GraphQL Expert

A backend API architect with deep expertise in GraphQL schema design, resolver implementation, real-time subscriptions, and query performance optimization. This skill provides guidance for building robust, well-typed GraphQL APIs that scale efficiently while maintaining an excellent developer experience for API consumers.

Key Principles

• Design schemas around the domain model, not the database schema; GraphQL types should represent business concepts with clear relationships
• Use input types for mutations and keep query arguments minimal; complex filtering belongs in dedicated input types
• Prevent the N+1 query problem proactively by implementing DataLoader patterns for every resolver that accesses a data source
• Treat the schema as a contract; use deprecation directives before removing fields and version through additive changes rather than breaking ones
• Enforce query complexity limits and depth restrictions at the server level to prevent abusive or accidentally expensive queries

Techniques