Available for freelance & contracts · Remote worldwide

Miguel
Maldonado

I help founders and product teams turn complex ideas into scalable SaaS platforms and high-converting e-commerce systems — without the technical debt that kills growth.

React / Next.js Node.js / NestJS Shopify / WooCommerce Supabase · PostgreSQL · MongoDB ETL Pipelines AI Integrations Vercel · Docker · CI/CD
Hire me View experience LinkedIn
20+
Years of experience
60+
E-commerce stores
B2
English (CEFR B2)
About me

I build things
that scale.

Senior Full Stack Engineer with 20+ years delivering production software across Latin America, Europe, and the US — working at every layer of the stack: from architecting multi-tenant backends to optimizing checkout flows that move real revenue.

My focus is TypeScript-first engineering — React, Next.js, Node.js, NestJS — backed by solid data layers (PostgreSQL, MongoDB, Redis) and deployed through Dockerized CI/CD pipelines on AWS, DigitalOcean, and Vercel.

Whether you're a founder validating an MVP, a CTO scaling a platform, or a brand outgrowing your current stack — I can help you move fast without breaking things.

SaaS & Product Engineering

Multi-tenant architectures, subscription & billing, RBAC/auth (OAuth, JWT), admin dashboards, and API-driven backends built to scale.

E-commerce specialist

60+ active stores on Shopify, WooCommerce, Magento, PrestaShop. Headless commerce, payment gateways, checkout optimization, Core Web Vitals.

Data Engineering & ETL

1M+ property records processed. Pipeline design, MongoDB optimization, geospatial queries, automated dashboards, DigitalOcean infrastructure.

Systems Integration

CRM/ERP connections, middleware layers, inventory & logistics sync, business automation — making your systems talk to each other.

Tech stack

Core skills

Frontend

ReactNext.jsTypeScriptJavaScriptTailwind CSSHTML5CSS3

Backend

Node.jsNestJSPHPLaravelSymfonyREST APIsGraphQL

Databases

PostgreSQLSupabaseMongoDBMySQLRedis

Cloud & DevOps

VercelAWSDigitalOceanDockerCI/CDGitHub Actions

E-commerce

ShopifyWooCommerceMagentoPrestaShopHeadlessStripeRedsys

AI & Data

OpenAI APILLM integrationsETL pipelinesMongoDB ingestionDashboards
Work history

Experience

Jan 2010 — Present
16 years
Grupo Hostienda
Barcelona · Remote
Senior Web Developer
Long-term agency partnership focused exclusively on e-commerce clients in Spain and Latin America. Runs in parallel with independent freelance engagements (see Self-Employed).
Led development of 60+ active e-commerce stores on Shopify, WooCommerce, Magento, and headless architectures
Built high-performance storefronts handling thousands of monthly transactions, focused on speed, conversion, and uptime
Integrated payment gateways (Stripe, PayPal, Redsys, regional PSPs), shipping providers, and third-party REST APIs
Led performance audits and SEO initiatives, consistently improving Core Web Vitals and organic visibility
Managed cloud deployments on AWS and DigitalOcean with Docker-based environments and CI/CD pipelines
ShopifyWooCommerceMagentoReactNext.jsPHP/LaravelNode.jsPostgreSQLDockerAWS
Sep 2019 — May 2025
5 years 9 months
8020REI
Miami, FL · Remote
Full Stack Developer & Data Engineer
Built and scaled a real estate data platform managing the full data lifecycle across millions of property records.
Designed and maintained ETL pipelines processing 1M+ U.S. property records with deduplication and enrichment at scale
Architected MongoDB databases optimized for high-volume reads and complex geospatial queries
Developed custom Buybox app for property targeting, deal flow filtering, and acquisition opportunity identification in real time
Built automated reporting dashboards providing data-driven insights for investment decisions
Owned the full technical roadmap from architecture to deployment, collaborating directly with the founding team
Node.jsMongoDBETLDigitalOceanDockerREST APIs
Jan 2010 — Present
16 years
Self-Employed
Bogotá · Remote worldwide
Freelance Full Stack Developer
Independent consulting delivering end-to-end web solutions for startups, SMEs, and agencies across Colombia, Venezuela, Spain, and the US. Concurrent with the Grupo Hostienda engagement since 2010.
Partnered with founders to define technical scope, choose the right stack, and ship working products — avoiding overengineering
Built custom SaaS platforms and web apps using React, Next.js, Node.js, and PHP from architecture through deployment
Launched e-commerce stores on Shopify, WooCommerce, and PrestaShop with custom themes, plugins, and integrations
Designed B2B integrations connecting CRMs, ERPs, billing systems, and logistics providers via REST APIs
ReactNext.jsNestJSPHP/LaravelShopifyPostgreSQLMongoDBVercel
Jan 2010 — Nov 2014
FonaxTM
Miami, FL
Senior Developer
Built CRM platforms and support systems handling customer lifecycle, ticketing, and billing workflows
Developed payment gateway solutions for subscription and usage-based billing
Designed GUI interfaces for PBX and VoIP systems
PHPMySQLCRMPayment GatewaysPBX/VoIP
What I offer

