diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 644da68..e74e57e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,18 +10,32 @@ on:
       - main
       - "release/**"
 
+permissions:
+  contents: read
+
 jobs:
   fmt:
     name: Check Formatting (hexaGenMini)
     runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: firmware
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
+      # Toolchain + components (rustfmt, clippy) + RP2040 target
       - name: Install Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt,clippy
+          targets: thumbv6m-none-eabi
+
+      # Cache to speed up builds
+      - name: Cache cargo
+        uses: Swatinem/rust-cache@v2
         with:
-          toolchain: stable
-          override: true
+          workspaces: |
+            firmware
 
       - name: Check code formatting
         run: cargo fmt -- --check
@@ -29,44 +43,72 @@ jobs:
   clippy:
     name: Run Clippy Linter (hexaGenMini)
     runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: firmware
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+          targets: thumbv6m-none-eabi
+
+      - name: Cache cargo
+        uses: Swatinem/rust-cache@v2
         with:
-          toolchain: stable
-          override: true
+          workspaces: |
+            firmware
 
-      - name: Run Clippy
-        run: cargo clippy --all-targets --all-features -- -D warnings
+      - name: Run Clippy (RP2040 target)
+        run: cargo clippy --target thumbv6m-none-eabi -- -D warnings
 
   build:
-    name: Build Project (hexaGenMini)
+    name: Build (hexaGenMini)
     runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: firmware
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: stable
-          override: true
+          targets: thumbv6m-none-eabi
 
-      - name: Build
-        run: cargo build --locked --all-targets
+      - name: Cache cargo
+        uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: |
+            firmware
+
+      # Eğer projenizde extra llvm-tools vs. gerekiyorsa burada ekleyebilirsiniz
+      # - run: rustup component add llvm-tools-preview
+
+      - name: Build (hexaGenMini)
+        run: cargo build --release --target thumbv6m-none-eabi
 
-  test:
-    name: Run Tests (hexaGenMini)
+  check:
+    name: Check compiles (hexaGenMini)
     runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: firmware
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: thumbv6m-none-eabi
+
+      - name: Cache cargo
+        uses: Swatinem/rust-cache@v2
         with:
-          toolchain: stable
-          override: true
+          workspaces: |
+            firmware
 
-      - name: Run tests
-        run: cargo test --locked --all-targets
+      - name: Cargo check (RP2040 target)
+        run: cargo check --target thumbv6m-none-eabi
diff --git a/.github/workflows/commitlint.yml b/.github/workflows/commitlint.yml
index 865b751..bd7cdf9 100644
--- a/.github/workflows/commitlint.yml
+++ b/.github/workflows/commitlint.yml
@@ -17,5 +17,5 @@ jobs:
       - name: Lint commits
         uses: wagoid/commitlint-github-action@v5
         with:
-          configFile: .commitlintrc.yml
+          configFile: .github/.commitlintrc.yml
           failOnWarnings: true
diff --git a/README.md b/README.md
index 63e1a7c..cca41ed 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,7 @@
-# hexaGenMini
\ No newline at end of file
+<!--
+SPDX-FileCopyrightText: 2025 hexaTune LLC
+SPDX-License-Identifier: MIT
+-->
+
+# hexaGenMini
+
diff --git a/REUSE.toml b/REUSE.toml
index e850e3e..b2b7395 100644
--- a/REUSE.toml
+++ b/REUSE.toml
@@ -1,7 +1,23 @@
 version = 1
 
 [[annotations]]
-path = ["package.json", "CHANGELOG.md"]
+path = ["package.json", "CHANGELOG.md", ".gitignore", "docs/CNAME"]
+precedence = "aggregate"
+SPDX-FileCopyrightText = "2025 hexaTune LLC"
+SPDX-License-Identifier = "MIT"
+
+[[annotations]]
+path = ["hardware/**", "mechanic/**"]
+precedence = "aggregate"
+SPDX-FileCopyrightText = "2025 hexaTune LLC"
+SPDX-License-Identifier = "MIT"
+
+[[annotations]]
+path = [
+  "firmware/.cargo/config.toml",
+  "firmware/Cargo.lock",
+  "firmware/memory.x",
+]
 precedence = "aggregate"
 SPDX-FileCopyrightText = "2025 hexaTune LLC"
 SPDX-License-Identifier = "MIT"
diff --git a/firmware/Makefile b/firmware/Makefile
index e9aadc7..39bb0f2 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2025 hexaTune LLC
+# SPDX-License-Identifier: MIT
 # ===== User config =====
 BIN        ?= hexagenmini
 TRIPLE     ?= thumbv6m-none-eabi
diff --git a/firmware/build.rs b/firmware/build.rs
index 3f915f9..0e0de19 100644
--- a/firmware/build.rs
+++ b/firmware/build.rs
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2025 hexaTune LLC
+// SPDX-License-Identifier: MIT
+
 //! This build script copies the `memory.x` file from the crate root into
 //! a directory where the linker can always find it at build time.
 //! For many projects this is optional, as the linker always searches the
diff --git a/firmware/src/main.rs b/firmware/src/main.rs
index d6d6e9c..8caf0f5 100644
--- a/firmware/src/main.rs
+++ b/firmware/src/main.rs
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2025 hexaTune LLC
+// SPDX-License-Identifier: MIT
+
 #![no_std]
 #![no_main]
 
diff --git a/firmware/src/usb/mod.rs b/firmware/src/usb/mod.rs
index 54ecc15..62cd45c 100644
--- a/firmware/src/usb/mod.rs
+++ b/firmware/src/usb/mod.rs
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2025 hexaTune LLC
+// SPDX-License-Identifier: MIT
+
 use defmt::info;
 use embassy_usb::class::midi::MidiClass;
 use embassy_usb::{Builder, Config};