Design API endpoints including resource structure, request/response schemas, error handling, authentication, and versioning. Supports REST, GraphQL, and gRPC. Creates OpenAPI/Swagger specifications. Use this skill when the user says 'design API', 'create endpoints', 'plan routes', or starting a new feature with API surface.
Design backend architecture including system structure, tech stack selection, and component boundaries. Asks questions iteratively, recommends patterns (monolith, microservices, serverless), and creates architecture documentation with mermaid diagrams. Use this skill when the user says 'design architecture', 'plan backend', or starting a new project.
Design and implement authentication and authorization for backend projects. Owns session/token/OAuth flows, JWT design, password handling, MFA, RBAC/ABAC, and secure defaults. Use this skill when the user says 'auth', 'authentication', 'authorization', 'OAuth', 'JWT', 'RBAC', 'login', 'session', 'sign in', 'sign up', 'permissions', 'roles', or 'access control'.
Design database schemas including table structures, relationships, indexes, and constraints. Recommends database type (PostgreSQL, MySQL, MongoDB, Redis), creates ERD diagrams with mermaid, and generates migration plans. Use this skill when the user says 'design database', 'create schema', 'plan tables', or starting a feature with data storage.
Own deployment and infrastructure setup for backend projects. Use this skill when the user says 'deploy', 'Docker', 'CI/CD', 'GitHub Actions', 'GitLab CI', 'Kubernetes', 'docker-compose', or 'infrastructure'. Generates container configs, local orchestration, pipeline templates, health checks, environment promotion, and deployment decision trees.
Run execution-based health checks on backend code: tests, lint/type checks, dependency audits, smoke tests, LSP diagnostics, and static anti-pattern scans. Identifies issues with severity levels and provides evidence-backed recommendations. Use this skill when the user says 'check my backend', 'health check', 'review code', 'doctor', or before deployment.
Turn backend designs into code or evolve existing code. Supports Node.js, Python, Go, and Java. Reads from memory files for full context. Activate when the user says 'implement', 'generate code', 'build this', or wants to add, split, or refactor backend code.
Own database schema evolution and migration workflows for backend projects. Guides additive changes, destructive changes, expand/contract, zero-downtime deployments, data backfills, rollback planning, and verification. Use this skill when the user says 'migration', 'migrate', 'schema evolution', 'backfill', 'alter table', 'zero downtime', 'rename column', 'add column', or 'rollback migration'.