 · Neon Postgres · Hacienda v4.4

Point of sale and electronic invoicing for Costa Rica: invoices, receipts, credit and debit notes, quotes, accounts receivable and per-register closing. XML validated against Hacienda's official XSDs, sent from a queue with retries, credentials encrypted with AES-256-GCM and per-company isolation; CI runs migrations on an empty Postgres and more than 50 test files.

Next.js · Drizzle · Postgres (Supabase) · TOTP · Google Places

Bilingual ES/EN site with a category-based menu exportable to PDF, an editorial gallery, real Google reviews and WhatsApp reservations validated in Costa Rica time, which are logged in a panel to confirm or cancel them. Custom admin panel with two-factor authentication (TOTP), revocable sessions and attempt limits in Postgres. Audited in 2026: CSP without unsafe-eval, structured data, server-rendered images and 36 unused dependencies removed.

Next.js 16 · React 19 · Tailwind 4 · Neon Postgres · Resend

Website on its own domain for a Spanish school, in person in Costa Rica and online. The class catalog and its prices are read from Postgres (Neon) with a static fallback if the database fails; it includes four accommodation options for immersion and bookings that convert the schedule to the student's time zone. In development: an /admin panel with email code login so the client can edit video, figures, classes, prices and photos.