I'm a software engineer, founder, teacher, and dad from Guam. I like taking complicated real-world workflows—payroll, restaurant ordering, live events, education, and media processing—and turning them into software people can depend on.
My core stack is Ruby on Rails, React, TypeScript, and PostgreSQL. I also work across Python/FastAPI, Go, React Native, SwiftUI, AI integrations, and the infrastructure needed to run products in production.
- Building and maintaining products through Shimizu Technology
- Growing Guam's developer community through Code School of Guam, which I founded
- Collaborating comfortably across distributed teams—Guam's UTC+10 time zone gives U.S. teams natural overnight coverage for deployments, maintenance, and incident follow-up
Before founding Shimizu Technology, I progressed from Junior Software Engineer to Software Engineer and Ruby Team Lead at Spectrio (Dec 2021-Jan 2025). Spectrio brought me back from Sep 2025-Feb 2026 for a six-month contract engagement leading critical modernization work across legacy Rails systems.
During that return engagement, I upgraded applications through Ruby 3.3.4 and Rails 7.2.3, modernized Webpack and CI/CD infrastructure, resolved Heroku and asset-pipeline compatibility issues, reduced one deployment slug by approximately 1.8 GB, and coordinated database migration and production rollout work. It is a good example of how I work: understand a risky legacy system, build a practical upgrade path, lead the team through it, and leave the production environment more stable and maintainable.
A Guam-native payroll and firm-operations system covering payroll calculation, approvals, check printing, pay stubs, tax reporting, adjustments, audit history, and role-based access. Built with Rails 8, React 19, TypeScript, and PostgreSQL.
The learning and operations hub behind Code School of Guam: curriculum, cohorts, lesson scheduling, progress, grading, student support, messaging, and mobile communication. Rails, React, React Native, Clerk, and PostgreSQL.
An AI-powered Chamorro language learning platform combining FastAPI, React, PostgreSQL, retrieval-augmented generation, language-content tooling, and model evaluation. Live at hafagpt.com.
A mobile recipe library that turns cooking videos, websites, photos, and handwritten family recipe cards into structured recipes. Built with FastAPI, React Native, Expo, PostgreSQL, AI extraction, OCR, and an iOS app.
The live multilingual platform for an international martial arts tournament series, with events, competitors, rankings, galleries, video, sponsors, admin workflows, analytics, and search. Rails, React, TypeScript, and PostgreSQL.
A Go, React, and SwiftUI product for video and audio transcription, PDF extraction, cited AI summaries, chat, background processing, collections, and webhooks. Try the web app.
- Make-A-Wish Guam & CNMI Events — registration, payments, check-in, live scoring, raffles, and event operations
- Håfa Code — an open-source, browser-based Ruby, JavaScript, Python, and web playground for students
Family comes first. I also love basketball, running, and building things that create more opportunity for people in Guam and the broader Pacific community.