Gonzalo and MassiProfile

Senior Software Engineer with 7+ years of experience across startups & corporate. VC-backed founder, and builder of systems that scale.

When I'm not coding, you'll find me kitesurfing, playing piano, zipping around Miami on my Vespa, hitting a tennis ball, or discovering the city's latest healthy foodie spots. I love staying active and balancing my career skills with an energetic lifestyle. Lately, I've been tinkering with AI workflows on my Raspberry Pi, experimenting with tools like PyTorch, Bedrock, Claude, and more. I have a super inclusive music taste and a healthy appetite for crypto and AI newsletters and podcasts.

What I'm Good At
JavaScriptTypeScriptReactNext.jsNode.jsNest.jsRuby on RailsPostgreSQLRedisGraphQLAWSHerokuVercelPostgresMongoDBElasticsearchWeb3.jsOpenAIDockerTailwindFigmaJestPlaywrightE2E TestingRegressions
Career

Professional Experience

A decade of building products across startups, agencies, corporations, and government—from founding companies to engineering at scale.

March 2026 - Presentfull-time

Lead Software Engineer

LeftMainREI

Serve as Lead Engineer building a next-generation Real Estate CRM / MLS platform for LeftMainREI, leading architecture and feature delivery from the ground up.

Design and implement robust infrastructure using AWS, Docker, and modular NodeJS/Next.js backend services.

Integrate proprietary and third-party real estate data streams, ensuring seamless and reliable data flow across MLS and CRM subsystems.

Drive adoption of modern engineering practices, including rigorous code reviews, automated testing (Jest, Playwright), and CI/CD pipelines.

Collaborate closely with product and executive stakeholders to deliver pixel-perfect UI components and scalable business workflows.

Next.js 16NodeJSAWSTypeSecriptPrismaPostgreSQLDockerE2E TestingRegression Testing
Dec 2024 - March 2026full-time

Software Engineer

Mass.gov, via Last Call Media

Building and maintaining the official MA State Government portal serving millions of users, implementing government-grade infrastructure as part of an awesome 9-member dev team.

Participating in all Scrum ceremonies (daily standups, sprint planning, refinement, reviews, and retrospectives) to ensure effective team collaboration and project delivery.

Writing robust code and conducting thorough code reviews to ensure highest quality standards.

Integrating various vendor APIs and ensuring seamless data flow across government systems.

Implementing comprehensive testing strategies using Jest, Playwright, and E2E/Regression testing.

Collaborating with design team using Figma to implement pixel-perfect UI components.

Next.js 15NestJSJestPlaywrightStorybookTypeScriptPrismaTailwindDockerAWSFigmaE2E TestingRegression Testing
Jun 2025 - Jul 2025contractor

Software Engineer (Full-Stack, Front-End Focus)

BusesForSale.com

Migrated the largest buses marketplace in the world ($250K MRR) from legacy PHP to Next.js/NestJS architecture as a fractional engineer.

Dramatically improved performance and developer velocity through modern stack implementation.

Implemented Algolia-powered intelligent search with advanced filtering for optimal vehicle discovery.

Built sophisticated recommendation system to enhance user experience and increase conversion rates.

Integrated OpenAI API for automated vehicle descriptions and intelligent categorization.

Optimized database queries and implemented Redis caching for high-traffic marketplace operations.

Collaborated with design team using Figma to support an ever-changing interface.

Next.jsNestJSTypeScriptReactTailwindAlgoliaPostgreSQLRedisFigmaOpenAI
Aug 2024 - Dec 2024contractor

Software Engineer (Full-Stack, AI/Back-End)

Momntum.ai

Built and deployed AI-powered chatbots automating salon bookings via WhatsApp and Instagram

Developed full-stack features using Rails, Stimulus, Docker, and Mailhog

Integrated ChatGPT and third-party APIs for messaging, scheduling, and client management

Delivered end-to-end automation workflows within an agile, Linear-managed environment

Focused on system reliability, performance, and seamless user experience across platforms

Ruby on RailsStimulusDockerMailhogChatGPT APIWhatsApp APIInstagram APILinear
Apr 2021 - June 2024full-time

Founder, Full-Stack Engineer

OpenBroker.com

Built an MVP and raised capital in 2021 at €3.2M valuation led by Sherry Ventures.

Next.js, Tailwind, Rails, deployed on Heroku, AWS, and Vercel.

Built an AI-first GraphQL-based API with property matching that powers 50+ real-estate websites.

