João Barbosa

Wiring bits to bring people together.

HereElsewhere
JuliaMikeEmiPietro CoppolaMychel

5 seeds planted. Plant yours

Growing
01
What I care about most is how people find each other: the right mentor, the right table, the right problem. Most of what I build is matching in disguise.
02
Vento
Founding Product Engineer. Voice agents that negotiate overdue debt in Brazil, where collectors get back 1-2% of what they chase. I interviewed owners, did product discovery backing the pivot, and built the outbound core the agent talks through under 900 ms a turn.
03
Google AlloyDB
Open-Source Contributor. Directly mentored by Google Engineers while building adbo, a command-line client for AlloyDB. (Google Cloud's managed, highly scalable PostgreSQL service).
04
Carnegie Mellon
Computer Science, class of 2029.
05
Rede Mulher Empreendedora
Tech Lead. Matching 900k+ women entrepreneurs to 200+ mentors, sub-second, 6× cheaper than an LLM per pair.
06
Next: deciding whom to call and what to offer before the phone rings.
Grown
01
XP Securities
A summer as quant dev on the credit desk in New York. I developed the screener that ranks 275 bond and CDS issuers on 21 features in two seconds instead of thirty minutes.
02
Jane Street FOCUS
Trading, low-latency systems, finance and SWE bootcamps.
03
Stanford TreeHacks
Agent swarm that takes a PRD and deploys the product, nobody at the keyboard. Agents run in parallel and will happily report that everything shipped.
04
iFood
Took down McDonald's delivery in Brazil for three hours. My change met one already in flight; I worked the rollback and still tell the story. Two years on the platform behind it, Latin America's biggest delivery app: 4M orders and 600M+ requests a day for 400 thousand restaurants. Owned the audit API partners hit 6,000 times a month, moved the read path onto Apache Ignite at sub-20 ms. McDonald's hasn't been down since.
05
Pandemica
1.2 million agents, within 5% of a city's three-year COVID death toll, in 2.5 minutes. Used by two cities. My honors thesis, and why I trust simulations a little and respect epidemics a lot.
06
Particles on Canvas
Led five friends turning CERN collision data into neural art. First place in Latin America out of five hundred teams.
Kept
01
Writing
My PasargadaeAugust 2026
02
Art from particle collisions:
neural art grown from kaon, electron, pionneural art grown from kaon, electron, pionneural art grown from proton, kaon, pion

Latest seed 6dba3e42, cmyk

Grow your own on this site
03
Lists of books, films, music, art, sayings and places. Take anything.
04
This site is my Pasárgada. Perder-se também é caminho.
05
Fundação Estudar
Tech Fellow, sixty of ~8,000.