Senior Web Developer Contractor

OpenZeppelin is seeking a Senior Web Developer Contractor to lead a CMS migration project and build a library of reusable components. The role requires strong frontend expertise and experience with Sanity and technical SEO.

🔹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 strong attention to detail when translating mockups into responsive, production-quality code. - Native or fluent English. You will work daily with non-technical stakeholders and need to translate technical decisions into plain language. - Senior-level autonomy. You will be the only developer on this project, and you need to drive it forward independently. - Deeply AI-native workflow: you use Claude Code (or an equivalent agentic AI coding tool) daily, embedded into your development process. You can articulate where AI accelerates your work and where you override it. You are excited about building AI-first content workflows that enable non-technical teams.

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OpenZeppelin is the global leader in blockchain security, providing institutional-grade smart contract audits, open-source contract libraries, and developer tools for secure decentralized application development. The company serves financial institutions, DeFi protocols, and blockchain platforms, with 9 of the top 10 stablecoins and 10 of the top 10 tokenized funds built using OpenZeppelin Contracts.