Integrated OpenAI for automated property descriptions and market analysis, improving listing quality and engagement.

Built an ML model on Amazon Bedrock for personalized property recommendations based on user behavior.

Led a remote agile team from MVP to production.

Onboarded 300+ clients with zero-downtime and wrote great API docs.

Next.jsReactTailwindOpenAIOpenAI VisionGraphQLRuby on RailsStimulus JSPostgreSQLPostGISSidekiqAlgolia AIAWSMachine Learning
Jan 2018 - Jan 2020full-time

Co-Founder, Software Engineer (Full-Stack)

CleanHero Inc

Headless proptech solution automating home-rental operations, scheduling cleaners on auto-pilot.

Managed product development for both iOS and web applications, ensuring seamless user experience and functionality.

Recruited, hired, and trained fractional engineers fostering a skilled and efficient dev team

Achieved a successful exit demonstrating significant business impact & product scalability.

ReactSwiftRailsHerokuPostgreSQLSidekiqAirtable
Jan 2014 - Jan 2018full-time

Co-Founder, CEO

Supercharge Productions, Inc

Built Supercharge Productions Ltd. and grew it from working in Brooklyn coffee shops to establishing a reputable advertising firm on 5th Avenue, managing million-dollar budgets.

Led the agency in brokering content collaborations between influencers and brands, overseeing product development, marketing, client strategy, and P&L.

Defined product and go-to-market strategies for clients, fostering innovative and complex client products/services to meet B2C and B2B demands.

Identified new business opportunities for clients, driving growth and diversification.

Managed high-profile clients including Estée Lauder, Asos, Teva, Sephora, Amazon, FourSquare, Daniel Wellington, Furla, JetBlue, and others.

Scaled to over +$3 million USD revenue through company's lifespan before 2019 exit.

Media BuyingPaid MediaBrand PartnershipsDealroom managementContent Production
Work

Side Projects

Personal projects and experiments exploring Web3, AI, and innovative product concepts.

OpenComs OS® (2026) (OpenSource)
Featured Project

OpenComs OS® (2026) (OpenSource)

Built a fully local AI knowledge system that indexes personal documents (.pdf, .docx, .xlsx) and allows natural-language search and Q&A with complete privacy. Implemented a local Retrieval-Augmented Generation (RAG) pipeline: document parsing, chunking, ONNX-based embeddings, and vector search stored in SQLite.

ONNXOllamaLlama 3Local AImacOSFile System
View Project
Cadenza Miami

Cadenza Miami

Autonomous hotel booking engine with an AI chatbot handling guest communication, questions, and stay coordination for a luxury hotel.

Next.js · AWS Bedrock · Amazon LEX · ChatGPT
Sublet NY (2023)

Sublet NY (2023)

Built sublet platform for New Yorkers traveling for a minimum of one month using Next.js, TypeScript, Tailwind, and Ruby on Rails.

Next.js · TypeScript · React · Tailwind
The Lorenz System (Butterfly Effect)

The Lorenz System (Butterfly Effect)

The Butterfly Effect is a concept in chaos theory that describes how small changes in initial conditions can lead to vastly different outcomes in complex systems.

Ruby · Gnuplot
Ana's Cleaning Schedule

Ana's Cleaning Schedule

Vibecoded a live schedule that consumes an Airbnb iCal to notify my overseas housekeeper to refresh my apartment.

Next.js · Airbnb iCal API · Cron Jobs · WhatsApp API
Crypto Roulette (2024)

Crypto Roulette (2024)

Developed a decentralized & anonymous roulette application, enabling seamless Ethereum-based betting transactions through MetaMask integration.

MongoDB · Express.js · Next.js · Web3.js
WordPress Plugin

WordPress Plugin

A WordPress plugin that allows major themes (like Elementor) to pull houses from the OpenBroker MLS API and create No-code Real Estate Websites.

PHP · GraphQL · WordPress

Explore more projects and contributions on GitHub.

Impact

AWS Certified Cloud Practitioner

Certification Achieved

Earned the AWS Certified Cloud Practitioner credential, validating foundational cloud expertise and a deep understanding of AWS Cloud concepts, services, and security best practices.

View on Credly →

Charity: Water Initiative

Cambodia, 2016

Helped raise $50,000 to build a BioSand Filter in Kampong Thom, Cambodia, providing clean water to 15,000 people daily.

Liters Provided0
People Served Daily15,000
Learn more →