# Backend Dev

> Build and maintain backend services with FastAPI, Pydantic, async endpoints, and PostgreSQL-style data access. Use when Codex needs to create, modify, or review backend API code, routing, validation, service logic, models, or database integration in the backend scope.

- Skill: `sofia8844/backend-dev` (Agent Skill)
- Install (CLI): `npx skillmds@latest add sofia8844/backend-dev`
- Raw SKILL.md: https://api.skillmd.com/api/skills/sofia8844/backend-dev/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Integrations & APIs
- Author: Sofia8844 (https://skillmd.com/u/sofia8844)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/sofia8844/backend-dev

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# Backend Dev

## Instrucciones

- Use FastAPI for HTTP APIs.
- Use Pydantic models for request and response validation.
- Prefer clear separation between `routers/`, `services/`, and `models/`.
- Use async functions when the project architecture supports them.
- Keep endpoint handlers thin and move business logic into services.
- Handle validation and error responses explicitly.

## Tareas

- Create or update REST endpoints.
- Validate incoming and outgoing data.
- Connect backend flows to PostgreSQL or equivalent persistence layers.
- Implement service logic and error handling.
- Review backend changes for regressions in API behavior.