> For the complete documentation index, see [llms.txt](https://xircus.gitbook.io/xircus-developer-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://xircus.gitbook.io/xircus-developer-docs/fundamentals/backend.md).

# Backend

- [Serverless APIs](https://xircus.gitbook.io/xircus-developer-docs/fundamentals/backend/serverless-apis.md)
- [GraphQL Protocol](https://xircus.gitbook.io/xircus-developer-docs/fundamentals/backend/graphql-protocol.md)
- [NoSQL Database](https://xircus.gitbook.io/xircus-developer-docs/fundamentals/backend/nosql-database.md)