Using his background in aircraft avionics software, Rex has specialized in quality and best practices on smart contract software. Starting from EthDenver 2018, Rex established secureth.org as a set of software development process guidelines. At the start of DeFi Summer (June 2020), Rex started
DeFiSafety to measure DeFi protocols on transparency, best practices and processes and implicitly safety. DeFiSafety has rated over 170 protocols on 7 chains and has become the pre-eminent independent source for technical ratings on DeFi protocols.