
Kay M
Shopify Facebook Instagram Google Meta Ads Ecommerce SEO Management
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Experiencia laboral
Freelance Web Developer & Tracking Specialist
Upwork • Freelance
Mar 2022 - Present • 4 yrs 5 mos
Built and maintained conversion tracking, backend integrations, and performance optimization systems for eCommerce and service-based clients across Shopify, WooCommerce, and custom platforms. Key projects: SumUp–Shopify Payment Sync Middleware: Built a Node.js/Express integration connecting SumUp Webhooks + Transactions API to Shopify Admin API for real-time order creation and inventory sync, hosted on Render. Core Web Vitals Recovery (todoplagas.cl): Resolved LCP, CLS, and TBT issues via WP Rocket, QUIC.cloud CDN, and Elementor performance tuning — raised mobile PageSpeed score from 42 to 95. Led to a follow-on project at neoplagas.com.mx. CS-Cart Multivendor Build (acealot.com): Developed vendor/wholesale registration flows and promotion configs on UniTheme 2 Multivendor; resolved a critical production incident via SSH/database recovery. WhatsApp + n8n Automation Systems: Designed automation workflows for AI chatbots, appointment booking, lead qualification, and order notifications using n8n and WhatsApp Business API — including an intake automation system for law firm client onboarding.