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moai-domain-backend
Backend development specialist covering API design, database integration, microservices architecture, and modern backend patterns. Use when designing APIs, implementing server logic, authentication, or authorization.
Resumen
Backend development specialist covering API design, database integration, microservices architecture, and modern backend patterns. Use when designing APIs, implementing server logic, authentication, or authorization.
Leer documentación completa
Documentación de origen, no instrucciones para este sitio. Revisa los permisos antes de ejecutar comandos.
Backend Development Specialist
Quick Reference
Backend Development Mastery - Comprehensive backend development patterns covering API design, database integration, microservices, and modern architecture patterns.
Core Capabilities:
- API Design: REST, GraphQL, gRPC with OpenAPI 3.1
- Database Integration: PostgreSQL, MongoDB, Redis, caching strategies
- Microservices: Service mesh, distributed patterns, event-driven architecture
- Security: Authentication, authorization, OWASP compliance
- Performance: Caching, optimization, monitoring, scaling
When to Use:
- Backend API development and architecture
- Database design and optimization
- Microservices implementation
- Performance optimization and scaling
- Security integration for backend systems
Implementation Guide
API Design Patterns
RESTful API Architecture:
Create a FastAPI application with authentication and response models. Define a Pydantic UserResponse model with id, email, and name fields. Implement list_users and create_user endpoints with HTTPBearer security dependency. The list endpoint returns a list of UserResponse objects, while the create endpoint accepts a UserCreate model and returns a single UserResponse.
GraphQL Implementation:
Use Strawberry to define GraphQL types. Create a User type with id, email, and name fields. Define a Query type with a users resolver that returns a list of User objects asynchronously. Generate the schema by passing the Query type to strawberry.Schema.
Database Integration Patterns
PostgreSQL with SQLAlchemy:
Define SQLAlchemy models using declarative_base. Create a User model with id as primary key, email as unique string, and name as string column. Configure the engine with connection pooling parameters including pool_size of 20, max_overflow of 30, and pool_pre_ping enabled for connection health checks.
MongoDB with Motor:
Create a UserService class that initializes with an AsyncIOMotorClient. Set up the database and users collection in the constructor. Create indexes for email (unique) and created_at fields. Implement create_user method that inserts a document and returns the inserted_id as string.
Microservices Architecture
Service Discovery with Consul:
Create a ServiceRegistry class that connects to Consul. Implement register_service method that registers a service with name, id, port, and health check endpoint. Implement discover_service method that queries healthy services and returns list of adddess:port strings.
Event-Driven Architecture:
Create an EventBus class using aio_pika for AMQP messaging. Implement connect method to establish connection and channel. Implement publish_event method that serializes event type and data as JSON and publishes to the default exchange with routing_key matching the event type.
Advanced Patterns
Caching Strategies
Redis Integration:
Create a CacheManager class with Redis connection. Implement a cache_result decorator that accepts ttl parameter. The decorator generates cache keys from function name and arguments, checks Redis for cached results, executes the function on cache miss, and stores results with expiration. Use json.loads and json.dumps for serialization.
Security Implementation
JWT Authentication:
Create a SecurityManager class with CryptContext for bcrypt password hashing. Implement hash_password and verify_password methods using the context. Implement create_access_token that encodes a JWT with expiration time using HS256 algorithm. Default expiration is 15 minutes if not specified.
Performance Optimization
Database Connection Pooling:
Create an optimized SQLAlchemy engine with QueuePool, pool_size 20, max_overflow 30, pool_pre_ping enabled, and pool_recycle of 3600 seconds. Add event listeners for before_cursor_execute and after_cursor_execute to track query timing. Log warnings for queries exceeding 100ms threshold.
