diff --git a/.claude/settings.json b/.claude/settings.json
new file mode 120000
index 0000000..0915a23
--- /dev/null
+++ b/.claude/settings.json
@@ -0,0 +1 @@
+../way/settings/backend/settings.json
\ No newline at end of file
diff --git a/.claude/skills b/.claude/skills
new file mode 120000
index 0000000..e839045
--- /dev/null
+++ b/.claude/skills
@@ -0,0 +1 @@
+../way/skills/backend
\ No newline at end of file
diff --git a/.codex/AGENTS.md b/.codex/AGENTS.md
new file mode 120000
index 0000000..5ac27ca
--- /dev/null
+++ b/.codex/AGENTS.md
@@ -0,0 +1 @@
+../way/instructing/backend/AGENTS.md
\ No newline at end of file
diff --git a/.codex/config.toml b/.codex/config.toml
new file mode 120000
index 0000000..36ade79
--- /dev/null
+++ b/.codex/config.toml
@@ -0,0 +1 @@
+../way/settings/backend/config.toml
\ No newline at end of file
diff --git a/.codex/skills b/.codex/skills
new file mode 120000
index 0000000..e839045
--- /dev/null
+++ b/.codex/skills
@@ -0,0 +1 @@
+../way/skills/backend
\ No newline at end of file
diff --git a/.dockerignore b/.dockerignore
deleted file mode 100644
index a0d98cc..0000000
--- a/.dockerignore
+++ /dev/null
@@ -1,13 +0,0 @@
-.claude/
-.git/
-.github/
-.serena/
-
-.dockerignore
-.env*
-.gitignore
-.mcp.json
-CLAUDE.md
-Dockerfile
-mise.toml
-Taskfile.yaml
diff --git a/.dockerignore b/.dockerignore
new file mode 120000
index 0000000..c20213b
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1 @@
+./way/packaging/backend/.dockerignore
\ No newline at end of file
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
deleted file mode 100644
index d553a78..0000000
--- a/.github/workflows/ci.yaml
+++ /dev/null
@@ -1,26 +0,0 @@
-name: CI
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-    branches:
-      - main
-    types:
-      - opened
-      - ready_for_review
-      - reopened
-      - synchronize
-  workflow_dispatch:
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-jobs:
-  test:
-    if: github.event.pull_request.draft == false
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v6
-      - uses: jdx/mise-action@v3
-      - name: Test
-        run: task test
diff --git a/.github/workflows/cd.yaml b/.github/workflows/deploy.yml
similarity index 55%
rename from .github/workflows/cd.yaml
rename to .github/workflows/deploy.yml
index 8da818e..66c59d5 100644
--- a/.github/workflows/cd.yaml
+++ b/.github/workflows/deploy.yml
@@ -1,4 +1,4 @@
-name: CD
+name: Deploy
 on:
   push:
     branches:
@@ -15,7 +15,7 @@ on:
           - qa
           - prod
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.event.inputs.environment_name }}
+  group: ${{ github.repository }}-${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}-${{ github.event.inputs.environment_name }}
   cancel-in-progress: true
 jobs:
   set-env:
@@ -26,40 +26,11 @@ jobs:
       image_tag: ${{ steps.set-env.outputs.image_tag }}
     steps:
       - uses: actions/checkout@v6
-      - name: Set Environmet
-        id: set-env
-        run: |
-          # Environment
-          IS_WORKFLOW_DISPATCH="${{ github.event_name == 'workflow_dispatch' && github.event.inputs.environment_name != '' }}"
-          IS_PUSH_TO_MAIN="${{ github.event_name == 'push' && (github.ref == 'refs/heads/main' || github.base_ref == 'main') }}"
-          if [ $IS_WORKFLOW_DISPATCH = "true" ]; then
-            export TARGET_ENVIRONMENT="${{ github.event.inputs.environment_name }}"
-          elif [ $IS_PUSH_TO_MAIN = "true" ]; then
-            export TARGET_ENVIRONMENT="stg"
-          else
-            exit 1
-          fi
-
-          echo "Environment: $TARGET_ENVIRONMENT"
-
-          # Service name suffix
-          if [ "$TARGET_ENVIRONMENT" = "prod" ]; then
-            export SERVICE_NAME_SUFFIX=""
-          else
-            export SERVICE_NAME_SUFFIX="-$TARGET_ENVIRONMENT"
-          fi
-
-          export REPO_NAME=$(echo ${{ github.repository }} | awk -F '/' '{print $2}')
-          export SERVICE_NAME=$REPO_NAME$SERVICE_NAME_SUFFIX
-          export IMAGE_TAG=${{ vars._AR_HOSTNAME }}/${{ vars.PROJECT_ID }}/github-actions/$REPO_NAME/$SERVICE_NAME:${{ github.sha }}
-
-          echo "Repository name: $REPO_NAME"
-          echo "Service name: $SERVICE_NAME"
-          echo "Image tag: $IMAGE_TAG"
-
-          echo "environment=$TARGET_ENVIRONMENT" >> "$GITHUB_OUTPUT"
-          echo "service_name=$SERVICE_NAME" >> "$GITHUB_OUTPUT"
-          echo "image_tag=$IMAGE_TAG" >> "$GITHUB_OUTPUT"
+      - id: set-env
+        uses: fun-dotto/way/.github/actions/set-env@main
+        with:
+          ar_hostname: ${{ vars._AR_HOSTNAME }}
+          project_id: ${{ vars.PROJECT_ID }}
   build-and-push:
