Fullstack Engineer (f/m/d)

Who We Are Spread Group is a renowned global provider of customized apparel and lifestyle products, distinguished by our commitment to made-to-order technology. Our core business model revolves around producing precisely what our customers desire, precisely when they desire it. As pioneers in this space, we combine sustainability with on-demand personalization, enabling individuals and businesses to express their unique identities through bespoke creations. Join us to be part of a global leader in the exciting world of personalized apparel and lifestyle products! As we continue to expand our business, we are seeking a curious and passionate individual to join our team as of January 2027, as Fullstack Engineer (f/m/d) and drive our business forward. What Will Your Role Be As a Fullstack Engineer (f/m/d) in our Merchant Experience team, you’ll help build and evolve the digital products our partners and merchants interact with every day. You’ll work across the entire merchant journey — from the Partner Area, where designers manage their designs and shops, to the sign-up and publishing experience that turns an idea into a live SpreadShop, and the Merchant Area, where SpreadConnect merchants manage integrations with Shopify, TikTok, and other platforms. As a Fullstack Engineer (f/m/d), you’ll take ownership beyond individual UI components or API endpoints. You’ll design and implement features end-to-end, collaborate closely with product and design, and ensure that the experiences you build are reliable, performant, and easy to evolve. Your work directly impacts how merchants use and grow with our platform. You’ll build products that make their day-to-day work easier and help drive our business forward. What You´ll Do Build and evolve merchant-facing product surfaces — sign-up and shop creation flows, shop management, design and product administration, sales statistics Build the new publishing journey for shops — from sign-up to a live SpreadShop — and take drop-off out of every step Own small to medium features end to end: design the UI, build theKotlin/Spring endpoints behind it, model the data, and ship both together Extend our backend services where your features need it — new REST endpointsin the shop and partner services, data model changes with a proper migration, and integrations with external platforms such as Shopify or TikTok on the SpreadConnect side Design and consume our REST and GraphQL APIs, and push back when a responseshape makes the frontend's life harder than it needs to be Contribute to our cross-team frontend architecture work — shared components,hooks and API clients, and how we render, test and ship our apps Keep merchant tooling fast — data-heavy tables, sales statistics and editorsare where perceived performance is won or lost Take on larger topics — an epic, a new integration, a new merchant surface —and break them down into something the team can execute: slices, dependencies, open…