Works Well With
- moai-domain-frontend - Full-stack development integration
- moai-domain-database - Advanced database patterns
- moai-foundation-core - MCP server development patterns for backend services
moai-foundation-quality+moai-ref-owasp-checklist- Security validation and compliance- moai-foundation-core - Core architectural principles
Technology Stack
Primary Technologies:
- Languages: Python 3.13+, Node.js 20+, Go 1.23
- Frameworks: FastAPI, Django, Express.js, Gin
- Databases: PostgreSQL 16+, MongoDB 7+, Redis 7+
- Message Queues: RabbitMQ, Apache Kafka, Redis Pub/Sub
- Containerization: Docker, Kubernetes
- Monitoring: Prometheus, Grafana, OpenTelemetry
Integration Patterns:
- RESTful APIs with OpenAPI 3.1
- GraphQL with Apollo Federation
- gRPC for high-performance services
- Event-driven architecture with CQRS
- API Gateway patterns
- Circuit breakers and resilience patterns
Resources
For working code examples, see examples.md.
Status: Production Ready Last Updated: 2026-01-11 Maintained by: MoAI-ADK Backend Team
Common Rationalizations
| Rationalization | Reality |
|---|---|
| "Input validation can happen on the frontend" | Frontend validation is UX. Backend validation is security. They serve different purposes and both are required. |
| "This endpoint is internal, it does not need authentication" | Internal endpoints are reachable from compromised services. Zero-trust means every endpoint validates identity. |
| "I will add error handling later" | Unhandled errors leak stack traces, connection strings, and internal state. Error handling is day-one work. |
| "The ORM handles SQL injection" | ORMs protect parameterized queries. Raw queries, dynamic filters, and ORDER BY clauses still need escaping. |
| "This API is backward-compatible, no version bump needed" | Removing optional fields, changing defaults, or altering error formats are breaking changes to existing callers. |
| "Microservices are overkill, I will just add another endpoint" | Unbounded endpoint growth creates a monolith-in-disguise. Evaluate service boundaries before adding. |
Hyrum's Law: With a sufficient number of users, every observable behavior of your API will be depended on by somebody. Changing anything, no matter how trivial, can break someone.
Red Flags
- API endpoint accepts user input without validation or sanitization
- Error response includes stack trace or internal path information
- Database credentials hardcoded in source code instead of environment variables
- No rate limiting configured on public-facing endpoints
- API returns 200 OK for every failure case with error in the response body
- Raw SQL queries built with string concatenation
Verification
- Every endpoint validates input before processing (show validation middleware or checks)
- Error responses use standard format without internal details (show sample error response)
- Credentials sourced from environment variables, not config files (grep for hardcoded secrets)
- Rate limiting configured on public endpoints (show middleware registration)
- API versioning strategy documented and enforced
- Database queries use parameterized statements (no string concatenation with user input)
- Authentication required on all non-public endpoints (show auth middleware)
Refactor Notes
Refactor scope (deferred to future sub-SPEC):
- Narrow body to API design decision matrix (REST vs GraphQL vs tRPC vs gRPC)
- Extract language-specific implementation details into Level-3 modules
- Remove framework-specific content that duplicates language skill coverage
This skill is retained in v3.0 but its body will be restructured in a follow-up SPEC.
