Full-Stack Engineer • AI-Native Systems • WordPress at Scale

Mario Miralles

Full-stack engineer based in South Florida building AI-native products and infrastructure — voice/RAG systems, backend services on Google Cloud, and automation platforms — on top of a foundation of 100+ production websites across 34+ industries.

100+
Sites Built
34+
Industries
SiteStaffr

Founder & Full-Stack Engineer • AI SaaS

SiteStaffr

What it is: An AI voice and text receptionist for WordPress sites — visitors speak or type naturally and get real answers, 24/7, in 57+ languages.

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What I built: A two-service architecture — a WordPress plugin talking to a Node/Express middleware on Google Cloud Run, which is the sole boundary to OpenAI's Realtime API (WebRTC voice) and a text chat path. Built a RAG pipeline from scratch — recursive chunking with a tuned overlap, hybrid cosine-similarity + keyword search — so answers are grounded in each site's own content. Stripe billing with a clear commercial-truth hierarchy, HMAC-signed service auth, and circuit breakers around the AI calls.

Process: GitHub Actions CI with nightly Playwright smoke tests against live staging, 50+ test files across both repos. I ran a self-initiated HIPAA/PHI audit on the system, found real gaps, and shipped remediation before any healthcare client went live on it. I also built my own multi-agent orchestration tooling — isolated git worktrees per agent, a Kanban task board, human-gated review — to help build and ship the product itself.

Node.js / Express Google Cloud Run OpenAI Realtime API RAG / Vector Search Stripe GitHub Actions CI
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Loria Medical

Healthcare • Long-Term Engagement

Loria Medical

What it is: I handle essentially all web development for this multi-site medical practice network — not a one-off build, an ongoing relationship spanning the public marketing site and a set of private, authenticated systems behind it.

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What I built: Beyond the SEO-optimized, procedure-focused marketing site that converts organic traffic into booked consultations, I've built a custom e-commerce system, private patient and physician portals, and internal resource libraries — real authenticated systems handling sensitive data, not just brochure pages.

Trust: Most of that work is intentionally kept out of public view — healthcare data handling means the details can't be shown here — which is exactly the kind of trust this client has placed in me as effectively their sole web developer over a long-standing engagement.

WordPress Healthcare Custom Portals E-Commerce
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Personal AI orchestration platform — Life dashboard

Personal Project • AI Infrastructure

Personal AI Orchestration Platform

What it is: A self-hosted personal productivity system, built from scratch as a real testbed for treating LLMs as infrastructure rather than just a coding assistant.

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What I built: A hand-rolled Python HTTP server (not a framework wrapper) with ~20 REST routes, input validation, and TLS handling engineered around real production failure modes I hit and fixed. Systemd-scheduled automation runs headless AI agents on a timer, with cost-aware model selection and graceful degradation when a budget cap is hit. On top of that, a structured multi-agent orchestration layer — agents run in parallel with typed, schema-validated outputs and get composed into pipelines, not just chained prompts.

Why it matters: No test suite, single-user by design — it's honestly a solo project, not production-hardened software. But it's the clearest evidence I have of backend systems engineering and LLM-infrastructure design done end-to-end, alone, with real documented bug fixes along the way.

Python REST APIs Multi-Agent Orchestration systemd Automation
OTDNews

Solo Project • Discontinued 2025

OTDNews

What it is: An automated AI news platform I built and ran solo for two and a half years — it turned Wikipedia's Current Events feed into a fully AI-written, AI-illustrated news site with zero manual publishing.

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What I built: AWS Lambda automation scraping Wikipedia's Current Events portal, enriched via the Brave Search API, then OpenAI-generated titles, content, and categories. Replicate's Flux model generated featured art for every story, with NSFW-detection and automatic retry logic. Everything auto-published to WordPress, archived across Google Sheets, Drive, and S3, and cross-posted to X with Cloudinary-generated social overlays — on a 4-window daily schedule (hourly, plus dedicated morning/evening/midnight passes) with Jaccard-similarity deduplication so the same story never posted twice.

Why it matters: Discontinued in late 2025 after ~2.5 years, but it's the clearest evidence I have of designing and running a fully automated, event-driven pipeline solo end to end — including the parts that don't show up in a demo: vendor evaluation, rate limits, retries, and content deduplication.

AWS Lambda OpenAI Replicate WordPress Publishing Automation Pipeline
About
Mario Miralles

I'm a full-stack engineer based in South Florida. My foundation is 100+ production websites built across healthcare, legal, home services, and tech — but my current work is building AI-native products: voice and RAG systems, backend services on Google Cloud, and automation platforms, using Claude Code as a core part of how I build.

I founded and run SiteStaffr, an AI voice/text receptionist SaaS, end-to-end — architecture, billing, security, and CI. I also run a digital-growth engagement for a healthcare client under my own LLC, owning scope and vendor decisions, not just execution.

Bilingual in English and Spanish, I work with diverse teams and clients to deliver results that drive real business growth.

Full-Stack Engineer AI Infrastructure 100+ Sites Built Bilingual EN/ES Claude Code
Mario Miralles

Frontend

React Next.js JavaScript HTML5 / CSS3 Sass DOM APIs Responsive Design

Backend

Node.js Python PHP Express MySQL SQLite Firebase / Firestore

WordPress

Custom Themes Elementor Plugin Development WooCommerce WP-CLI ACF JetEngine Rank Math Wordfence

AI & Automation

Claude Code OpenAI API OpenAI Realtime API RAG / Vector Search Embeddings AI Agents Multi-Agent Orchestration Prompt Engineering

Platform & DevOps

Google Cloud Run AWS S3 / Lambda Docker Stripe GitHub Actions CI Playwright Cloudflare HMAC Auth

SEO & Performance

SEO Page Speed Optimization Schema Markup / JSON-LD Lighthouse / PSI Google Analytics / GTM

Integrations & CRM

SendGrid Salesforce GoHighLevel Cal.com Twilio (SMS / A2P) Zoho Flow / Bigin

Tools

Git GitHub JIRA Figma Basecamp Canva

GitHub Activity

Let's Build
Something Together

Need a custom WordPress site, a plugin that solves a real problem, or a developer who ships fast with AI-powered tools? I'd love to hear about your project.

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