guilherme barradas · rio de janeiro

I break models
before you do.

AI quality engineer. Four years across backend, blockchain and evaluation of AI systems. Now I spend my days judging whether code is actually right, not just whether it runs.

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lvl 24

xor · warming up

About

I've duelled an alligator, taken a photo with Ronaldinho and scored at Maracanã. My mission is to destroy the world, but that's a secret, okay?

Started coding because of Minecraft. Still here. I care about the same question in every role: how do we know this works?

Inventory

testing

pypytest / unittestjuJUnit / Surefirevivitestgggoogletesthxtest harness designrvcode review

ai eval

evLLM evaluationrlRLHF preference datatragent trajectory analysisadadversarial promptsrbrubric designbmbenchmark construction

backend

goGotsTypeScript / NodepyPythonadAdonisJSgqGraphQLpgPostgreSQL

infra

dkDockerciGitHub Actions / GitLab CIlxLinuxpxProxmoxgfGrafana / ZabbixsolSolidity / Polygon

Projects

new · public alpha

GitShelters

An idle base-builder where your real GitHub pushes become Bytes that build a post-apocalyptic bunker. Your Forks work while you're away, get bitter when you stop committing, and every bunker is a dot on the map of the 404 Lands.

typescript · three.js · supabase · gitshelters.com ->

WEbdEX

Crypto arbitrage protocol on Polygon. As lead backend I moved the API from GraphQL to REST on AdonisJS so reads across many tables stopped being heavy, and built the Discord and Telegram servers plus their bots, both wired into the platform.

adonisjs · solidity · polygon · bots

gastei

Personal finance for Brazilian banks: imports OFX and Open Finance statements, categorizes with rules first and an LLM only for the ambiguous, and answers questions about your money in plain language. Hexagonal core; Claude or Gemini behind one adapter.

python · fastapi · streamlit · llm

HackATOM 01

Hackathon I created and ran at Atom Smart Chains: port WEbdEX's Solidity contracts from Polygon to Solana with Rust and Anchor. Two editions, 15+ talks, many competing teams, and 7 participants hired onto the team.

solidity · solana · hackathon

this site

Go + templ + htmx, one static binary, no framework on the client. Press F3.

go · templ · sse

Work

2024 → now: AI Quality Engineer · Scale AI
Build containerized test environments and adversarial tasks to evaluate AI coding agents. Promoted to reviewer.
2026: AI Quality Engineer (Anthropic project) · Alignerr
Evaluate coding-agent transcripts on real open-source tasks; produce preference data for training.
2025 → 2026: Lead Backend Developer · Atom Smart Chains
Led backend of a crypto arbitrage protocol on Polygon. Node/AdonisJS, Solidity, Docker, CI/CD.
2022 → 2023: Fullstack Developer Trainee · NTL Nova Tecnologia
ERP systems in PHP. Where the addiction started.

Contact

Open to remote roles with US and European teams.

guilhermebarradasdev@gmail.com linkedin github