Metadatos del archivo
name: moai-domain-backend description: > Backend development specialist covering API design, database integration, microservices architecture, and modern backend patterns. Use when designing APIs, implementing server logic, authentication, or authorization. when_to_use: > Use for backend work: API design (REST, GraphQL, gRPC), server logic, authentication and authorization, microservices, middleware, caching, and frameworks (FastAPI, Express, Django, Flask). Covers serverless, PostgreSQL, MongoDB, and Redis integration. license: Apache-2.0 compatibility: Designed for Claude Code allowed-tools: Read, Write, Edit, Bash(npm:*), Bash(npx:*), Bash(node:*), Bash(uv:*), Bash(pip:*), Bash(pytest:*), Bash(ruff:*), Bash(docker:*), Bash(curl:*), Bash(go:*), Bash(cargo:*), Grep, Glob user-invocable: false metadata: version: "1.0.0" category: "domain" status: "active" updated: "2026-01-11" modularized: "false" tags: "backend, api, database, microservices, architecture" author: "MoAI-ADK Team"
Ver texto original
--- name: moai-domain-backend description: > Backend development specialist covering API design, database integration, microservices architecture, and modern backend patterns. Use when designing APIs, implementing server logic, authentication, or authorization. when_to_use: > Use for backend work: API design (REST, GraphQL, gRPC), server logic, authentication and authorization, microservices, middleware, caching, and frameworks (FastAPI, Express, Django, Flask). Covers serverless, PostgreSQL, MongoDB, and Redis integration. license: Apache-2.0 compatibility: Designed for Claude Code allowed-tools: Read, Write, Edit, Bash(npm:*), Bash(npx:*), Bash(node:*), Bash(uv:*), Bash(pip:*), Bash(pytest:*), Bash(ruff:*), Bash(docker:*), Bash(curl:*), Bash(go:*), Bash(cargo:*), Grep, Glob user-invocable: false metadata: version: "1.0.0" category: "domain" status: "active" updated: "2026-01-11" modularized: "false" tags: "backend, api, database, microservices, architecture" author: "MoAI-ADK Team" --- # Backend Development Specialist ## Quick Reference Backend Development Mastery - Comprehensive backend development patterns covering API design, database integration, microservices, and modern architecture patterns. Core Capabilities: - API Design: REST, GraphQL, gRPC with OpenAPI 3.1 - Database Integration: PostgreSQL, MongoDB, Redis, caching strategies - Microservices: Service mesh, distributed patterns, event-driven architecture - Security: Authentication, authorization, OWASP compliance - Performance: Caching, optimization, monitoring, scaling When to Use: - Backend API development and architecture - Database design and optimization - Microservices implementation - Performance optimization and scaling - Security integration for backend systems --- ## Implementation Guide ### API Design Patterns RESTful API Architecture: Create a FastAPI application with authentication and response models. Define a Pydantic UserResponse model with id, email, and name fields. Implement list_users and create_user endpoints with HTTPBearer security dependency. The list endpoint returns a list of UserResponse objects, while the create endpoint accepts a UserCreate model and returns a single UserResponse. GraphQL Implementation: Use Strawberry to define GraphQL types. Create a User type with id, email, and name fields. Define a Query type with a users resolver that returns a list of User objects asynchronously. Generate the schema by passing the Query type to strawberry.Schema. ### Database Integration Patterns PostgreSQL with SQLAlchemy: Define SQLAlchemy models using declarative_base. Create a User model with id as primary key, email as unique string, and name as string column. Configure the engine with connection pooling parameters including pool_size of 20, max_overflow of 30, and pool_pre_ping enabled for connection health checks. MongoDB with Motor: Create a UserService class that initializes with an AsyncIOMotorClient. Set up the database and users collection in the constructor. Create indexes for email (unique) and created_at fields. Implement create_user method that inserts a document and returns the inserted_id as string. ### Microservices Architecture Service Discovery with Consul: Create a ServiceRegistry class that connects to Consul. Implement register_service method that registers a service with name, id, port, and health check endpoint. Implement discover_service method that queries healthy services and returns list of adddess:port strings. Event-Driven Architecture: Create an EventBus class using aio_pika for AMQP messaging. Implement connect method to establish connection and channel. Implement publish_event method that serializes event type and data as JSON and publishes to the default exchange with routing_key matching the event type. --- ## Advanced Patterns ### Caching Strategies Redis Integration: Create a CacheManager class with Redis