Remote opportunity at
OpenZeppelinSenior Blockchain Security Developer (Canton)
OpenZeppelin, known for open-source smart contract libraries, is hiring a Senior Blockchain Security Developer for its Secure Development team. The role is fully remote and joins…
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About This Role
OpenZeppelin, known for open-source smart contract libraries, is hiring a Senior Blockchain Security Developer for its Secure Development team. The role is fully remote and joins a 24-month engagement to build open-source DeFi foundations for the Canton Network, an institutional blockchain. The developer takes features of the Daml library through design, build and audit. Examples include timelocks, access control, vaults and token standard support. Other work includes designing and implementing…
Job Description
OpenZeppelin, known for open-source smart contract libraries, is hiring a Senior Blockchain Security Developer for its Secure Development team. The role is fully remote and joins a 24-month engagement to build open-source DeFi foundations for the Canton Network, an institutional blockchain.
The developer takes features of the Daml library through design, build and audit. Examples include timelocks, access control, vaults and token standard support. Other work includes designing and implementing parts of reference implementations for a privacy-preserving DEX, a lending product, cross-chain stablecoin settlement and a confidential auction launchpad. The developer also carries Daml ports of Canton improvement proposals forward, liaises with Digital Asset and ChainSafe, presents designs to partners, and collaborates with internal researchers on threat modeling, audit readiness and fixes.
AI is a daily tool for the team. Developers are expected to create and share agents, skills and workflows, and to return developer experience and security findings to the people maintaining the Canton protocol and related tooling. The posting asks for production Daml fluency, a working understanding of Canton architecture, at least three years building smart contracts in production, and real DeFi experience. A security-first mindset, an AI-native workflow, fluent English and a high degree of autonomy are also required.
The hiring process has four interview stages: a recruiter call, a manager interview, a team interview and a leadership interview, followed by a paid technical work trial. The company aims to reach an offer about 30 days after the first call.
Responsibilities
- Take library features all the way from design to audit
- Design and implement parts of reference implementations for DEX, lending, cross-chain settlement and auctions
- Implement Daml versions of Canton improvement proposals
- Coordinate specification work with Digital Asset and middleware alignment with ChainSafe
- Present and defend designs in technical discussions with partners
- Partner with the internal research group on threat modeling, readiness for audit and remediation
- Create agents and workflows the rest of the team can reuse
- Return DX and security findings to the protocol maintainers
Requirements
- Production Daml fluency, including templates, choices, signatories, observers and multi-party authorization
- Canton architecture knowledge, including synchronizers, privacy boundaries and token standards
- At least three years of production smart contract development, including UTXO or privacy-preserving architectures
- Production DeFi experience with AMMs, vaults, lending or cross-chain settlement
- A security-first mindset and the ability to find vulnerabilities in Daml code
- An AI-native workflow with tools such as Claude Code or Cursor
- Fluent client-facing English and high autonomy
Qualifications
- Cryptography or financial engineering background
- Work on compliance-driven designs in institutional finance
- Operating an SV node, Splice internals work, governance involvement or Canton Coin economics
- Production work with a cross-chain messaging protocol such as Chainlink CCIP, LayerZero, Wormhole or Axelar
- Experience building reusable, import-first developer libraries
- Use of AI in security work such as audit assistance, fuzzing or invariant analysis
- Work on non-EVM networks, for example Starknet, Soroban, Stylus, Aptos or Move
- Public code contributions to popular libraries
Core Skills
Benefits
- Fully remote work with flexible time off
- Eight weeks paid for primary caregivers, four for secondary, plus a lump-sum $3,600 bonus for new children
- Up to $500 toward home office equipment
- Medical insurance
- Monthly co-working stipend
- Learning and development opportunities
- Team meetups in various cities
Frequently Asked Questions
Answers are based only on the employer’s listing; where it doesn’t say, neither do we.
Is the role remote?
Yes, the posting describes the role as fully remote.
How long is the hiring process?
Expect a recruiter call, then manager, team and leadership interviews, followed by a paid technical trial. The company says it aims to decide within roughly a month of the first call.
Is a salary stated?
The posting does not specify a salary.
How do I apply?
The posting directs applicants to OpenZeppelin's official careers page, warning that third-party listings can be inaccurate. Candidates can also request interview accommodations.
Sample Interview Questions
AI-generated questions tailored to this specific role — a preview of the full practice set.