$ whoami
Full-stack engineer crafting FinTech platforms, AI products, Web3 apps, and mobile experiences end to end. From Rails & Node backends to Vue & React Native frontends.
// featured
A real South Florida transportation company I helped scale with technology. WAYS runs airport and cruise-port shuttles across Miami, Fort Lauderdale and West Palm Beach with a fleet from 1 to 55+ seats. I built their booking and dispatch platform: a Rails API, an admin dispatch dashboard, a customer booking app and a TV kiosk, with Stripe payments and audited records.
Full-stack payments platform issuing dual-provider virtual cards (USD & MXN) with topups, transfers, FX, invoicing and a real-time admin dashboard.
Multi-platform currency converter for 500+ crypto & fiat assets with live rates, premium tiers and native iOS, Android and Chrome builds.
AI app that generates interactive stories in 11 languages with tap-to-translate gameplay, powered by GPT-4o and DeepL.
Snap a photo of any page and hear it read aloud with karaoke-style word-level highlighting. OCR → TTS → synced playback.
Real-time DeFi liquidity-pool tracker for Uniswap & PancakeSwap with impermanent-loss math, crypto billing and a Chrome extension.
Beautiful real-time Kanban board with drag-and-drop columns, image attachments and Firebase sync. "Dark Forge" theming.
Luxury NFT marketplace on Binance Smart Chain backing physical perfume with on-chain certificates and tiered membership.
White-label unified-communications platform: WhatsApp, VoIP via Asterisk, and sub-second AI voice agents in a 3-tier reseller model.
// the full archive
A cross-section of products spanning payments, AI, blockchain, mobile and developer tooling. Filter by domain.
A real South Florida transportation company I helped scale with technology. WAYS runs airport and cruise-port shuttles across Miami, Fort Lauderdale and West Palm Beach with a fleet from 1 to 55+ seats. I built their booking and dispatch platform: a Rails API, an admin dispatch dashboard, a customer booking app and a TV kiosk, with Stripe payments and audited records.
Full-stack payments platform issuing dual-provider virtual cards (USD & MXN) with topups, transfers, FX, invoicing and a real-time admin dashboard.
Multi-platform currency converter for 500+ crypto & fiat assets with live rates, premium tiers and native iOS, Android and Chrome builds.
AI app that generates interactive stories in 11 languages with tap-to-translate gameplay, powered by GPT-4o and DeepL.
Snap a photo of any page and hear it read aloud with karaoke-style word-level highlighting. OCR → TTS → synced playback.
Real-time DeFi liquidity-pool tracker for Uniswap & PancakeSwap with impermanent-loss math, crypto billing and a Chrome extension.
Beautiful real-time Kanban board with drag-and-drop columns, image attachments and Firebase sync. "Dark Forge" theming.
Luxury NFT marketplace on Binance Smart Chain backing physical perfume with on-chain certificates and tiered membership.
White-label unified-communications platform: WhatsApp, VoIP via Asterisk, and sub-second AI voice agents in a 3-tier reseller model.
Free online JSON diff & comparison tool with deep-nesting support, live validation and a cyberpunk UI. Shipped & live.
Scan-to-order platform: diners scan a table QR, browse a live menu and order in real time. Firebase-first, zero middle tier.
Designed and built the full site for this Boca Raton sourdough bakery, then re-engineered its local SEO and AI-search (GEO) footprint: Bakery JSON-LD, llms.txt, FAQ blocks and long-form guides that lifted AI citability from 8 to 42 and turn "sourdough near me" searches into organic delivery orders.
Shadow-matching puzzle game for toddlers: 40+ levels, 4 art packs, bilingual TTS, haptics and native iOS/Android releases.
Sky-dodging arcade game with AI-generated sprite art, progressive difficulty and touch-first controls for young players.
Cross-platform photo backup that syncs to AWS S3 in the background, with local galleries, analytics and subscription billing.
// toolchain
Ruby on Rails
Node.js / Fastify
Python / FastAPI
PostgreSQL · MySQL
Redis · Sidekiq · BullMQ
Vue 2 / Vue 3
React · Next.js 15
Tailwind CSS
Vuetify · shadcn/ui
ApexCharts · D3 · Three.js
React Native · Expo
Capacitor · Cordova
RevenueCat (IAP)
Firebase / Firestore
ElevenLabs · DeepL
Web3.js · TronWeb · Thirdweb
AWS · Docker · Nginx
Stripe · Block.io
// about
I'm Mario Diaz, a full-stack engineer who lives across the whole stack: designing Ruby on Rails and Node APIs, architecting PostgreSQL data models and Sidekiq job queues, and shipping polished Vue and React Native frontends to the App Store and the web.
My focus is FinTech and AI: virtual-card platforms, crypto payment rails, DeFi analytics, multi-tenant SaaS, and AI-powered consumer apps. I've integrated Stripe, blockchain networks (ETH / BSC / TRON), OpenAI, Whisper, ElevenLabs, RevenueCat, Firebase and AWS into real, paying products.
I care about products that actually launch: clean architecture, real-time systems, and interfaces that feel fast and considered.
const mario = { role: "Full-Stack Engineer", builds: ["FinTech", "AI", "Web3", "Mobile"], backend: ["Rails", "Node", "Postgres", "Redis"], frontend: ["Vue", "React Native", "Next"], cloud: ["AWS", "Docker", "Firebase"], status: "available", ship: () => true, };
// let's talk
Recruiters, founders, and teams: I'm open to freelance projects and full-time roles. Let's make it real.