connection. Implement a cache_result decorator that accepts ttl parameter. The decorator generates cache keys from function name and arguments, checks Redis for cached results, executes the function on cache miss, and stores results with expiration. Use json.loads and json.dumps for serialization. ### Security Implementation JWT Authentication: Create a SecurityManager class with CryptContext for bcrypt password hashing. Implement hash_password and verify_password methods using the context. Implement create_access_token that encodes a JWT with expiration time using HS256 algorithm. Default expiration is 15 minutes if not specified. ### Performance Optimization Database Connection Pooling: Create an optimized SQLAlchemy engine with QueuePool, pool_size 20, max_overflow 30, pool_pre_ping enabled, and pool_recycle of 3600 seconds. Add event listeners for before_cursor_execute and after_cursor_execute to track query timing. Log warnings for queries exceeding 100ms threshold. --- ## Works Well With - moai-domain-frontend - Full-stack development integration - moai-domain-database - Advanced database patterns - moai-foundation-core - MCP server development patterns for backend services - `moai-foundation-quality` + `moai-ref-owasp-checklist` - Security validation and compliance - moai-foundation-core - Core architectural principles --- ## Technology Stack Primary Technologies: - Languages: Python 3.13+, Node.js 20+, Go 1.23 - Frameworks: FastAPI, Django, Express.js, Gin - Databases: PostgreSQL 16+, MongoDB 7+, Redis 7+ - Message Queues: RabbitMQ, Apache Kafka, Redis Pub/Sub - Containerization: Docker, Kubernetes - Monitoring: Prometheus, Grafana, OpenTelemetry Integration Patterns: - RESTful APIs with OpenAPI 3.1 - GraphQL with Apollo Federation - gRPC for high-performance services - Event-driven architecture with CQRS - API Gateway patterns - Circuit breakers and resilience patterns --- ## Resources For working code examples, see [examples.md](examples.md). Status: Production Ready Last Updated: 2026-01-11 Maintained by: MoAI-ADK Backend Team <!-- moai:evolvable-start id="rationalizations" --> ## Common Rationalizations | Rationalization | Reality | |---|---| | "Input validation can happen on the frontend" | Frontend validation is UX. Backend validation is security. They serve different purposes and both are required. | | "This endpoint is internal, it does not need authentication" | Internal endpoints are reachable from compromised services. Zero-trust means every endpoint validates identity. | | "I will add error handling later" | Unhandled errors leak stack traces, connection strings, and internal state. Error handling is day-one work. | | "The ORM handles SQL injection" | ORMs protect parameterized queries. Raw queries, dynamic filters, and ORDER BY clauses still need escaping. | | "This API is backward-compatible, no version bump needed" | Removing optional fields, changing defaults, or altering error formats are breaking changes to existing callers. | | "Microservices are overkill, I will just add another endpoint" | Unbounded endpoint growth creates a monolith-in-disguise. Evaluate service boundaries before adding. | **Hyrum's Law**: With a sufficient number of users, every observable behavior of your API will be depended on by somebody. Changing anything, no matter how trivial, can break someone. <!-- moai:evolvable-end --> <!-- moai:evolvable-start id="red-flags" --> ## Red Flags - API endpoint accepts user input without validation or sanitization - Error response includes stack trace or internal path information - Database credentials hardcoded in source code instead of environment variables - No rate limiting configured on public-facing endpoints - API returns 200 OK for every failure case with error in the response body - Raw SQL queries built with string concatenation <!-- moai:evolvable-end --> <!-- moai:evolvable-start id="verification" --> ## Verification - [ ] Every endpoint validates input before processing (show validation middleware or checks) - [ ] Error responses use standard format without internal details (show sample error response) - [ ] Credentials sourced from environment variables, not config files (grep for hardcoded secrets) - [ ] Rate limiting configured on public endpoints (show middleware registration) - [ ] API versioning strategy documented and enforced - [ ] Database queries use parameterized statements (no string concatenation with user input) - [ ] Authentication required on all non-public endpoints (show auth middleware) <!-- moai:evolvable-end --> ## Refactor Notes **Refactor scope** (deferred to future sub-SPEC): - Narrow body to API design decision matrix (REST vs GraphQL vs tRPC vs gRPC) - Extract language-specific implementation details into Level-3 modules - Remove framework-specific content that duplicates language skill coverage This skill is retained in v3.0 but its body will be restructured in a follow-up SPEC.
