OpenZeppelin seeks a Lead Blockchain Security Developer for a multi-year Canton engagement. Responsibilities include owning the OpenZeppelin Contracts Library for Daml, leading technical design and implementation of year‑1 Reference Implementations (privacy-preserving DEX, lending, cross-chain stablecoin settlement, confidential auction launchpad), coordinating with Digital Asset and ChainSafe, and collaborating with auditors. Requirements include production Daml fluency, 3+ years UTXO-based protocol development, 3+ years DeFi engineering, demonstrable security/auditing experience, library/SDK API design experience, cross-chain interoperability exposure, and an AI-native workflow.