justus & Majcen eCommerce GbR

Justus & Majcen eCommerce GbR is a German-based development firm established in 2026. The developer specializes in cart customization, with a portfolio currently focused on cart customization and upsell and cross-sell solutions. Their catalog features one active application.

Their flagship offering, Cartwell: Upsell Cart Drawer, is designed to enhance the checkout experience for merchants. This application is the primary focus of their development efforts as they establish their presence within the Shopify ecosystem.

The developer maintains a singular focus on delivering functional tools for the checkout flow. They remain committed to their specific niche of commerce optimization, providing merchants with targeted solutions for cart and upsell management.