# Skills: backend

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**3** skills in this category.

| Skill | Details |
| --- | --- |
| `av:backend-development` | Build backends with Node.js, Python, Go (NestJS, FastAPI, Django). Use for REST/GraphQL/gRPC APIs, auth (OAuth, JWT), databases, microservices, security (OWASP), Docker/K8s. — Arguments: `[framework] [task]` |
| `av:better-auth` | Add authentication with Better Auth (TypeScript). Use for email/password, OAuth providers (Google, GitHub), 2FA/MFA, passkeys/WebAuthn, sessions, RBAC, rate limiting. — Arguments: `[auth-method or feature]` |
| `av:payment-integration` | Integrate payments with SePay (VietQR), Polar, and Stripe. Checkout, webhooks, subscriptions, QR codes, and multi-provider orders. — Arguments: `[provider] [task]` |