diff --git a/docs/CONTRIBUTING.md b/docs/CONTRIBUTING.md
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+++ b/docs/CONTRIBUTING.md
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+# RapidRAW — Developer Guide
+
+---
+
+## Development Environment Setup
+
+### Prerequisites
+
+| Tool | Version | Notes |
+|------|---------|-------|
+| **Rust** | 1.94.0 (pinned via `../src-tauri/rust-toolchain.toml`) | Install via [rustup](https://rustup.rs/) |
+| **Node.js** | ≥ 18 LTS | For the React frontend |
+
+### Platform Dependencies
+
+**macOS:** `xcode-select --install`
+
+**Linux:**
+```bash
+sudo apt-get install -y libwebkit2gtk-4.1-dev libssl-dev \
+    libayatana-appindicator3-dev librsvg2-dev
+```
+
+**Windows:** [Visual Studio Build Tools](https://visualstudio.microsoft.com/visual-cpp-build-tools/) with "Desktop development with C++"
+
+### First Run
+
+```bash
+git clone https://github.com/CyberTimon/RapidRAW.git && cd RapidRAW
+npm install
+npm start   # runs `tauri dev` — launches Vite on :1420 + compiles Rust backend
+```
+
+> **Note:** First build takes **5–10 minutes** (large Rust dependency tree). The build script also auto-downloads the ONNX Runtime binary for your platform via `../src-tauri/build.rs`. Incremental rebuilds are fast.
+
+---
+
+## Architecture Overview
+
+![RapidRAW Architecture](img/architecture.excalidraw.png)
+
+All mutable backend state lives in a single `AppState` struct (in `../src-tauri/src/lib.rs`), accessed via `tauri::State<AppState>`. Key fields include caches for the loaded image, GPU textures, masks, LUTs, and AI models — all behind `Mutex` or `Arc`.
+
+---
+
+## Project Structure
+
+```
+../src/                           # FRONTEND
+├── App.tsx                       # Root component (~202KB — manages nearly all state)
+├── components/
+│   ├── adjustments/              # Slider UIs: Basic, Color, Curves, Details, Effects
+│   ├── modals/                   # Dialogs: export, panorama, HDR, denoise, etc.
+│   ├── panel/
+│   │   ├── Editor.tsx            # Main editor layout
+│   │   ├── MainLibrary.tsx       # Library grid view
+│   │   ├── editor/
+│   │   │   ├── ImageCanvas.tsx   # Core image display + zoom/pan
+│   │   │   └── Waveform.tsx      # Histogram / waveform / vectorscope
+│   │   └── right/                # Right panel tabs: Controls, Masks, AI, Presets, Export, Crop, Metadata
+│   └── ui/                       # Reusable primitives: Slider, Button, ColorWheel, etc.
+├── hooks/                        # useHistoryState, useKeyboardShortcuts, usePresets, etc.
+├── utils/
+│   ├── adjustments.tsx           # ⭐ Adjustment types, interfaces & defaults
+│   ├── frontendLogBridge.ts      # Forwards console.* → Rust log file
+│   └── themes.tsx, ImageLRUCache.ts, etc.
+└── context/                      # Right-click context menus
+
+../src-tauri/src/                 # BACKEND
+├── lib.rs                        # ⭐ Core: AppState, all Tauri commands, app builder
+├── gpu_processing.rs             # wgpu device init, compute pipeline dispatch
+├── image_processing.rs           # CPU transforms, AllAdjustments repr(C) struct
+├── file_management.rs            # File I/O, sidecars, thumbnails, presets
+├── ai_processing.rs              # ONNX inference (SAM2, U2Net, CLIP, LaMa, DepthAnything)
+├── mask_generation.rs            # Mask bitmap generation from definitions
+├── raw_processing.rs             # rawler RAW → DynamicImage
+├── exif_processing.rs            # EXIF metadata extraction
+├── lens_correction.rs            # Lensfun database & correction
+├── denoising.rs, tagging.rs, culling.rs, etc.
