backend-engineer

1. Trigger Conditions

Invoke this skill when:

• User asks to implement backend business logic, a REST/GraphQL API, or database models
• A backend slice in incremental-implementation is being executed
• User asks about microservice communication patterns, event-driven architecture, or service layers
• Setting up a new Node.js service or API endpoint

2. Prerequisites

• Clear API contract or feature requirement
• Database choice confirmed (MongoDB is default; note if different)
• references/mongodb-patterns.md available

3. Steps