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sidebar_position: 0
title: Introduction
---

# Introduction

This section is for **fino-filing contributors and developers**.

- [Codebase](/docs/dev/Codebase) - Package layout, `src/` and test structure
- [Implementation](/docs/dev/Implementations) - Boundaries and main classes (Collection, Filing, Collector, etc.)
- [Contributing](/docs/dev/Contributing) - Coding rules, running tests, adding features
- [Design overview](/docs/dev/design/design) - Architecture and design decisions

For user-facing spec and API, see the [Spec](/docs/spec/intro) docs.