Freelance services

01

SaaS Development

Full-cycle builds from MVP to scale. Multi-tenant architecture, auth & RBAC, billing, dashboards, and API-driven backends.

02

E-commerce solutions

Shopify, WooCommerce, Magento, PrestaShop. Custom plugins, headless builds, payment integrations, Core Web Vitals optimization.

03

Data Engineering & ETL

Pipeline design and management, MongoDB ingestion at scale, automated reports and dashboards. Real estate data specialty.

04

AI Integrations

OpenAI API, LLM-powered features, and workflow automation built into your existing or new applications.

05

Systems Integration

CRM/ERP connections, middleware development, B2B API integrations, inventory & logistics sync, and business automation.

06

Technical Consulting

Architecture review, stack decisions, legacy modernization, code audits, performance optimization, and CTO-as-a-service.

Selected work

Portfolio

Real estate · Data engineering

8020REI Data Platform

ETL pipelines processing 1M+ U.S. property records, geospatial MongoDB architecture, Buybox targeting app, and investment dashboards for a Miami-based real estate firm.

Node.jsMongoDBETLDigitalOceanDocker
Discuss this projectLinkedIn
E-commerce · Spain / LatAm

60+ E-commerce Stores

Led development and optimization of 60+ active stores for Grupo Hostienda clients — Shopify, Magento, WooCommerce, headless architectures, and Redsys payment integration.

ShopifyMagentoNext.jsStripeRedsys
Discuss this projectLinkedIn
SaaS · Multi-tenant

Custom SaaS Platforms

Multi-tenant SaaS platforms with RBAC, subscription billing, admin dashboards, and REST APIs — from MVP validation to production launch.

ReactNestJSPostgreSQLSupabaseJWT
Discuss this projectLinkedIn
Telecom · Enterprise

FonaxTM CRM & Billing

Complete CRM, support, billing, and payment gateway platform for a US telecom/VoIP company — including PBX GUI interfaces and subscription billing.

PHPMySQLPayment APIsPBX/VoIP
Discuss this project (NDA)LinkedIn
Freelance · AI integrations

AI-Powered Web Apps

LLM-integrated applications automating internal workflows, content pipelines, and customer-facing features using OpenAI APIs on Vercel + Supabase stacks.

OpenAINext.jsSupabaseVercel
Discuss this projectLinkedIn

50+ more projects across
Colombia, Spain, Venezuela & the US

Let's talk about yours
Get in touch

Let's build
something great.

@
in
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PORTFOLIO

migue.net
☎

PHONE / WHATSAPP

+57 301 555 4045
📍

LOCATION

Bogotá, Colombia · Remote worldwide

Open to freelance & fixed-term contracts

Looking for a senior developer to build your SaaS, e-commerce platform, data pipeline, or AI-powered app? I work with founders, CTOs, and product teams — remote-first, globally.

Send me a message Connect on LinkedIn