Solidity Developer

Hello,
My name's Walter, my academic background is in archaeology and collections management. Over the years, I've been developing my skills in blockchain and smart contract development for art and antiquities provenance security.

My company GeneSys Antica connects valuable ancient objects with their provenance documents through a smart contract, thus creating a durable, immutable and verifiable digital certificate of authenticity. This process secures ownership rights, transactions, royalties, and legal compliance for the global market in regard to EU Regulation 2019/880 and GDPR compliance.

Other skills:

Built a complete smart contract suite for a blockchain-based game on Monad, consisting of 10 Solidity contracts: a dual-token economy, a reward-claim system with ECDSA signature verification, a bidirectional token converter with daily rate-limiting, a staking mechanism, and four purpose-built NFT contracts (ERC-721 and ERC-1155) for characters, items, and crafting materials. Wrote and ran full test coverage using Hardhat (57 tests), including debugging of re-entrancy, authorization, and arithmetic bugs. Conducted a self-audit identifying signature-replay vulnerabilities. 

Skills: Solidity, Hardhat, OpenZeppelin (AccessControl, ERC-20/721/1155, ECDSA), Remix, smart contract testing & debugging, tokenomics implementation, gas optimization, EVM-compatible deployment (Monad Testnet).