Senior Web Developer (Contractor)

About the role

OpenZeppelin is the security standard onchain finance is built on. Founded in 2015, our mission is to accelerate the world's transition to an open financial system, built on open standards and secured by rigorous research. Our open-source Contract Libraries have facilitated over $35 trillion in onchain value and are used by 10 of the top 10 tokenized money market funds and 9 of the top 10 stablecoins by market cap. We combine AI-native security tooling with deep research and a decade of audit expertise to support leading institutions and crypto-native teams shaping the next generation of digital assets like DTCC, Fidelity, Coinbase, Uniswap, Aave, the Ethereum Foundation, and many more across the full secure development lifecycle. Please note: Always refer to OpenZeppelin's official job page for the most accurate information about our open roles, as we have seen multiple third party job sites posting inaccurate information. The Marketing Team The Marketing Team at OpenZeppelin drives awareness and adoption across every product and service we ship, from the flagship OpenZeppelin Contracts Libraries to open source development tooling like Relayers and Monitor and Financial Institutions services. Working hand-in-hand with Product, Design, Sales, and Open Source Engineering, the team owns messaging, go-to-market strategy, content, and events that position OpenZeppelin as the standard for blockchain development.

Responsibilities

• Location:
• OpenZeppelin is a fully remote organization, however candidates for this position must be located within UTC-6 to UTC+2 time zones.
• You will
• Lead the end-to-end CMS migration from HubSpot to Sanity + Next.js, including content modeling, schema architecture, content migration, URL preservation, redirects, and SEO continuity.
• Design and build a comprehensive library of reusable, design-approved components in collaboration with the Brand team, enabling the Marketing team to publish pages autonomously after migration.
• Integrate HubSpot CRM (forms, lead capture, tracking) and GA4 analytics into the new stack so Sales and Marketing keep everything they rely on today.
• Set up the Claude Code + Sanity MCP integration, configure access and permissions, and train the Marketing and Brand teams to operate the website through natural language commands to Claude.
• Implement technical SEO and AIO optimization through schema markup, structured data, Core Web Vitals improvements, and content structures optimized for AI-driven discovery.
• Manage the underlying website infrastructure including CI/CD pipelines, staging environments, hosting (Vercel or similar), and monitoring to ensure reliability and fast iteration cycles.
• Build interactive elements where needed (live stats dashboards, embedded tools, custom landing page experiences) that reflect OpenZeppelin's identity as a leading technology and security company.
• Document architecture, workflows, and team-facing processes thoroughly so OpenZeppelin is genuinely self-sufficient at the end of the engagement.
• Handle ongoing website requests (new pages, bug fixes, integrations) during the engagement period.
• You have
• 5+ years of professional web development experience with strong frontend expertise (TypeScript, React, Next.js).
• Proven Sanity expertise. You have built and shipped multiple production websites on Sanity, including schema design, custom Studio components, and GROQ queries.
• Experience leading at least one complex CMS migration end-to-end, ideally from HubSpot, WordPress, or another monolithic CMS to a modern headless stack. You know how to preserve SEO rankings, handle redirects, and migrate content cleanly.
• Strong understanding of technical SEO, Core Web Vitals, and modern web performance optimization.
• Comfort with version control (Git), CI/CD pipelines, and modern deployment platforms (Vercel, Netlify, or similar).
• Experience integrating HubSpot forms and tracking with a Next.js frontend.
• An eye for design and str

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