     runs-on: ubuntu-latest
     permissions:
@@ -72,6 +43,9 @@ jobs:
       - set-env
     steps:
       - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+          submodules: true
       - name: Build
         run: |
           docker build \
@@ -79,14 +53,11 @@ jobs:
           . \
           -f Dockerfile \
           --no-cache
-      - name: Authenticate
-        id: auth
-        uses: google-github-actions/auth@v2
+      - uses: google-github-actions/auth@v3
         with:
           workload_identity_provider: ${{ vars.WORKLOAD_IDENTITY_PROVIDER }}
           service_account: ${{ vars.SERVICE_ACCOUNT }}
-      - name: Setup Google Cloud
-        uses: google-github-actions/setup-gcloud@v2
+      - uses: google-github-actions/setup-gcloud@v3
         with:
           project_id: ${{ vars.PROJECT_ID }}
       - name: Configure Docker
@@ -110,15 +81,11 @@ jobs:
       - set-env
       - build-and-push
     steps:
-      - name: Authenticate
-        id: auth
-        uses: google-github-actions/auth@v2
+      - uses: google-github-actions/auth@v3
         with:
           workload_identity_provider: ${{ vars.WORKLOAD_IDENTITY_PROVIDER }}
           service_account: ${{ vars.SERVICE_ACCOUNT }}
-      - name: Deploy
-        id: deploy
-        uses: google-github-actions/deploy-cloudrun@v2
+      - uses: google-github-actions/deploy-cloudrun@v3
         with:
           service: ${{ env.SERVICE_NAME }}
           image: ${{ env.IMAGE_TAG }}
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..e324330
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,20 @@
+name: Test
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+    types:
+      - opened
+      - ready_for_review
+      - reopened
+      - synchronize
+  workflow_dispatch:
+jobs:
+  test:
+    uses: fun-dotto/way/.github/workflows/backend-test.yml@main
+    permissions:
+      contents: read
+    secrets: inherit
diff --git a/.github/workflows/update-submodules.yml b/.github/workflows/update-submodules.yml
new file mode 100644
index 0000000..1608c62
--- /dev/null
+++ b/.github/workflows/update-submodules.yml
@@ -0,0 +1,11 @@
+name: Update Submodules
+on:
+  schedule:
+    - cron: "0 15 * * *"
+  workflow_dispatch:
+jobs:
+  update-submodules:
+    uses: fun-dotto/way/.github/workflows/update-submodules.yml@main
+    permissions:
+      contents: write
+      pull-requests: write
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..1fe8a39
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "way"]
+	path = way
+	url = git@github.com:fun-dotto/way.git
diff --git a/.mcp.json b/.mcp.json
deleted file mode 100644
index b874e8f..0000000
--- a/.mcp.json
+++ /dev/null
@@ -1,16 +0,0 @@
-{
-  "mcpServers": {
-    "notion": {
-      "url": "https://mcp.notion.com/mcp",
-      "type": "http"
-    },
-    "serena": {
-      "command": "uvx",
-      "args": [
-        "--from",
-        "git+https://github.com/oraios/serena.git",
-        "serena-mcp-server"
-      ]
-    }
-  }
-}
diff --git a/.mcp.json b/.mcp.json
new file mode 120000
index 0000000..f62d0e2
--- /dev/null
+++ b/.mcp.json
@@ -0,0 +1 @@
+./way/settings/backend/.mcp.json
\ No newline at end of file
diff --git a/CLAUDE.md b/CLAUDE.md
deleted file mode 100644
index f6a2933..0000000
--- a/CLAUDE.md
+++ /dev/null
@@ -1,24 +0,0 @@
-# CLAUDE.md
-
-このファイルは、Claude Code (claude.ai/code) がこのリポジトリで作業する際のガイダンスを提供します。
-
-## ドキュメント
-
-Notion MCP を使用して Notion を参照
-
-## 開発コマンド
-
-[`Taskfile.yml`](Taskfile.yml) を参照
-
-## アーキテクチャ
-
-Clean Architecture を採用
-
-## ルール
-
-- DRY 原則を遵守する
-- SOLID 原則を遵守する
-- 機能を新規に実装する・リファクタリングする場合は、[アーキテクチャパターン](https://www.notion.so/fun-dotto/30428560ac7980d5a870e9dc9f5695bd?source=copy_link)に則って実装する
-- [ブランチの運用ルール](https://www.notion.so/fun-dotto/Branch-30428560ac79801a9429dd67cf30b7f9?source=copy_link)に従う
-- [コミットルール](https://www.notion.so/fun-dotto/Commit-30428560ac798065bb4ecd14baab9e2e?source=copy_link)に従う
-- [Pull Request の運用ルール](https://www.notion.so/fun-dotto/Pull-Request-30428560ac7980e98efce3c11d36ebb5?source=copy_link)に従う
diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 120000
index 0000000..a7a1e83
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1 @@
+./way/instructing/backend/CLAUDE.md
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
deleted file mode 100644
index 2363efb..0000000
--- a/Dockerfile
+++ /dev/null
@@ -1,53 +0,0 @@
-# Build stage
-FROM golang:1.25.6-alpine AS builder
-
-# Install build dependencies
-RUN apk add --no-cache git
-
-# Set working directory
-WORKDIR /app
-
-# Copy go mod files
-COPY go.mod go.sum ./
-
-# Download dependencies
-RUN go mod download
-
-# Copy source code
-COPY . .