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Obtener gratis no significa ejecutar gratis. El precio no es una evaluación de seguridad. Enviar información de precio →
Fuente del skill registrada
La ruta de instrucciones está registrada. No implica pruebas de ejecución, seguridad ni compatibilidad.
Revisar antes de instalar: Evitar instalación automática
Licencia: Apache-2.0
- Dependency or permission surface needs review
- Permission surface may require sandboxing
- Financial research output is not financial advice; require human review before any live investment decision
- SKILL.md lacks an explicit 'Limitations' or 'Safety' section to define safe operating boundaries and potential risks.
- The allowed-tools list is broad (Bash with many package managers, docker, curl) without guidance on when these are safe to use, which could lead to unintended side effects if not carefully scoped.
- Financial research output is not financial advice; require human review before any live investment decision.
- Quality score needs review
- Permission surface needs review: secrets or environment access, shell or command execution
- Dependency/runtime risk: command execution surface, credential or environment access
- Permission surface: secrets or environment access, shell or command execution
Las herramientas son indicios de metadatos, no compatibilidad probada. Los prompts son sugerencias.
Empieza con una tarea pequeña
- 1Lee la fuente y confirma entradas, resultados, dependencias y permisos.
- 2Pide un plan al agente. Aprueba la configuración y los costes antes de probar en un entorno aislado.
- 3Comprueba resultados y archivos modificados. Informa solo de lo ejecutado y conserva la revisión de la fuente.
Consulta dependencias, claves API y costes externos en la fuente. Un repositorio público no implica servicios gratuitos.
Fuente y notas de uso
Los metadatos y revisiones son orientativos. Popularidad, descubrimiento y ejecución correcta son hechos distintos.
- Repositorio fuente
- modu-ai/moai-adk
- Licencia
- Apache-2.0
- Versión
- 1.0.0
- Último push de GitHub
- 3 sept 2026
- Registro actualizado
- 4 sept 2026
- Ruta de instrucciones
- .claude/skills/moai-domain-backend/SKILL.md @ 7ad9f8534dc4
Versión declarada en el registro; consulta las versiones de la fuente.
Calidad
75/100
Sólido
Confianza
58/100
Do not auto-install
Auditoría
75/100
Requiere revisión
- Dependency or permission surface needs review
- Permission surface may require sandboxing
- Financial research output is not financial advice; require human review before any live investment decision
- SKILL.md lacks an explicit 'Limitations' or 'Safety' section to define safe operating boundaries and potential risks.
- The allowed-tools list is broad (Bash with many package managers, docker, curl) without guidance on when these are safe to use, which could lead to unintended side effects if not carefully scoped.
- Financial research output is not financial advice; require human review before any live investment decision.
