OpenZeppelin
Headquarters
London United Kingdom
About us
To accelerate the world's transition to an open financial system by securing blockchain applications and smart contracts.
Founded in 2015, OpenZeppelin has become the security standard for onchain finance, protecting over $35 trillion in digital assets through its open-source contract libraries. The company's Solidity and Cairo contracts power 9 of the top 10 stablecoins and 10 of the top 10 tokenized money market funds by market cap. Major institutions like DTCC, Fidelity, Coinbase, Uniswap, Aave, and the Ethereum Foundation rely on OpenZeppelin's combination of AI-native security tooling, deep research, and decade of audit expertise. The team of 140+ professionals operates fully remote across 20+ countries, defining industry standards while securing hundreds of billions in total value locked across major blockchain networks.
Products
The flagship OpenZeppelin Contracts library provides battle-tested smart contract components in Solidity and Cairo, used as the foundation for secure blockchain development. Security services include line-by-line smart contract audits, Zero-Knowledge Proof audits, and the Continuous Security Program for ongoing institutional compliance. Operational tools include Relayer for transaction management and secure key storage, Monitor for threat detection and automated response, and Contracts Wizard for interactive smart contract generation. Recent additions include Contracts MCP for AI-assisted coding and ecosystem-specific implementations for networks like Arbitrum Stylus.
Funding
OpenZeppelin has raised $37.4 million across three funding rounds since 2015. The company secured $14 million in December 2017, followed by $22.5 million in July 2021. Most recently, the Uniswap Foundation provided an $850,000 grant in October 2024. Investors include Northzone Ventures, BoxGroup, and IDEO CoLab Ventures. The company operates profitably through revenue from security audits and enterprise partnerships rather than relying primarily on venture financing.
Recent news
In May 2026, OpenZeppelin launched its new Continuous Security Program, a service designed to provide AI-powered security integration at the speed of development for onchain applications.
Technology
Core development uses Solidity for Ethereum smart contracts and Cairo for Starknet, with Daml for Canton network applications. Backend services leverage Rust for performance-critical components and TypeScript for tooling and APIs. Frontend applications use React with Radix UI and shadcn/ui for modern interfaces. Development workflows integrate Hardhat and Foundry frameworks, while security tooling includes Slither, Mythril, and Echidna for formal verification. The stack also incorporates functional programming languages like Haskell and Scala for institutional finance work.
Benefits
Fully remote work with no office requirement, supported by a $500 work-from-home equipment stipend and coworking space allowance. Flexible time off (unlimited holidays) and paid parental leave for both primary and secondary caregivers. Medical insurance coverage is fully covered, plus a monthly wellness allowance and annual Learning & Development budget covering technical training and language lessons. Regular company gatherings and retreats in different global locations help maintain team connections across the distributed workforce.