diff --git a/.github/actions/compile-i18n/action.yml b/.github/actions/compile-i18n/action.yml
new file mode 100644
index 0000000000..9324ff17bf
--- /dev/null
+++ b/.github/actions/compile-i18n/action.yml
@@ -0,0 +1,15 @@
+---
+name: Compile translations
+description: Compile i18n translations and fail on compilation errors.
+
+runs:
+  using: composite
+  steps:
+    - name: 🔤 Compile translations
+      shell: bash
+      run: pnpm intl:build 2>&1 | tee i18n.log
+
+    - name: Check for i18n compilation errors
+      shell: bash
+      run: if grep -q "invalid syntax" "i18n.log"; then echo "\n\nFound compilation
+        errors!\n\n" && exit 1; else echo "\n\nNo compilation errors!\n\n"; fi
diff --git a/.github/actions/setup-expo-project/action.yml b/.github/actions/setup-expo-project/action.yml
new file mode 100644
index 0000000000..1369ba0cb6
--- /dev/null
+++ b/.github/actions/setup-expo-project/action.yml
@@ -0,0 +1,47 @@
+---
+name: Setup Expo Project
+description: Install dependencies and set up the Expo/EAS CLI for a build. Does not check out the repo.
+
+inputs:
+  expo-token:
+    description: Expo token (EXPO_TOKEN secret)
+    required: true
+  eas-version:
+    description: EAS CLI version to install
+    required: false
+    default: '19.0.5'
+
+runs:
+  using: composite
+  steps:
+    - name: Check for EXPO_TOKEN
+      shell: bash
+      env:
+        EXPO_TOKEN: ${{ inputs.expo-token }}
+      run: >
+        if [ -z "$EXPO_TOKEN" ]; then
+          echo "You must provide an EXPO_TOKEN secret linked to this project's Expo account in this repo's secrets. Learn more: https://docs.expo.dev/eas-update/github-actions"
+          exit 1
+        fi
+
+    - uses: pnpm/action-setup@0ebf47130e4866e96fce0953f49152a61190b271 # v6.0.9
+
+    - name: 🔧 Setup Node
+      uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+      with:
+        node-version-file: package.json
+        cache: pnpm
+
+    - name: 🪛 Setup jq
+      uses: dcarbone/install-jq-action@4fcb5062d7ce9bc4382d1a352d19ba3ba2c317c1 # v4.0.1
+
+    - name: ⚙️ Install dependencies
+      shell: bash
+      run: pnpm install --frozen-lockfile
+
+    - name: 🔨 Setup Expo CLI
+      uses: expo/expo-github-action@eab7a230208c952974db8c3245cfd78402c7b385 # 9.0.0
+      with:
+        eas-version: ${{ inputs.eas-version }}
+        packager: 'pnpm --allow-build=dtrace-provider'
+        token: ${{ inputs.expo-token }}
diff --git a/.github/actions/write-env/action.yml b/.github/actions/write-env/action.yml
new file mode 100644
index 0000000000..7cb3464188
--- /dev/null
+++ b/.github/actions/write-env/action.yml
@@ -0,0 +1,63 @@
+---
+name: Write Environment Variables
+description: Write the .env file and google-services.json used by the build.
+
+inputs:
+  env-token:
+    description: Base .env contents (ENV_TOKEN secret)
+    required: true
+  sentry-dsn:
+    description: Sentry DSN (SENTRY_DSN secret)
+    required: true
+  bitdrift-api-key:
+    description: Bitdrift API key (BITDRIFT_API_KEY secret)
+    required: true
+  gcp-project-id:
+    description: GCP project ID (EXPO_PUBLIC_GCP_PROJECT_ID secret)
+    required: true
+  google-services-token:
+    description: google-services.json contents (GOOGLE_SERVICES_TOKEN secret)
+    required: true
+  expo-public-env:
+    description: >
+      EXPO_PUBLIC_ENV value. Only set for OTA deploys where eas.json isn't used;
+      for regular builds this is normally handled in eas.json.
+    required: false
+    default: ''
+
+outputs:
+  release-version:
+    description: Version from package.json
+    value: ${{ steps.env.outputs.release-version }}
+  bundle-identifier:
+    description: git SHA of HEAD
+    value: ${{ steps.env.outputs.bundle-identifier }}
+
+runs:
+  using: composite
+  steps:
+    - name: ✏️ Write environment variables
+      id: env
+      shell: bash
+      env:
+        ENV_TOKEN: ${{ inputs.env-token }}
+        SENTRY_DSN: ${{ inputs.sentry-dsn }}
+        BITDRIFT_API_KEY: ${{ inputs.bitdrift-api-key }}
+        GCP_PROJECT_ID: ${{ inputs.gcp-project-id }}
+        GOOGLE_SERVICES_TOKEN: ${{ inputs.google-services-token }}
+        EXPO_PUBLIC_ENV: ${{ inputs.expo-public-env }}
+      run: |
+        echo "$ENV_TOKEN" > .env
+        # EXPO_PUBLIC_ENV is normally handled in eas.json; only written here for OTA deploys.
+        if [ -n "$EXPO_PUBLIC_ENV" ]; then
+          echo "EXPO_PUBLIC_ENV=$EXPO_PUBLIC_ENV" >> .env
+        fi
+        echo "EXPO_PUBLIC_RELEASE_VERSION=$(jq -r '.version' package.json)" >> .env
+        echo "release-version=$(jq -r '.version' package.json)" >> $GITHUB_OUTPUT
+        echo "EXPO_PUBLIC_BUNDLE_IDENTIFIER=$(git rev-parse HEAD)" >> .env
+        echo "bundle-identifier=$(git rev-parse HEAD)" >> $GITHUB_OUTPUT
+        echo "EXPO_PUBLIC_BUNDLE_DATE=$(date -u +"%y%m%d%H")" >> .env
+        echo "EXPO_PUBLIC_SENTRY_DSN=$SENTRY_DSN" >> .env
+        echo "EXPO_PUBLIC_BITDRIFT_API_KEY=$BITDRIFT_API_KEY" >> .env
+        echo "EXPO_PUBLIC_GCP_PROJECT_ID=$GCP_PROJECT_ID" >> .env
+        echo "$GOOGLE_SERVICES_TOKEN" > google-services.json