Antonio Rapozo

Personal Projects

Side projects solving real problems

Problems I've encountered personally or through my network, turned into products with real users. Built during evenings (off-hours) and weekends, each project represents end-to-end ownership: identifying the opportunity, building (or leading) the technical solution, and shipping to production.

6 months Delivered December 2024 Acquired by e-commerce influencers for $30k+ USD

The Origin:

A close friend—one of South America's largest e-commerce influencers—shared how cash-on-delivery (COD) payment methods are severely under-supported in Shopify across Latin America. Most countries in the region rely heavily on COD, but Shopify's native support is limited, forcing merchants to use workarounds or lose customers at checkout.

What I Built:

  • Assembled and led 9-person engineering team (2 technical leads + 7 rotating developers)
  • Architected full-stack Shopify app supporting COD workflows
  • Integrated with regional payment processors and logistics providers
  • Built merchant dashboard for order management and COD tracking
  • Webhook system for real-time order status updates
  • Successfully deployed to production serving multiple high-volume merchants

Outcome: Three major e-commerce influencers partnered to acquire the application for $30,000+ USD in December 2024.

My Role: Technical leadership, architecture decisions, team coordination, development oversight, client communication, and product delivery.

React JavaScript Liquid Shopify API REST API Heroku AWS
Skills Demonstrated:
Technical Leadership Team Building E-commerce Development SaaS Architecture Problem Identification Product Development
Completed & Sold

Event Management Platform for Brazilian Entertainment Industry

$ Led 4 people
12 months Delivered March 2025 54 team members enrolled, pending production rollout

The Problem I Witnessed:

During COVID-19, I watched friends in Rio's entertainment industry shut down operations. The crisis revealed systemic technology gaps: manual processes, poor communication, and platforms that couldn't handle high-end event requirements in Brazil. Most critically, producers only knew if events were profitable days after they ended.

What I Built:

For Consumers:

  • Curated event discovery (AI-powered scraping filters quality events)
  • Clean interface replacing generic ticket platform chaos
For Producers:
  • Event management dashboard with AI assistance
  • VIP/special guest list tracking and coordination
  • Real-time analytics during events (not days later)
  • Customer LTV tracking across multiple events
  • Instant profitability visibility
  • Multi-role access (producers, promoters, operations staff)

Current Status: Delivered to event agency in Rio de Janeiro. 54 team members enrolled, pending production rollout as they transition from legacy systems.

Vue.js JavaScript Firebase OpenAI API REST API
Skills Demonstrated:
Problem Solving Industry Analysis Full-Stack Development Real-Time Systems AI Integration Stakeholder Management
Completed & Sold
Led 2-person team · 4 months Launched July 4, 2025 83 active users (free tier)

The Problem (My Own):

I had 47 browser tabs open. Notion nested 5 levels deep. Trello, Cold Turkey, RescueTime, Momentum, multiple calendar apps... I was managing my productivity system more than doing actual work. Context-switching between 8 apps to check what I should be doing wasn't optimization—it was theater.

What I Built:

Led a 2-person team to build one Chrome extension that replaced my entire productivity stack:

  • Distraction blocking while working
  • Goal and task tracking
  • Integrated calendar view
  • World clock for distributed team coordination
  • AI goal-alignment checker: Analyzes if daily work actually moves you toward stated goals

The AI component is the key differentiator—it's honest, sometimes uncomfortable, but it works. It tells you when you're busy but not productive.

Current Status: 83 active users on free tier, published on Chrome Web Store with freemium model. Learning about user acquisition for developer tools.

React JavaScript Chrome Extension APIs OpenAI API REST API
Skills Demonstrated:
Problem Identification Technical Leadership Chrome Extension Development AI/LLM Integration Product Launch
Completed & Active