Senior Blockchain Security Developer

OpenZeppelin

Senior Blockchain Security Developer for OpenZeppelin, focusing on the Contracts Library for Daml. Leading technical implementation and working with cross-functional teams on DeFi protocols.

Posted 5/21/2026full-timeRemote • 🌎 Anywhere in the WorldSeniorWebsite

About the role

Key responsibilities & impact

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

What you’ll need

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

Comp & perks

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 🚀

ATS Keywords

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Hard Skills & Tools

DamlUTXO-based protocol developmentDeFi engineeringAPI designcross-chain interoperabilitysecurity workflowsprivacy-preserving DeFicredential gatesmulti-party attestationcustody flows

Soft Skills

security-first mindsetclient-facing communicationautonomyproactivity