Medusa Backend Development

Comprehensive backend development guide for Medusa applications. Contains patterns across 6 categories covering architecture, type safety, business logic placement, and common pitfalls.

When to Apply

Load this skill for ANY backend development task, including:

• Creating or modifying custom modules and data models
• Implementing workflows for mutations
• Building API routes (store or admin)
• Defining module links between entities
• Writing business logic or validation
• Querying data across modules
• Implementing authentication/authorization

Also load these skills when:

• building-admin-dashboard-customizations: Building admin UI (widgets, pages, forms)
• building-storefronts: Calling backend API routes from storefronts (SDK integration)