Skill UI

This skill defines mandatory architectural standards and best practices for developing robust, scalable, and observable backend services using Node.js, Express, and TypeScript. It mandates layered architecture (Routes → Controllers → Services → Repositories), strong error handling, dependency injection, and input validation (Zod) to ensure maintainability and reliability in production environments. Use when designing or refactoring core API logic.

Provides a production-ready Documenso reference architecture with example project layout, layered components, data flow, and webhook setup so teams can design, review, and standardize document signing integrations.

Provides a best-practice Supabase reference architecture, outlining the layered directory structure, cached client wrapper, tailored error handling, and health checks useful when designing new integrations or reviewing project standards.