Arthur
Abeilice
Software Engineer
Latest Experience
Blockchain Consultant
Web3 consultant for digital assets: smart contract development (Solidity, Foundry/Hardhat), fiat-to-crypto integrations (PIX on‑ramps), account abstraction (ERC‑4337) and dApp architecture.
Open Source Developer
Four projects across smart contracts, dev tooling and blockchain research, with heavy emphasis on OpenZeppelin Contracts and security.
- Led the Hardhat Upgrades plugin migration v2→v3 (HH3) end-to-end, owning an unfamiliar codebase; shipped core, upgrades, foundry-upgrades with CI/CD.
- Added Solidity test support to foundry-upgrades; flagged missing cheatcodes to Nomic Foundation; designed an upgradeability pattern for GNO.lang.
- Built MASM modules (ownable, ownable-2-step, pausable), token-metadata extension and NFT architecture for Miden (Rust); 4 PRs merged.
Research & Development Engineer (Blockchain)
Go · cdk-erigon (Polygon zkEVM sequencer, Erigon/Geth fork) · sequencer ACL · txpool logging · testing tools · client support · docs
Solidity and Golang Software Engineer (Backend)
Development with Go for GraphQL APIs and ETL servers to index blockchain data. Also helped on documentation, tech interviews, and project management.
- Optimized GraphQL API, improving query response time by 90% via SQL tuning and caching.
- Built ETL servers to index on-chain data via contract/RPC interactions; worked directly with Geth.
- Developed smart contracts (tokens, NFTs, airdrop deployers, governance extensions) and published an NPM library; reviewed and fixed 3rd-party contracts.
- Improved authentication with Sign-In with Ethereum (SIWE); built internal tools for data backfilling, chain automation, and price analytics.
Software Engineer
Golang · REST micro-services · Kafka · GCP/Kubernetes · Vue.js/Nuxt · legacy Django
Junior Software Engineer
PHP · ShellScript · MongoDB · GUI/CLI DevOps tools · whitelabel automations · Vue.js · React-Native native modules · Android/iOS · PM assistant
Freelancing
- 1st: Web3 PIX on-ramper for digital assets on XMINE DEX.
- 2nd: NEXT.js role-gated web3 admin panel + Ponder indexing, for H3aven.
- 3rd: LLM workshop for Cyrela via Distrito IA: custom agents + harness patterns.
- 4th: Legaltech (WIP): Claude Code agents/skills + RAG drafting legal petitions.
- 5th: AI SaaS for construction procurement from blueprints (PDF, DXF, IFC).
• • •
About Me
- Econophysics models study 2017. Undergraduate Research with Leonardo S. Lima.
- 1st Place in StartUp Weekend Youth 2014 - BH
- Helped organize Work From Q ( event by Hetman’s )
- General & Chainlink Prizes at Ethereum São Paulo Hackathon 2022
- Entrepreneurship and Innovation, Summer Program in Boston College 2014
- Participated in Solidity workshop & bootcamp at EthereumRio 2022;
- Colégio Loyola Volunteering, Poverty Ailment 2013-2014
- Volunteer at Quartinho BH, a collective music-listening club (2026–present).
- Proficient with Photoshop, GIMP, Audacity, Inkscape, and Corel Draw, editing and design.
“If you don't know, the thing to do is not to get scared, but to learn.”