Fullstack Developer - Shopify at Zellerfeld – Hamburg | Jobyssey

Your Mission

You'll be our go-to Shopify expert, pushing the boundaries of what the platform can do to build the world's most advanced on-demand manufacturing experience. From custom app development and theme architecture to deep API integrations with our production systems, your work will transform our Shopify store into the central operating system behind Zellerfeld's vision of sustainable, custom-fit footwear. You'll own the platform end-to-end — shaping both its technical foundation today and its headless future tomorrow.

What you'll do

Build and maintain custom Shopify Apps that power our on-demand manufacturing, foot-scanning, and recycling programs
Architect and develop our Shopify theme using Liquid, JSON templates, and modern JavaScript
Design integrations between Shopify Plus and our manufacturing systems, ERP, and logistics partners
Define the platform's data architecture — Metafields, Metaobjects, and the structures that hold a non-standard product model together
Research and prototype a headless architecture as the next step in the platform's evolution
Use Shopify Functions and Flow to customize checkout logic and automate operational workflows
Monitor and optimize Core Web Vitals, speed, and conversion across the storefront
Mentor other developers and establish Shopify best practices as the team grows

Your profile

Required:

Proven ability to build, deploy, and maintain custom Shopify Apps from scratch — including Shopify CLI, OAuth, and webhooks
Deep theme development expertise: Liquid, Sections, Blocks, JSON templates, and modern JS for interactive experiences
Expert-level work with Shopify's APIs — both Storefront (GraphQL) and Admin (REST and GraphQL)
Strong React, JavaScript/TypeScript, and modern HTML/CSS fundamentals
Architectural judgment: knowing when to reach for a theme change, a custom app, a Function, or a headless build
Headless frameworks (Next.js, Remix, or Shopify's Hydrogen/Oxygen)
As a company specializing in both hardware and software, we value close collaboration within our team. Therefore, we are seeking candidates who can join us at our office in Hamburg.

Nice to have:

Hands-on experience with Metafields and Metaobjects for complex product/content modeling
Shopify Functions and Flow in production
CI/CD setup and management
Performance tooling (Lighthouse, WebPageTest, browser profiling)
Experience integrating Shopify with manufacturing systems, ERP, or fulfillment platforms

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