- Quality score needs review
- Permission surface needs review: secrets or environment access, shell or command execution
- Dependency/runtime risk: command execution surface, credential or environment access
- Permission surface: secrets or environment access, shell or command execution
- Verified installs
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- Resultados
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Más detalles
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"successRate": null,
"recentSuccessRate": null,
"recentFailureRate": null,
"riskBlocked": 0,
"setupRequired": 0,
"notRelevant": 0,
"avgOutputQuality": null,
"avgTimeToUsefulMs": null,
"productionOutcomes": 0,
"humanReviewRequired": 0,
"uniqueAgents": 0,
"lastOutcomeAt": null
},
"signals": [],
"penalties": [
"No real agent outcome evidence yet"
]
},
"audit": {
"score": 75,
"risk_level": "needs_review",
"risk_label": "Needs review",
"warnings": [
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"Financial research output is not financial advice; require human review before any live investment decision",
"SKILL.md lacks an explicit 'Limitations' or 'Safety' section to define safe operating boundaries and potential risks.",
"The allowed-tools list is broad (Bash with many package managers, docker, curl) without guidance on when these are safe to use, which could lead to unintended side effects if not carefully scoped.",
"Financial research output is not financial advice; require human review before any live investment decision.",
"Quality score needs review",
"Permission surface needs review: secrets or environment access, shell or command execution"
]
},
"safety_gate": {
"tier": "blocked",
"label": "Blocked for auto-install",
"auto_install_policy": "block",
"auto_install_allowed": false,
"human_review_required": true,
"blocked": true,
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
},
"quality": {
"score": 75,
"label": "Strong"
},
"supply": {
"track": "Research and knowledge work",
"scenario": "Research agents",
"maintenance": "1mo since push",
"risk": "Needs review"
},
"alternative_skills": [],
"do_not_use_when": [
"teams that need a vendor-supported SLA",
"production agents without a repository review",
"SKILL.md lacks an explicit 'Limitations' or 'Safety' section to define safe operating boundaries and potential risks.",
"High-risk permission hints: Shell or command execution, Secrets or environment access",
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"Financial research output is not financial advice; require human review before any live investment decision",
"The allowed-tools list is broad (Bash with many package managers, docker, curl) without guidance on when these are safe to use, which could lead to unintended side effects if not carefully scoped."
],
"agent_contract": {
"task_input": "Use moai-domain-backend in an agent workflow",
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
"install_policy": "block",
"minimum_review_before_use": [
"Trust: 66/100 Manual review",
"Audit: 75/100 Needs review",
"Safety: 31/100 Avoid automatic install",
"Review repository, license, install command, and permission surface before production use."
],
"expected_agent_output": {
"selected_skill": "modu-ai-moai-domain-backend (moai-domain-backend)",
"install_command": "npx skills add modu-ai/moai-adk --skill moai-domain-backend",
"risk_summary": "Needs review; Blocked for auto-install; Review before production",
"verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
}
},
"outcome_feedback": {
"endpoint": "https://www.openagentskill.com/api/agent/outcome",
"method": "POST",
"requires_resolve_event_id": true,
"event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
"expected_outcomes": [
"success",
"failed",
"not_relevant",
"blocked_by_risk",
"setup_required"
],
"payload_template": {
"event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
"skill_slug": "modu-ai-moai-domain-backend",
"task": "Use moai-domain-backend in an agent workflow",
"agent": "codex",
"outcome": "success",
"install_used": true,
"risk_blocked": false,
"setup_required": false,
"task_success": true,
"output_quality": 4,
"error_type": null,
"human_review_required": false,
"workspace": "sandbox",
"time_to_useful_ms": 120000,
"notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
}
},
"endpoints": {
"web": "https://www.openagentskill.com/skills/modu-ai-moai-domain-backend",
"api": "https://www.openagentskill.com/api/agent/skills/modu-ai-moai-domain-backend",
"audit": "https://www.openagentskill.com/skills/modu-ai-moai-domain-backend/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=modu-ai-moai-domain-backend&task=Use%20moai-domain-backend%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20moai-domain-backend%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20moai-domain-backend%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/modu-ai-moai-domain-backend/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/modu-ai-moai-domain-backend"
}
}Para el creador
Fuente de la ficha
Indexado por Registry
Esta ficha se indexó desde fuentes públicas y no está marcada como oficial hasta que se apruebe una reclamación de mantenedor.
- Creador
- modu-ai
- Fuente
- modu-ai/moai-adk
- Indexado por
- Índice comunitario de OpenAgentSkill
La atribución enlaza al repositorio público o al perfil del creador. Los creadores pueden reclamar la ficha para actualizar las señales de propiedad.
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[](https://www.openagentskill.com/skills/modu-ai-moai-domain-backend/audit)
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