+└── shaders/
+    ├── shader.wgsl               # ⭐ Main image processing shader (61KB)
+    ├── blur.wgsl                 # Gaussian blur compute shader
+    └── flare.wgsl                # Lens flare effect
+```
+
+---
+
+## How an Edit Works (Data Flow)
+
+1. User drags a slider → React updates adjustment state in `../src/App.tsx`
+2. `invoke('apply_adjustments', { adjustments })` sends JSON to Rust
+3. Rust checks transform hash — **reuses cached transformed image** if crop/rotate/flip unchanged
+4. Adjustment JSON is deserialized into `AllAdjustments` (a `repr(C)` struct) and uploaded as a GPU uniform buffer
+5. wgpu dispatches the compute shader, which processes all adjustments in one pass
+6. Resulting RGBA8 pixels are read back and JPEG-encoded for the frontend
+
+The adjustment model exists in **three synced layers**:
+
+| Layer | File | Format |
+|-------|------|--------|
+| Frontend | `../src/utils/adjustments.tsx` | TypeScript `Adjustments` interface |
+| Backend | `../src-tauri/src/image_processing.rs` | `AllAdjustments` `#[repr(C)]` struct |
+| GPU | `../src-tauri/src/shaders/shader.wgsl` | WGSL uniform struct |
+
+> **Important:** Adding a new adjustment requires changes in **all three layers**, with correct `repr(C)` alignment in the Rust struct.
+
+---
+
+## Caching
+
+Performance comes from aggressive caching — when only visual params change, the expensive transform step is skipped:
+
+| Cache | Key | Stores |
+|-------|-----|--------|
+| `full_transformed_cache` | transform hash | Full-res image post-crop/rotate/flip/warp |
+| `gpu_image_cache` | — | GPU texture of current source image |
+| `mask_cache` | mask definition hash | Generated mask bitmaps |
+| `patch_cache` | patch ID | AI inpainting data (avoids re-sending large blobs) |
+| `lut_cache` | file path | Parsed LUT data |
+| `ImageLRUCache` (frontend) | image path | Recently viewed preview images |
+
+---
+
+## Linting & CI
+
+```bash
+# Frontend
+npm run lint          # ESLint
+npm run format:check  # Prettier
+
+# Backend (from src-tauri/)
+cargo fmt --check
+cargo clippy --all-targets --all-features -- -D warnings
+```
+
+CI runs on every push to `main` and every PR — full build matrix across Windows (x64/ARM), macOS (x64/ARM), Ubuntu (22.04/24.04, x64/ARM), and Android.
+
+---
+
+## Common Recipes
+
+### Add a New Slider
+
+1. Add property + default to `Adjustments` / `INITIAL_ADJUSTMENTS` in `../src/utils/adjustments.tsx`
+2. Add `<Slider>` in the appropriate section component (e.g., `../src/components/adjustments/Basic.tsx`)
+3. Add field to `AllAdjustments` in `../src-tauri/src/image_processing.rs` (watch alignment!)
+4. Add uniform field + processing logic in `../src-tauri/src/shaders/shader.wgsl`
+5. Handle backwards compat via `??` in `normalizeLoadedAdjustments`
+
+### Add a New Tauri Command
+
+1. Write `#[tauri::command]` function in the appropriate `.rs` module
+2. Register in the `invoke_handler` at the bottom of `../src-tauri/src/lib.rs`
+3. Call from frontend: `invoke('command_name', { ...args })`
+
+### Debugging
+
+- **Frontend DevTools:** `Cmd+Shift+I` (macOS) / `Ctrl+Shift+I` (Windows/Linux) inside the Tauri window
+- **Backend logs:** `~/.config/RapidRAW/logs/` — all frontend `console.*` calls are also forwarded here via `../src/utils/frontendLogBridge.ts`
+- **GPU backend issues:** Set `WGPU_BACKEND=metal|vulkan|dx12` env var before running
diff --git a/docs/img/architecture.excalidraw b/docs/img/architecture.excalidraw
new file mode 100644
index 000000000..e97568fad
--- /dev/null
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