Engineering JBS: Custom Shopify for elbdampf Undergarments & Backend Architecture Connecting Amazon, Shopify & ERP
“Parallel Loop delivered our Shopify storefront and the glue between Amazon and our ERP. Stock, orders, and tracking stay aligned so our team fulfills from one system, not three tabs.”
JBS powers elbdampf, a Shopify ecommerce brand that sells undergarments to consumers. The business needed more than a storefront: a backend architecture that connects Amazon, Shopify, and ERP so merchandising, marketplace sales, and warehouse operations share one reliable flow of product, order, and fulfillment data.
The Omnichannel + ERP Challenge
Parallel Loop built JBS end to end: a complete custom Shopify website for elbdampf and integration services that link Amazon and Shopify with the company ERP. Fashion and apparel teams cannot afford oversells when Amazon inventory diverges from Shopify or when ERP stock counts lag behind storefront updates. JBS required a premium Shopify experience on jbs.dk, scheduled pushes of price and stock from Shopify to Amazon, Amazon order import into Shopify for fulfillment aligned with ERP records, and SP-API tracking when shipments complete. One full-stack developer and one Shopify developer delivered the theme, connectors, and job orchestration on AWS EC2.
- Generic Shopify Theme
- ERP Disconnected from Channels
- Manual Amazon Price & Stock Updates
- Amazon Orders Re-Keyed in Shopify
- Tracking Uploaded Late to Amazon
- Custom Shopify Theme (elbdampf)
- ERP-Aligned Backend Orchestration
- Shopify to Amazon Price & Stock Push
- Amazon Orders into Shopify + ERP Path
- SP-API Tracking on Fulfillment
Phase 1: Custom Shopify Storefront for elbdampf
We developed a complete Shopify website on a custom theme built for undergarments merchandising. Collection navigation, sizing guidance, and brand storytelling are tuned for apparel shoppers on jbs.dk. The Shopify developer collaborated with our full-stack engineer so theme metafields, variant logic, and checkout flows align with the sync services and ERP touchpoints running behind the storefront.
Our custom ecommerce tools and custom software development teams keep customer-facing UX in Shopify while operational truth flows through Node.js services operators can monitor.
Phase 2: Amazon SP-API Sync & ERP-Connected Backend
We created a complete system connecting Amazon and Shopify: import prices and stock from Shopify to Amazon, pull Amazon orders into Shopify, and send tracking to Amazon via SP-API when orders fulfill. The backend architecture treats Shopify as the merchandising hub, ERP as the operational record for inventory and fulfillment planning, and Amazon as an automated sales channel. Agenda Jobs on AWS EC2 schedule catalog pushes, order imports, and ERP updates without blocking the storefront.
PostgreSQL stores sync cursors, SKU mappings between Shopify, Amazon, and ERP identifiers, plus audit trails for finance review. MongoDB captures job telemetry and retry metadata at scale. When warehouse staff fulfill in Shopify, Express services post carrier tracking through Amazon SP-API and notify ERP endpoints so all three systems reflect shipped state.
- Storefront: Custom Shopify theme for elbdampf undergarments.
- ERP layer: Backend architecture unifies Shopify, Amazon, and ERP data.
- Catalog sync: Price and stock pushed from Shopify to Amazon.
- Orders: Amazon purchases imported into Shopify fulfillment queues.
- Tracking: SP-API updates when orders ship; ERP stays in sync.
Quantified Business Outcomes
JBS runs elbdampf on Shopify with Amazon and ERP tied together: one theme, one orchestration layer, and closed-loop fulfillment.
| Performance Metric | Before JBS Stack | JBS + elbdampf (Parallel Loop) |
| Shopify UX | Off-the-shelf theme | Custom Undergarments Theme |
| Systems Integration | Disconnected ERP and channels | Shopify + Amazon + ERP Architecture |
| Amazon Stock & Price | Manual updates | Automated Push from Shopify |
| Amazon Orders & Tracking | Re-keyed, delayed tracking | Shopify Import + SP-API on Fulfill |
Technical Deep-Dive: Frequently Asked Questions
How does ERP fit into the JBS architecture?
The Node.js orchestration layer exchanges inventory and order events with the ERP so warehouse and finance teams work from the same numbers Shopify exposes to shoppers and Amazon receives on listings. Shopify remains the merchandising source for price pushes to Amazon while ERP validates stock movements that jobs propagate across channels.
Why push price and stock from Shopify to Amazon?
elbdampf campaigns and variant updates originate in Shopify first. Scheduled Agenda Jobs read Shopify variant price and inventory, map SKUs to Amazon ASINs, and apply SP-API updates. That direction keeps Amazon listings aligned with the storefront merchandising team controls daily.
What happens when an Amazon order ships?
Fulfillment in Shopify triggers tracking capture, SP-API confirmation to Amazon, and ERP status updates. Buyers on Amazon receive tracking promptly while JBS operators avoid manual uploads across separate admin tools.
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