• Develop full front-end implementation of assigned slot game(s) • Implement game logic based on supplied mathematics and design documentation • Build and manage game states, transitions, and feature flows • Integrate UI, animations, and audio assets into gameplay • Implement reel behavior, bonus features, and game mechanics • Ensure responsive behavior across mobile and desktop devices • Optimize performance (FPS, memory usage, loading times) • Fix bugs and support QA throughout development and release cycle • Collaborate closely with QA, designers, mathematicians, and backend teams • Deliver stable production builds ready for release

• 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.

• 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

• 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.