Senior Blockchain Security Developer

Job Description:

• Own the development of the OpenZeppelin Contracts Library for Daml end-to-end.
• Lead the technical design and implementation of the year-1 Reference Implementations.
• Implement and shepherd the OZ Daml versions of CIP-56, CIP-86, CIP-103, and CIP-104.
• Run client-facing roadmap, design, and milestone discussions.
• Collaborate with OpenZeppelin's auditors and security researchers on threat models.
• Use AI systems as core daily tools.
• Apply AI directly to security work and share what works back to the team.
• Contribute developer-experience and security feedback upstream into the Canton protocol.
• Conduct open-ended research around privacy-preserving DeFi.

Requirements:

• Production Daml fluency. You have shipped non-trivial Daml in production.
• 3+ years of experience in UTXO-based protocol development.
• 3+ years of experience on DeFi engineering in production.
• A security-first mindset. This is non-negotiable.
• Library / SDK API design taste. You've built reusable developer libraries.
• Cross-chain interoperability exposure. Production work with at least one major cross-chain messaging protocol.
• Institutional / compliance design fluency: You can design with credential gates, multi-party attestation, custody flows, and compliance hooks as native constraints.
• An AI-native workflow. Claude Code, Cursor, or equivalent is your daily driver.
• Experience applying AI to security work: You've already used AI in security workflows.
• Fluency in client-facing communication (English).
• Autonomy and proactivity.

Benefits:

• Company in-person gatherings in different locations around the world
• Fully remote work
• Flexible time off
• Paid parental leave
• One time work-from-home equipment stipend of up to $500 USD
• Medical insurance coverage
• Learning & Development opportunities
• Work with a global team in a fast-growing industry