Tobias González Arriola

I'm a full-stack developer based in Buenos Aires, specialised in integrating AI into products: assistants that act on real data through tool-use, agents, MCP servers, and layers that switch between Claude, OpenAI and Gemini without touching the code. I work end-to-end — web, mobile, desktop and automation — from the initial idea through to release. I care about clean interfaces, sound architecture, and shipping things that actually work.

Most of what follows is built solo, from the data model up. The rest is team work where I owned a slice worth naming — and I say which slice.

1. Full-stack developer

   Mar 2026 — Present

   DELSUD · Full-time · On-site

   La Plata, Buenos Aires, Argentina

   • Full-stack work on two of the company's products, from the database to the interface.
   • Public portal in Next.js with SSR/ISR, dynamic sitemaps and structured data; admin panel in React + Vite with a drag-and-drop page editor.
   • Shared component library used by both panel and portal, published as an npm package.
   • CMS & News Portal

     Multi-tenant headless CMS and high-performance news portal: one engine for every newspaper, with no per-site licence.

   • Construction-materials e-commerce

     Construction-materials marketplace: four independent services plus a delivery-route optimisation microservice.

2. Freelance full-stack developer

   Nov 2024 — Present

   Independent · Self-employed

   Remote

   • Building the whole product: understanding the client's problem and defining what solution it needs before any code — product design is part of the job, not a given.
   • End-to-end web and mobile applications with React Native/Expo, Next.js, Node.js and Firebase; modern, responsive interfaces.
   • Database design and server logic; integration of external APIs and services (payments, authentication, translation).
   • Deployment and operations: Google Cloud Run, Vercel, Firebase and Netlify, with performance work and maintenance of existing projects.
   • AI integration in the product: tool-use assistants over the client's data, a provider abstraction (Claude, OpenAI, Gemini), and AI in the development workflow itself.
   • Distributor Panel

     Management panel for a chemical distributor.

   • MultiBot

     AI assistant and CRM driven by chat.

   • Digital Catalog

     Multi-tenant B2B catalog and point of sale.

   • GestGym

     Gym management with hardware access control.

   • Copado

     Loyalty platform with tournaments and QR redemptions.

   • Sticker Editor

     Vector design editor for mobile and web.

Product

Understanding the client's problem before proposing a solution·Defining a product's scope and priorities·Product and experience design, not just implementation·Data modelling from scratch·Taking it to production: release, monitoring and maintenance

AI

Claude API / Anthropic SDK·OpenAI·Gemini / Vertex AI·Vercel AI SDK·Tool use / function calling·AI agents·MCP servers·Provider abstraction·Structured output (Zod)·AI in the dev workflow (Claude Code)

Web

Next.js (App Router, SSR/ISR)·React·TypeScript·Vite·TailwindCSS·SCSS Modules·Redux Toolkit·Three.js

Mobile

React Native·Expo·Expo Router·EAS Build & Submit·NativeWind·React Native Skia·Reanimated·Capacitor·Google AdMob·Play Store

Backend & data

Node.js·Express·Go·PostgreSQL·MongoDB·Redis·Firebase·Supabase·Sequelize·Prisma·WebSockets·LiveKit (WebRTC)·JWT·OAuth (PKCE)

SEO & performance

Structured data (JSON-LD)·Dynamic sitemaps·Canonical URLs·WebSub·ISR·Critical CSS·Code splitting·Core Web Vitals·Google Analytics / Search Console

Design

Figma·Design systems·Atomic Design·Design tokens·Motion & micro-interactions·Responsive & dark mode·Accessibility·Photoshop

Infrastructure

Google Cloud Run·Cloud Storage & Functions·Vercel·AWS S3 + CloudFront·Docker·Caddy·CI/CD·npm publishing

Open to freelance, contract and full-time work. If you're building something, I'd like to hear about it.