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Backend development

Skill martian56/claude-engineer/plugins/claude-engineer/skills/backend-development

Claude Code marketplace and home of claude-engineer: an opinionated, design-system-first, plan-gated autonomous engineer for full greenfield React/Next and FastAPI projects.

Install
npx -y skills add martian56/claude-engineer --skill backend-development

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One thing to look at

  • 2 stars2 stars. Stars are a popularity signal and not a quality one, but at this level it is likely that nobody has read this closely except its author, and you would be relying on your own review.

What its author says it does

Copied from the file, not written here

Use when building or structuring a Python backend on FastAPI + SQLAlchemy 2.0 (async) + Alembic + Pydantic v2. Provides the opinionated project layout, the standard kit (auth, async jobs, caching, storage, observability), and best practices.

SKILL.md

2.4 KB, as published. Nobody here has run it

Backend Development

Announce at start: "I'm using claude-engineer:backend-development to build the FastAPI backend."

The stack (defaults)

Python 3.12+ · FastAPI · SQLAlchemy 2.0 async (asyncpg) · Alembic · Pydantic v2 + pydantic-settings · uv (deps/venv) · ruff (lint+format) · mypy (types) · pytest (tests). Domain-modular layout: src/<domain>/{router,schemas,models,service,dependencies}.py.

The standard kit (scaffold these by default)

  • Auth & security - OAuth2 password flow, JWT access + refresh, password hashing (argon2/bcrypt), rate limiting, CORS, security headers.
  • Async jobs & scheduling - a task queue + scheduled jobs over Redis (see the reference for the recommended library and why).
  • Caching & object storage - Redis cache patterns + an S3/MinIO storage abstraction.
  • Observability - structured logging, Sentry, OpenTelemetry traces, /health + /ready endpoints.

Non-negotiables

  1. Async all the way - async engine + session-per-request dependency; no sync DB calls in request paths.
  2. Migrations are real - every schema change ships an Alembic migration (async-compatible); never auto-create in prod paths.
  3. Typed & validated - Pydantic v2 request/response models; mypy clean (hard gate).
  4. Tested - pytest + pytest-asyncio + httpx AsyncClient against a real test DB; meet the coverage threshold.
  5. Config via pydantic-settings - no secrets in code; env-driven; documented required vars.
  6. Services in Docker, app native - connect to Postgres/Redis/MinIO/Mailpit on localhost (claude-engineer:docker-dev-environment); run uvicorn natively.

Full detail: read references/fastapi-stack.md (exact project structure, SQLAlchemy 2.0 patterns, async Alembic setup, the job-queue recommendation, auth, observability, the blessed-packages list, pyproject.toml) on demand.

Red flags - STOP

  • A sync DB driver or blocking I/O in an async endpoint.
  • A model change without a matching Alembic migration.
  • Secrets/config literals in source instead of pydantic-settings + env.
  • Shipping an endpoint with no test.

Keep looking

Skills are one crate of 328,083. Ordering is by how many stacks a row turns up in, so the top of any crate is what has actually been picked rather than what has the most stars.