I work at Jumbo Supermarkten in software engineering. At Jumbo we have a big tech department (affectionately called the Jumbo Tech Campus, or JTC) where we work on all of our digital products: from eCommerce and planning applications to AI driven models for stocking and inventory. I'm going to focus mostly on the eCommerce branch, since this is where we can make a big impact on our customer experience.
For our tech stack: we have an eCommerce engine which is enriched by (micro) applications and components built in Vue.js and Nuxt.js. There are multiple teams working on fulfilling the eCommerce goals and in order to deliver user interfaces as effectively as possible, we've built a component library that (in general, but we'll get to that) follows the designs and design system.