-
-# Build the application
-RUN CGO_ENABLED=0 GOOS=linux go build -tags timetzdata -o ./bin/main ./cmd/server/main.go
-
-# Runtime stage
-FROM alpine:3
-
-ENV PORT=8080
-
-# Install runtime dependencies
-RUN apk add --no-cache ca-certificates
-
-# Create non-root user
-RUN addgroup -g 1000 appuser && \
-    adduser -D -u 1000 -G appuser appuser
-
-# Set working directory
-WORKDIR /app
-
-# Copy binary from builder
-COPY --from=builder /app/bin/main /app/main
-
-# Copy OpenAPI spec
-COPY --from=builder /app/openapi /app/openapi
-
-# Change ownership
-RUN chown -R appuser:appuser /app
-
-# Switch to non-root user
-USER appuser
-
-# Expose port
-EXPOSE $PORT
-
-# Run the application
-CMD ["/app/main"]
diff --git a/Dockerfile b/Dockerfile
new file mode 120000
index 0000000..ebdd815
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1 @@
+./way/packaging/backend/Dockerfile
\ No newline at end of file
diff --git a/Taskfile.yaml b/Taskfile.yaml
deleted file mode 100644
index c5190c9..0000000
--- a/Taskfile.yaml
+++ /dev/null
@@ -1,56 +0,0 @@
-version: "3"
-
-vars:
-  GO: go
-
-tasks:
-  install:
-    desc: Install dependencies
-    cmds:
-      - "{{.GO}} mod tidy"
-
-  generate:
-    desc: Generate API code from OpenAPI spec
-    cmds:
-      - rm -rf ./generated
-      - mkdir -p ./generated
-      - "{{.GO}} tool oapi-codegen -config ./openapi/config.yaml ./openapi/openapi.yaml"
-      - "{{.GO}} tool oapi-codegen -config ./openapi/external/academic_api/config.yaml ./openapi/external/academic_api/openapi.yaml"
-      - "{{.GO}} tool oapi-codegen -config ./openapi/external/announcement_api/config.yaml ./openapi/external/announcement_api/openapi.yaml"
-      - "{{.GO}} tool oapi-codegen -config ./openapi/external/funch_api/config.yaml ./openapi/external/funch_api/openapi.yaml"
-      - "{{.GO}} tool oapi-codegen -config ./openapi/external/user_api/config.yaml ./openapi/external/user_api/openapi.yaml"
-
-  clean:
-    desc: Clean build artifacts
-    cmds:
-      - rm -rf ./bin
-
-  build:
-    desc: Build the application
-    deps:
-      - clean
-    cmds:
-      - mkdir -p ./bin
-      - "{{.GO}} build -tags timetzdata -o ./bin/main ./cmd/server/main.go"
-
-  run:
-    desc: Run the application
-    cmds:
-      - "{{.GO}} run ./cmd/server/main.go"
-
-  build-and-run:
-    desc: Build and run the application
-    deps:
-      - build
-    cmds:
-      - ./bin/main
-
-  test:
-    desc: Run tests
-    cmds:
-      - "{{.GO}} test -v ./..."
-
-  default:
-    desc: Show available tasks
-    cmds:
-      - task --list
diff --git a/Taskfile.yml b/Taskfile.yml
new file mode 120000
index 0000000..71ba9b7
--- /dev/null
+++ b/Taskfile.yml
@@ -0,0 +1 @@
+./way/tooling/backend/Taskfile.yml
\ No newline at end of file
diff --git a/mise.toml b/mise.toml
deleted file mode 100644
index 5086832..0000000
--- a/mise.toml
+++ /dev/null
@@ -1,3 +0,0 @@
-[tools]
-"aqua:go-task/task" = "latest"
-go = "1.25.6"
diff --git a/mise.toml b/mise.toml
new file mode 120000
index 0000000..f20b12d
--- /dev/null
+++ b/mise.toml
@@ -0,0 +1 @@
+./way/tooling/backend/mise.toml
\ No newline at end of file
diff --git a/way b/way
new file mode 160000
index 0000000..2836537
--- /dev/null
+++ b/way
@@ -0,0 +1 @@
+Subproject commit 28365378a640746fd364103f28b687ee6b2ffab9