Open for tereré
Hi, I'm
aka @galvarey · 🇵🇾 Asunción, Paraguay
> Full-Stack Developer
I build mobile apps, POS payment software and games, and run the backends behind them. I like shipping real products end to end, from the first commit to the app store.
Guillermo Alvarez
Full-Stack Developer · CTO at Happy Living
@galvarey
● Online
SC.01about me
I'm a full-stack developer working remotely from Asunción, Paraguay. I specialize in React Native, POS devices and EMV payments, and video game development, and I enjoy taking products from a blank repo all the way to production.
Today I build POS applications at ITTI. I'm also CTO of Happy Living, co-founder and CTO of Rebuscate, and I make games with Impossible Games, designing and building the infrastructure behind all of them. I also work on AI: orchestrating AI workflows and running our own embedding service for image and text search.
I've been working in tech since 2014, from IT support and teaching computer science to leading engineering, and I hold a degree in Computer Engineering from UTCD.
Away from the keyboard I tinker with electronics, design parts in Fusion 360 and Blender, and print them on FDM and resin printers. I also do penetration testing, which keeps the security side of my work sharp.
Lately I'm digging into machine learning, big data, payment processing and game design. Fun fact: I like turtles. 🐢
Code wizard at ITTI, Rebuscate, Happy Living and Impossible Games.
Focus
Languages
Currently learning
SC.02where I've lived
Born and raised in Misiones, I lived in Chile and Switzerland before settling in Asunción. Scroll to follow the route.
🇵🇾 San Miguel · Misiones, Paraguay
drag to spin
01 · Where it started
Misiones, Paraguay
I grew up in San Miguel, Misiones, a small town known as Paraguay's wool capital.
02 · 1.5 years
Santiago, Chile
First move abroad: a year and a half in La Granja, on the south side of Santiago, at the foot of the Andes.
03 · 3 months
Three months back home, just long enough to pack again.
04 · 5 years
Switzerland
Five years in Geneva, where I went to school and learned French. It's why I can work in three languages.
05 · Home again
San Miguel, Misiones, Paraguay
Back to where it started, with a new language and a lot of ideas.
06 · Today
Paraguay
Where I live and work today: building products, running my own servers and sharing tereré on hot afternoons.
SC.03hall of fame
1st place · 2025
ueno bank · itti
USD 30,000
Took the top prize among the 10 winning startups of Paraguay's Moonshot program, after four months of incubation, plus a trip to Silicon Valley for the winning teams.
Seed capital winner · 2025
MITIC Paraguay
USD 20,000
One of seven startups awarded seed capital at the 9th InnovandoPY Demo Day, the national startup program run by Paraguay's ICT ministry.
SC.04where I've worked
Earlier
Computer Engineering
UTCD
2015 – 2021
High-school diploma, Business Administration
Colegio Nacional "Don Laureano Romero Ortiz"
2014
SC.05things I've built
Product · Web / iOS / Android
Price comparison platform for local supermarkets, pharmacies and other stores in Paraguay, with AI-powered product matching and search, all running on our own infrastructure.
Product · iOS / Android
Building-management app for residents and administrators, with an AI assistant for reservations, backed by self-hosted Go microservices.
Client · Web / iOS / Android
Training platform for trail and mountain runners. Mobile rewrite and AWS-powered AI features.
Client · Web / iOS / Android
Mobile and web platform that streamlines loan requests from creation to analyst review. Client undisclosed.
Open source · Web / iOS / Android
Search or report online scammers and spammers. Web app plus a native companion.
Game · Web
Blockchain game with a holders leaderboard and player customization, rebuilt from scratch in two months.
Game
Card-based puzzle game where you move cars across grids. In development at Impossible Games.
SC.06toolbox
Languages
Frontend & Mobile
Backend & Data
Infrastructure & DevOps
Platform services
Games & 3D
AI & ML
Payments & Security
Hardware & Making
Design
Daily drivers: Windows 11 · Ubuntu · Kali · Android · iOS
SC.07playground
It's a real prompt. Ask it about my awards and projects, switch the site's color theme, or pour yourself another tereré.
psst: ↑ ↑ ↓ ↓ ← → ← → B A (try it more than once)
❯
SC.08 what's next?
I'm always open to questions, freelance projects and interesting problems, especially in mobile, payments or games. The fastest way to reach me is LinkedIn.