Senior Full-Stack Developer - Meta Integrations & E-commerce (US-based/Remote)

Location: Argentina Paired is a global staffing and recruiting agency that pairs remote work with top-tier talent. We help individuals from around the world connect with great companies that are looking for their specific skill set. Our mission is to provide great jobs to talented people, no matter where they are located. Our client is an e-commerce agency focused exclusively on subscription CPG brands across food, beverage, supplements, and health & wellness. Role Overview: We are looking for a Senior Full-Stack Developer with strong experience building web applications and integrating directly with Meta's ecosystem and APIs. The ideal candidate will have experience developing platforms that connect with Meta, including Meta Authorization, Meta Pixel, Meta APIs, conversion tracking, and user/account authentication. You should be comfortable working across the frontend and backend and building functionality that communicates directly with Meta's infrastructure. Key Responsibilities: Build and maintain full-stack web applications and platforms with complex third-party integrations. Develop functionality comparable to the core user experience and platform architecture of JoinTrybe.com. Build and maintain direct integrations with Meta's APIs and ecosystem. Implement Meta Authorization / OAuth flows for connecting and authenticating Meta accounts. Integrate and manage Meta Pixel and conversion tracking across web applications. Work with Meta APIs to retrieve, send, synchronize, and process relevant platform data. Develop reliable authentication, authorization, account connection, and permission workflows. Build backend services and APIs that support Meta integrations and platform functionality. Develop responsive, high-performance frontend interfaces and user experiences. Design and implement scalable data flows between the application, Meta, and other third-party services. Troubleshoot API authentication, permissions, tracking, data synchronization, and integration issues. Implement event tracking and ensure accurate data transmission between the platform and Meta. Work with webhooks and asynchronous API processes where required. Develop and maintain Shopify integrations and e-commerce functionality where applicable. Optimize application performance, page speed, and Core Web Vitals. Follow Git/GitHub best practices, including branches, pull requests, testing, and code reviews. Implement CRO and A/B testing, including Intelligems experiments. Optimize page speed, Core Web Vitals, mobile performance, and conversion rates. Requirements 5+ years of professional full-stack/web development experience. Strong experience building production web applications across both frontend and backend. Hands-on experience integrating directly with Meta/Facebook APIs and services. Proven experience implementing Meta Authorization, OAuth, or Meta account authentication/connection flows. Strong experience implementing and troubleshooting Meta Pixel and conversion tracking. Experience working with the Meta Graph API or comparable Meta APIs. Understanding of Meta permissions, access tokens, authentication, API limitations, and data flows. Strong JavaScript/TypeScript experience and modern frontend development skills. Strong backend development experience with Node.js or a comparable backend technology. Experience building and consuming REST APIs and working with webhooks. Experience with databases and backend data management. Strong understanding of authentication, authorization, sessions, and secure API integrations. Experience troubleshooting complex third-party integrations and API-related issues. Strong Git/GitHub experience, including branches, pull requests, and code reviews. Nice-to-Have Experience with ReCharge, Skio, or subscription e-commerce. Experience with Intelligems, Convert, or VWO. Knowledge of Replo, Shogun, GemPages, or PageFly. Experience with Figma and paid-media landing pages. DTC e-commerce agency or multi-brand experience. Experience mentoring developers or providing technical leadership. Familiarity with AI-powered development tools. Benefits Remote Working for US Company Competitive Salary