Client: Avantti Tecnologia Contract Type: PJ 6-Month Project (with possibility of extension) Advanced English – Mandatory **About the Opportunity** Avantti Tecnologia is seeking a Senior Shopify & Headless Developer to serve as a technical reference in our e-commerce projects. This professional will be responsible for developing and evolving modern, scalable, and high-performance storefronts, integrating headless technologies, React/Next.js, and Shopify themes (Liquid). We are looking for a specialist capable of combining the best of traditional e-commerce with the most advanced web engineering ecosystem, delivering fast, secure, and flawless user experiences. Requirements: **Key Responsibilities** Develop and architect headless storefronts using React, Next.js, and Shopify Hydrogen. Build modern, highly interactive interfaces using Tailwind CSS and TypeScript. Create, maintain, and optimize Shopify themes (OS 2.0) with deep expertise in Liquid, ensuring performance and visual fidelity. Develop complex solutions using GraphQL and Storefront API (e.g., custom bundles, dynamic pricing, personalized experiences). Lead initiatives to achieve sub-second load time and excellence in Core Web Vitals. Integrate external ecosystems (Headless CMS, ERP, CRM, third-party tools) into a unified architecture. Serve as a technical reference by conducting code reviews and supporting junior developers. **Technical Requirements** Frameworks: React.js (advanced) Next.js (App Router, Server Components, SSR/SSG) Languages & Styling: Liquid (expert) TypeScript Modern CSS (Tailwind, SASS) Tools & Stack: Shopify CLI Git Webpack/Vite Deployment on Vercel or Oxygen GraphQL (advanced) Proficiency in Shopify Admin API and Storefront API **Desirable Certifications (Shopify Academy)** Preference for candidates with verified certifications such as: Shopify Development Fundamentals (Verified Badge) Liquid Storefronts for Theme Developers (Advanced Verified Badge) Headless at Shopify for Developers (Expert Certification) Creating Solutions for Shopify Checkout (Platform Certification) **Qualifications & Experience** Front-end development experience. Direct involvement in the Shopify ecosystem. Portfolio featuring high-performance headless or Shopify Plus stores. Strategic analysis capability regarding Build vs. Buy (apps vs. customizations). Experience in technical leadership, code review, and team mentoring.