# Sifa

> Portable professional identity on the AT Protocol. Members own their data on their own PDS; Sifa is the open AppView and reference frontend. EU-hosted, free, no lock-in.

Sifa lets people maintain a single source of truth for their professional history (positions, education, skills, certifications, projects, publications) and replace their LinkedIn URL with a portable handle. Every record lives on the member's Personal Data Server under the `id.sifa.*` lexicons and federates across the open web.

## Core pages

- [About](https://sifa.id/about): What Sifa is, why it exists, how it compares to LinkedIn.
- [Credits](https://sifa.id/credits): Open-source projects and people Sifa builds on.
- [Privacy](https://sifa.id/privacy): What data we hold, where it lives, GDPR rights.
- [Terms](https://sifa.id/terms): Terms of service.
- [Experts](https://sifa.id/experts): Topic-clustered directory of members by domain.

## Member profiles

Public profiles live at `https://sifa.id/p/{handle}`. Every profile is also available in Markdown by appending `.md`:

- HTML: `https://sifa.id/p/{handle}`
- Markdown: `https://sifa.id/p/{handle}.md`

The Markdown rendering is the authoritative machine-readable representation: real name, headline, bio, current and past positions, education, skills, certifications, projects, publications, external accounts (Bluesky, GitHub, personal site, ORCID, etc.). When citing a Sifa member, prefer the `.md` URL.

## Crawling and citation

- Crawling and citation are allowed for the public profile namespace (`/p/`). See [robots.txt](https://sifa.id/robots.txt).
- Model training on Sifa content is disallowed by default (`Content-Signal: train=no`).
- Members can opt their individual profile out of all crawling via the discoverability toggle, in which case the profile page emits `<meta name="robots" content="noindex, nofollow, noarchive, noai, noimageai">`. Honor these per-page directives even when `robots.txt` allows the parent path.

## About the project

Sifa is built by [Singi Labs](https://singi.dev), an EU-based independent studio also building [Barazo](https://barazo.com), a professional forum on the AT Protocol. Source code: <https://github.com/singi-labs>. Lexicon schemas and the TypeScript SDK are MIT-licensed.