Modern websites
Astro · React · motion
Fast sites with motion, built to look great on any screen and rank on Google.
Martín
Espinosa
Web developer · Automation · AI
From code to product: websites, chatbots and systems that answer, book and get paid for your business.
What I work with
- Node.js
- PostgreSQL
- Redis
- SaaS
- PWA
- Claude · Gemini
- LLM
- RAG
- WordPress
- Astro
- React
- Tailwind
- GSAP
- Three.js
- Mercado Pago
- Stripe
- PayPal
- WhatsApp API
- n8n
- ARCA
- Google Workspace
- Microsoft 365
- MikroTik
// what I do
Expertise
Bookings & payments
Mercado Pago · Stripe · PayPal
Online booking, deposits, stores with a cart and payments that confirm themselves.
Automation & AI
WhatsApp · n8n · e-invoicing · AI
Bots, e-invoicing, collections and assistants that take over repetitive work.
Networks & ISPs
MikroTik · portal · monitoring
Network infrastructure, customer portal and automated billing and suspension.
SaaS platforms
Multi-tenant · plans · subscriptions
Products with per-customer accounts, plans with usage limits, recurring billing and an admin panel, built to scale.
Databases & backend
PostgreSQL · Redis · APIs
Data modeling, secure APIs, job queues, automated backups and encrypted sensitive data.
// lab
Try it
before you hire me.
Six things I build, working so you can use them: an AI assistant that books appointments, payments on several platforms, PDF documents, automations, a SaaS dashboard and integrations. The data is sample data: nothing is sent or charged.
Enter the lab →// projects
My
work
Platforms, AI assistants, automations, stores and sites with bookings and payments. Each project solves a specific business problem.
alhia.app
Featured project
Alhia
View projectFilter by////
Alhia
Platforms
AI-powered management system for businesses: bookings, e-invoicing, payments and WhatsApp in one dashboard.
paulasitjar.com
Stores & bookings
Online store, course sign-ups with limited seats and Mercado Pago checkout, with a custom admin panel.
Nexus Talento Humano
Websites
Website for a human resources consultancy: services for companies and candidates, spam-filtered contact form and local SEO.
Cauce
Websites
Agritech website: animated 3D field, scroll-driven sections and counters.
Tracción
Stores & bookings
Website for a tire center with a chat that books appointments, builds quotes and explains payment options, plus a 3D wheel, map and local SEO.
Órbita
Websites
Website for an AI consultancy: a 3D solar system where each service orbits the business, an interactive assessment and a page per service.
Alameda Propiedades
Websites
Website for a real estate agency: listings for sale and rent with visit booking, an AI chat that answers and books visits, and a tenant and owner portal with payments, receipts and statements.
Nácar
AI & automation
Website for a specialty coffee and tea house with WhatsApp orders handled by AI: tappable menu lists, photos, order with payment, location and a ready-for-pickup notice, plus the shop dashboard.
n8n automations
AI & automation
Three AI workflows you can watch run node by node: catering requests that quote themselves, inquiries routed to the right agent and PDF invoices that get logged and flagged before they are due.
Estudio Paz
AI & automation
AI assistant for an accounting firm that answers only from the firm’s documents, cites the exact passage behind every answer and learns from a new PDF on the spot.
Serrana
Stores & bookings
Online store for a linen clothing brand: stock per size and color, size guide and calculator, cart, coupons, shipping by postal code, installments and a brand dashboard with orders and low-stock alerts.
Grupo Molle
Platforms
Management dashboard for a distributor with three branches: sales, margin, collections, debt by age, sales reps against target and stock, with filters, customer drill-down and Excel and PDF export.
WhatsApp assistant
AI & automation
AI assistant for WhatsApp Business: customer support, property management with complaints and account balance, or sales with a catalog, photos and lead qualification. It hands the conversation to the team, who reply from a web inbox with the same number, and it is set up from a dashboard.
// about me
I build systems a business uses every day.
I'm Martín Espinosa, a developer based in Argentina working with clients across Latin America.
I've built everything from an internet provider's network to a SaaS platform with e-invoicing, payments and AI. I like to understand the problem before writing code.
I ship things that work, support them afterwards and answer when it matters.
// how I work
- 01
Discovery
I learn how your business runs and what you need solved.
- 02
First version in days
Something you can click through, not a document.
- 03
Iteration
We refine it together with real use.
- 04
Launch & support
It goes live, it works, and you know who to ask.
// contact
Available for new projects
Have a project in mind? Tell me what you need and I’ll get back to you by email.