Hey, I'm Rafael Guiberteau — Junior blockchain engineer focused on Solidity, Foundry, and smart contract security.
I'm a Software Engineer from Spain, specializing in Blockchain, Smart Contracts, and Web3 Security.
My focus is on building real, production-grade blockchain systems — from Solidity smart contracts with Foundry to enterprise networks on Hyperledger Fabric.
I love creating things that live on-chain, understanding how protocols work under the hood, and improving every week through consistent building.
- Mastering Solidity & Foundry
- Deepening knowledge in smart contract security
- Creating a strong portfolio of Web3 projects
- Learning advanced blockchain architecture (DeFi, AMMs, oracles, staking…)
- Writing technical blockchain content (EasyBlockchain newsletter)
Blockchain & Smart Contracts
- Solidity, Foundry, Hardhat
- Hyperledger Fabric (Go chaincode, CA, peer/network config)
- Ethereum / EVM fundamentals
- Web3 concepts: ERC20, ERC721, staking, pools, oracles, gas, CEI pattern
Backend & Engineering
- Java (Spring Boot), Go, HTML, CSS
- REST APIs, microservices, DBs
- Docker, Linux, Git
Tools
- Foundry / Forge / Anvil
- VSCode + Solhint
- GitHub Projects
- Supabase
A secure ETH wallet supporting deposits, owner-restricted withdrawals, ownership transfer, events, and full Foundry unit test suite.
Designed following real audit patterns and CEI principles.
https://github.com/r4f4777/eth-wallet-foundry
A standard-compliant ERC-20 token implemented from scratch, without OpenZeppelin.
Designed to mirror production ERC-20 behavior used in DeFi protocols.
Includes full allowance mechanics, infinite allowance support, strict revert conditions, and a comprehensive Foundry test suite covering happy paths, reverts, and event emissions.
Focused on deeply understanding ERC-20 internals and real-world DeFi token behavior.
Built to be extended later with ERC-721, staking, and AMM logic.”
https://github.com/r4f4777/erc20-token-foundry
Bachelor thesis project.
A full blockchain donation system built using:
- Hyperledger Fabric
- Go chaincode
- Java Spring Boot API
- Angular front-end
Includes a complete Fabric network with peers, orderers, CAs, and real smart contract logic.
https://github.com/r4f4777/BCDonaciones
A university project built during my stay in Norway.
A Spring Boot + WebSockets application for real-time polls and votes.
https://github.com/r4f4777/FeedApp
I update GitHub weekly with new blockchain projects.
Here’s my current roadmap:
- ✔️ Wallet Contract (Solidity + Foundry)
- ✔️ ERC-20 Implementation (Solidity + Foundry)
- ⏭️ ERC-721 NFT Contract (Incoming) <-- Current focus
- Staking Contract
- Mini-DEX (AMM)
- Reentrancy Demo + Security Fix
- DAO Basic Version
- Hyperledger Fabric Network Example
- Full Web3 dApp (frontend + contracts)
My goal is to build the strongest junior-to-mid Web3 portfolio possible.
- LinkedIn: https://www.linkedin.com/in/rafael-guiberteau-tinoco-81689229b
- Newsletter: https://substack.com/@easyblockchain
- GitHub: You're already here 👀
“Subir la montaña cuesta, pero las vistas desde arriba siempre son mejores.” “Climbing the mountain is hard work, but the views from the top are always better.” I believe in long-term focus, building consistently, and understanding things with depth — not hype.
Every project here represents a step toward becoming a great blockchain engineer.
Thanks for stopping by — and if you're building something in Web3, feel free to reach out. 🚀