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

# Welcome

Welcome to the Atomic Blend platform technical documentation. This guide is for **engineers who want to contribute to or understand the platform**.

## What is Atomic Blend?

Atomic Blend is an open-source, end-to-end encrypted productivity suite — a privacy-first alternative to Google Suite. It provides calendar, notes, tasks, and mail applications with all user data encrypted client-side.

## Where to Start

| I want to...                | Go to                                                                               |
| --------------------------- | ----------------------------------------------------------------------------------- |
| Understand the system       | [Architecture Overview](/docs/developers/architecture/overview.md)                  |
| Run the backend locally     | [Backend: Getting Started](/docs/developers/backend/getting-started.md)             |
| Run a Flutter app locally   | [App: Getting Started](/docs/developers/apps/getting-started.md)                    |
| Understand the git workflow | [Contributing: Workflow](/docs/developers/contributing/workflow.md)                 |
| Add a new feature           | [Contributing: Adding a Feature](/docs/developers/contributing/adding-a-feature.md) |
| Scaffold a new service      | [New Service Guide](/docs/developers/patterns/new-service.md)                       |

## Repositories

| Repository                                                                                    | Description                |
| --------------------------------------------------------------------------------------------- | -------------------------- |
| [backend/auth](https://gitlab.com/atomic-blend/backend/auth)                                  | Authentication service     |
| [backend/calendar](https://gitlab.com/atomic-blend/backend/calendar)                          | Calendar service           |
| [backend/productivity](https://gitlab.com/atomic-blend/backend/productivity)                  | Notes, tasks, habits       |
| [backend/mail](https://gitlab.com/atomic-blend/backend/mail)                                  | Mail service               |
| [backend/mail-server](https://gitlab.com/atomic-blend/backend/mail-server)                    | SMTP server                |
| [backend/shared](https://gitlab.com/atomic-blend/backend/shared)                              | Shared Go packages         |
| [apps/task](https://gitlab.com/atomic-blend/apps/task)                                        | Task Flutter app           |
| [apps/calendar](https://gitlab.com/atomic-blend/apps/calendar)                                | Calendar Flutter app       |
| [apps/mail](https://gitlab.com/atomic-blend/apps/mail)                                        | Mail Flutter app           |
| [apps/notes](https://gitlab.com/atomic-blend/apps/notes)                                      | Notes Flutter app          |
| [apps/shared](https://gitlab.com/atomic-blend/apps/shared)                                    | Shared Flutter package     |
| [flutter-packages/flutter\_age](https://gitlab.com/atomic-blend/flutter-packages/flutter_age) | Age encryption FFI package |


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