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2nd place at the EAG Global Buildathon

· 2 min read
Andrei Sherikhov
Andrei Sherikhov
18 y/o dev from Colombia

on september 20, 2026, at the auditorio sidoc of universidad icesi in cali, they announced the winners of the EAG Global Buildathon — the ethcali builders tour stop — and i got 2nd place with Áureo.

25+ hackers, 13 projects, less than 48 hours. the track was application middleware & open-source tooling and the prize was 200 usdt paid on ethereum mainnet.

the project: aureo​

áureo is open-source ethereum middleware for risk and compliance. it watches corporate transfers registered on chain and evaluates them in real time with deterministic speed and volume rules. then it returns a risk verdict — high / medium / low — through cli, api and websocket, with the evidence auditable behind it.

short version: it is a camera in front of your building, not in front of the whole city. it only watches the contract you configure, and it tells you when something looks off.

how the weekend actually went​

  • friday night: repo, AureoCore.sol, hardhat + ignition, one contract with roles and a circuit breaker.
  • saturday: the backend ingesting logs over rpc, a 60s analysis window and the two deterministic rules (too many ops in a few blocks, absurd volume).
  • saturday night: websocket /stream, cli and the audit report. this is where sleep stopped being a priority.
  • sunday: docs, npm run docker:up so a judge could run the whole thing with one command, and a demo dapp to show the sdk live.

what i take from it​

honestly, the win was not the money. it was that the thing they clicked worked on their machine — no "clone it and pray" moment. everything was scripted: setup:env, docker:up, cli stream.

also: i'm 18 and i've been writing code since i was 7. seeing my name on that list next to people i follow was a strange, very good feeling.

official winners: ethcali.org/builders-tour/winners · project on devfolio: devfolio.co/projects/aureo-f338