Gonzalo and MassiProfile

An engineer who thinks like a designer. 7+ years crafting digital products across startups, ventures, and the spaces in between, with an eye for the details that make all the difference.

Off-screen, you'll find me kitesurfing off the Miami coast, playing piano, riding my Vespa through Wynwood, or tracking down whatever restaurant everyone's whispering about. Music is a constant, genre-blind and always on. I move between worlds: code and creativity, structure and instinct, the technical and the tactile.

Craft & Medium
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

Leading the design and build of a next-generation real estate platform from the ground up, shaping the architecture, the interface, and every decision in between.

Working closely with product and executive stakeholders to make sure the experience is as considered as the engineering behind it.

Building infrastructure that handles complex real estate data streams invisibly, so the front-end stays clean and the user never feels the weight of it.

Instilling a culture of craft across the team: rigorous reviews, thorough testing, and a shared commitment to shipping work that holds up.

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

Software Engineer

Mass.gov, via Last Call Media

Part of a tight-knit team reshaping how millions of Massachusetts residents interact with their government online, building interfaces that are clear, trustworthy, and deeply human.

Collaborating with designers in Figma to translate complex government information into experiences that feel simple to navigate.

Writing code that has to earn its place. On a platform this visible, quality isn't optional.

Integrating third-party systems and data sources so that the public-facing experience stays seamless regardless of what's happening underneath.

Maintaining rigorous testing practices across a large, multi-team codebase used by millions of people daily.

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

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

BusesForSale.com

Reimagined the largest commercial vehicle marketplace in the world, transforming a slow, dated platform into a fluid, intuitive experience.

Brought a modern visual language and architecture to a product handling $250K in monthly transactions.

Built a smart search and discovery layer that surfaces the right vehicles based on what buyers are actually looking for, not just keyword matches.

Introduced automated vehicle descriptions that are accurate, consistent, and readable, removing the most tedious part of listing for sellers.

Worked closely with the design team to keep the interface evolving without breaking what already worked.

Next.jsNestJSTypeScriptReactTailwindAlgoliaPostgreSQLRedisFigmaOpenAI
Aug 2024 - Dec 2024contractor

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

Momntum.ai

Built the invisible layer that lets high-end salons communicate with their clients effortlessly. Automated booking flows that feel like natural conversation, not software.

Designed and shipped the full stack: the scheduling logic, the messaging integrations, and the client-facing experience.

Connected WhatsApp and Instagram into a single coherent workflow so salon teams could manage everything from one place.

Shipped fast in an agile environment without sacrificing the reliability that service businesses depend on.

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

Founder, Full-Stack Engineer

OpenBroker.com

Founded and built a property intelligence platform from scratch. Conceived the product, assembled the team, and took it from idea to a venture-backed business at €3.2M valuation.

Designed and shipped a data API that became the engine powering 50+ real estate websites across Spain. Other people's products running on something I built.

Integrated intelligent property descriptions and market analysis, lifting the quality of every listing on the platform.

Built a personalized recommendation layer that learned from user behavior to surface properties people actually wanted to see.

Led a distributed team from early prototype to production, hiring, shipping, onboarding 300+ clients, and keeping everything running without a gap.

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

Co-Founder, Software Engineer (Full-Stack)

CleanHero Inc

Built an orchestration system for home rentals that ran every property turnover on autopilot, cleaners scheduled, apartments refreshed, guests arriving to perfection.

Designed the product for both iOS and web, making sure the experience was as clean as the apartments it helped maintain.

Recruited and mentored a small team of fractional engineers, shaping the culture and quality bar from day one.

Achieved a successful exit.

ReactSwiftRailsHerokuPostgreSQLSidekiqAirtable
Jan 2014 - Jan 2018full-time

Co-Founder, CEO

Supercharge Productions, Inc

Founded and grew a content and brand partnership studio from a Brooklyn kitchen table to a 5th Avenue office, building the culture, the roster, and the reputation.

Orchestrated creative campaigns for some of the world's most recognizable brands: Estée Lauder, Sephora, JetBlue, Amazon, Furla, ASOS, and more.

Brokered collaborations between global brands and the creators shaping culture online, before that was a well-understood playbook.

Led the full picture: product, partnerships, client strategy, P&L, and the vision that tied it all together.

Scaled to over $3M in revenue before a 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)

A private knowledge system that lives entirely on your machine. Index your personal documents and speak to them in plain language. Built because some archives should stay yours. No cloud, no subscriptions, no data leaving the room. Just you and your files, with an intelligent layer between them.

ONNXOllamaLlama 3Local AImacOSFile System
View Project
Cadenza Miami

Cadenza Miami

Designed a seamless booking experience for a luxury Miami hotel, where the conversation between guest and property feels effortless and human.

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

Sublet NY (2023)

A curated sublet platform built for New Yorkers who leave for a month or more and want to trust who they leave their apartment to.

Next.js · TypeScript · React · Tailwind
Proving Benford's Law

Proving Benford's Law

An exploration of a strange mathematical truth: that in naturally occurring data, lower digits appear as the leading number far more often than chance would ever predict.

Ruby · Python · Solidity
The Lorenz System (Butterfly Effect)

The Lorenz System (Butterfly Effect)

A visual meditation on the butterfly effect: the idea that a single flap of wings in Brazil can set off a storm in Texas.

Ruby · Gnuplot
Ana's Cleaning Schedule

Ana's Cleaning Schedule

A quietly elegant system that runs an entire Airbnb turnover operation behind the scenes.

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

Crypto Roulette (2024)

A fully anonymous, borderless roulette experience where the house rules are written into the blockchain itself, not buried in fine print.

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

WordPress Plugin

A plugin that lets real estate agents build full property listing websites without writing a single line of code. Drag, drop, publish.

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 →