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Senior Full Stack Developer at Activate Talent. We are looking for a highly capable, hands-on . Senior Full Stack Developer. with . 4–6 years of professional experience. . This role is for a builder who understands both the . how. and . why. behind the code.. We aren’t looking for someone who simply stitches together frontend frameworks. Instead, we need a developer who can write . clean, high-performance vanilla JavaScript. , build reliable backend systems, and manage the infrastructure that powers them.. You will be responsible for building end-to-end web experiences, managing . custom Shopify environments. , and maintaining the backend systems and infrastructure that support them.. Key Responsibilities. No-Framework Frontend. Develop interactive, lightweight user interfaces using . Vanilla JavaScript and jQuery. . Solve complex UI challenges without relying on frameworks such as React, Vue, or Angular . Build performant frontend experiences optimized for speed and usability . Custom Shopify Development. Build and maintain . custom Shopify themes. using Liquid . Implement advanced logic and custom functionality using Shopify APIs and Shopify Functions . Backend & Database Management. Design, build, and maintain . SQL databases. . Develop server-side logic using . PHP. . Ensure systems are scalable, secure, and efficient . Infrastructure & Deployment. Manage hosting and deployment environments on . Heroku and AWS. . Configure and maintain . Cron jobs. for automated server-side processes . Monitor system performance and troubleshoot infrastructure issues . System Integration. Build and consume . REST APIs. to connect storefront systems with internal tools and third-party services . Maintain reliable integrations and ensure smooth data flow across platforms . . 4–6 years of experience. in a professional full-stack development role . Expert-level knowledge of . Shopify development. , including Liquid, Shopify APIs, and Shopify Functions . Strong proficiency in . PHP, SQL, and Vanilla JavaScript. . Experience managing . Heroku environments. and backend deployments . Ability to manage databases and perform migrations . Experience setting up and maintaining . server-side scheduled tasks (Cron). . Nice to Have. Experience with . programmatic image processing. , generation, or manipulation . Tools such as GD Library, ImageMagick, or Canvas . Experience handling . complex scripting, heavy data processing, or asset manipulation. in real time . Company Location: Colombia.