What makes Fullstack Guardian different from standard coding assistants?

It enforces a security-first workflow that requires technical design documents and multi-layer validation (client and server) before any code is finalized.

Can I use it for microservices?

Absolutely. It includes specific patterns for microservices, message queues, observability, and containerization.

Does this skill handle database migrations?

Yes, it is designed to manage data flows from the database layer through the API and into the frontend UI.

How does it ensure security?

It follows a 'Must Do' checklist including parameterized queries, output sanitization, and logging of all security-relevant events.

Fullstack Guardian

Name: Fullstack Guardian
Author: Jeffallan

byJeffallan

•

API Development

Implements secure, scalable, and end-to-end features across frontend, backend, and security layers.

About

Fullstack Guardian functions as a senior lead engineer within Claude Code, bridging the gap between user interface design and backend architecture. It focuses on the 'three-layer' approach—Frontend for UX, Backend for logic, and Security for protection—to ensure that every feature is production-ready from the start. By enforcing strict validation, parameterized queries, and comprehensive error handling, this skill helps developers build robust applications while maintaining a clear audit trail through automated technical design documentation.

Key Features

Automated generation of technical design documents and specifications
Cross-cutting concern management including logging, caching, and validation
7 GitHub stars
Security-first architecture with built-in XSS and SQL injection prevention
Standardized API development for REST and GraphQL services
End-to-end feature implementation from database schema to UI components

Use Cases

Implementing a new authenticated user feature requiring both API endpoints and React components
Architecting microservices with real-time WebSocket integration and deployment pipelines
Refactoring existing code to improve security posture and error handling across the stack

About

Key Features

Automated generation of technical design documents and specifications
Cross-cutting concern management including logging, caching, and validation
7 GitHub stars
Security-first architecture with built-in XSS and SQL injection prevention
Standardized API development for REST and GraphQL services
End-to-end feature implementation from database schema to UI components

Use Cases

Implementing a new authenticated user feature requiring both API endpoints and React components
Architecting microservices with real-time WebSocket integration and deployment pipelines
Refactoring existing code to improve security posture and error handling across the stack