Klaviyo Developer for eCommerce Marketing Agency

About the role We're looking for a Full Stack Klaviyo Developer to help build, optimize, and maintain the technical systems behind our email marketing operations. You'll work closely with our design, strategy, and marketing teams to develop high-quality email experiences, troubleshoot API integrations, support eCommerce platforms, and build scalable solutions that keep client campaigns running smoothly. What you'll do - Develop, test, and maintain front-end and back-end applications - Build responsive HTML email templates and landing pages - Develop and troubleshoot API integrations Support Shopify and other eCommerce platform integrations - Optimize application performance across browsers and devices - Debug technical issues involving servers, APIs, and marketing platforms - Collaborate with designers, marketers, and strategists to launch client campaigns - Write clean, maintainable, scalable code Identify opportunities to improve systems and development workflows What we're looking for Required - Experience with Klaviyo - 2+ years of Full Stack or Backend development experience - Strong front-end development skills (HTML, CSS, JavaScript) - Experience building and troubleshooting APIs - Experience with eCommerce platforms such as Shopify - Experience working in an agency environment - Strong professional English communication skills - Available to work 9:00 AM–5:00 PM EST Nice to Have Tools You’ll Use ClickUp Klaviyo Shopify Slack Google Workspace HTML CSS JavaScript APIs Git