OpenZeppelin provides security products to build, automate and operate dApps and audits for decentralized systems.
Senior Web Developer – Contractor
Location
Worldwide
Posted
7 days ago
Salary
0
Seniority
Senior
Job Description
Senior Web Developer – Contractor
OpenZeppelin
• 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.
Job Requirements
- 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.
Benefits
- 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 🚀
Related Guides
Related Job Pages
More Frontend Engineer Jobs
• Develop and maintain backend APIs and modern frontend interfaces (Next.js App Router) • Contribute to critical modules such as: fee calculation engine, ledger system, and smart routing mechanisms • Design and optimize high-performance data models with Prisma / ZenStack and PostgreSQL • Build merchant and admin dashboards (React) • Participate in architectural decisions in a high-security environment (PCI-DSS) • Write robust tests and participate in code reviews • Work closely with the engineering team on the platform’s evolution
Senior Frontend Engineer
Weekday (YC W21)We are a Y-Combinator-backed startup building your AI-powered Recruiter Agent
• Lead the development of scalable frontend components and features using React.js and modern JavaScript frameworks. • Write clean, maintainable, and reusable code following frontend engineering best practices and coding standards. • Build responsive, accessible, and user-friendly interfaces across web applications. • Partner with Product Managers, Designers, and Backend Engineers to translate business requirements and design concepts into functional user experiences. • Contribute to improving overall user experience, visual consistency, and frontend architecture. • Optimize frontend applications for speed, responsiveness, scalability, and cross-browser compatibility. • Improve rendering performance and application efficiency across desktop and mobile devices. • Implement best practices for frontend performance monitoring and optimization. • Integrate frontend components with backend APIs, services, and data sources. • Work collaboratively with cross-functional teams to ensure seamless end-to-end product functionality. • Participate in technical discussions and contribute to architectural decisions. • Conduct code reviews to ensure maintainability, scalability, and code consistency. • Mentor and support junior frontend engineers through technical guidance and best practices. • Promote strong engineering culture and continuous improvement across the team. • Stay updated with the latest frontend technologies, frameworks, and industry trends. • Evaluate and adopt modern tools and practices that improve developer productivity and product quality.
Senior Frontend Engineer
Weekday (YC W21)We are a Y-Combinator-backed startup building your AI-powered Recruiter Agent
Role Description We are looking for a highly skilled and experienced Senior Frontend Engineer with strong expertise in React.js to join a fast-growing engineering team building next-generation enterprise AI products. This role focuses on architecting and developing modern, scalable, and high-performance web applications that deliver intuitive and engaging user experiences. - Lead the development of scalable frontend components and features using React.js and modern JavaScript frameworks. - Write clean, maintainable, and reusable code following frontend engineering best practices and coding standards. - Build responsive, accessible, and user-friendly interfaces across web applications. - Partner with Product Managers, Designers, and Backend Engineers to translate business requirements and design concepts into functional user experiences. - Contribute to improving overall user experience, visual consistency, and frontend architecture. - Optimize frontend applications for speed, responsiveness, scalability, and cross-browser compatibility. - Improve rendering performance and application efficiency across desktop and mobile devices. - Implement best practices for frontend performance monitoring and optimization. - Integrate frontend components with backend APIs, services, and data sources. - Work collaboratively with cross-functional teams to ensure seamless end-to-end product functionality. - Participate in technical discussions and contribute to architectural decisions. - Conduct code reviews to ensure maintainability, scalability, and code consistency. - Mentor and support junior frontend engineers through technical guidance and best practices. - Promote strong engineering culture and continuous improvement across the team. - Stay updated with the latest frontend technologies, frameworks, and industry trends. - Evaluate and adopt modern tools and practices that improve developer productivity and product quality. Qualifications - Bachelor’s degree in Computer Science, Engineering, or a related field. - 4+ years of experience in frontend development with strong expertise in React.js. - Strong proficiency in JavaScript, HTML5, CSS3, and modern frontend development practices. - Experience with CSS preprocessors such as Sass or Less. - Familiarity with state management libraries such as Redux or MobX. - Understanding of asynchronous programming concepts and API integrations. - Strong knowledge of responsive design and mobile-first development principles. - Experience optimizing frontend performance and understanding browser rendering behavior. - Hands-on experience with Git and collaborative development workflows. - Excellent problem-solving, communication, and teamwork skills. Requirements - Experience working on enterprise SaaS or AI-driven platforms. - Familiarity with frontend testing frameworks and component libraries. - Exposure to scalable design systems and modern UI architectures. - Experience working in agile and fast-paced product environments. Benefits - Salary range: Rs 4000000 - Rs 8000000 (ie INR 40-80 LPA) - Location: Remote (India) - Job Type: full-time
Middle Full Stack Engineer, Frontend Focus
Sigma Software GroupWe support enterprises, product houses, and startups with custom software solutions development and IT consulting.
• Projetar, desenvolver e implementar sistemas distribuídos em larga escala para garantir escalabilidade, baixa latência e tolerância a falhas • Desenvolver e manter recursos front-end usando React JS • Implementar APIs e soluções orientadas a eventos para atender aos requisitos do sistema • Criar e executar testes unitários, testes de API, testes de regressão e testes de desempenho • Otimizar soluções para escalabilidade, confiabilidade e alto desempenho • Colaborar estreitamente com equipes multifuncionais para resolver incidentes de produção



