diff --git a/.github/actions/setup-deps/action.yml b/.github/actions/setup-deps/action.yml
new file mode 100644
index 0000000..055a0a1
--- /dev/null
+++ b/.github/actions/setup-deps/action.yml
@@ -0,0 +1,17 @@
+name: Setup dependencies
+
+on:
+  workflow_call
+
+runs:
+  using: 'composite'
+  steps:
+    - uses: pnpm/action-setup@v4
+      with:
+        package_json_file: './package.json'
+    - uses: actions/setup-node@v4
+      with:
+        node-version-file: '.node-version'
+        cache: 'pnpm'
+    - run: pnpm install
+      shell: bash
diff --git a/.github/workflows/common-ci.yml b/.github/workflows/common-ci.yml
new file mode 100644
index 0000000..77a9f38
--- /dev/null
+++ b/.github/workflows/common-ci.yml
@@ -0,0 +1,33 @@
+name: common
+
+on:
+  pull_request:
+    paths:
+      - 'modules/common/**'
+      - '.github/workflows/common-ci.yml'
+
+defaults:
+  run:
+    working-directory: modules/common
+
+jobs:
+  typecheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: './.github/actions/setup-deps'
+      - run: pnpm run typecheck
+
+  unit-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: './.github/actions/setup-deps'
+      - run: pnpm run test:unit
+
+  db-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: './.github/actions/setup-deps'
+      - run: pnpm run test:db
diff --git a/.github/workflows/mobile-ci.yml b/.github/workflows/mobile-ci.yml
new file mode 100644
index 0000000..25dca6c
--- /dev/null
+++ b/.github/workflows/mobile-ci.yml
@@ -0,0 +1,20 @@
+name: mobile
+
+on:
+  pull_request:
+    paths:
+      - 'services/mobile/**'
+      - 'modules/common/**'
+      - '.github/workflows/mobile-ci.yml'
+
+defaults:
+  run:
+    working-directory: services/mobile
+
+jobs:
+  typecheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: './.github/actions/setup-deps'
+      - run: pnpm run typecheck
diff --git a/.github/workflows/pos-ci.yml b/.github/workflows/pos-ci.yml
new file mode 100644
index 0000000..9dc03eb
--- /dev/null
+++ b/.github/workflows/pos-ci.yml
@@ -0,0 +1,20 @@
+name: pos
+
+on:
+  pull_request:
+    paths:
+      - 'services/pos/**'
+      - 'modules/common/**'
+      - '.github/workflows/common-ci.yml'
+
+defaults:
+  run:
+    working-directory: services/pos
+
+jobs:
+  typecheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: './.github/actions/setup-deps'
+      - run: pnpm run typecheck
diff --git a/.husky/pre-commit b/.husky/pre-commit
index deb6975..a135630 100755
--- a/.husky/pre-commit
+++ b/.husky/pre-commit
@@ -2,3 +2,9 @@
 . "$(dirname -- "$0")/_/husky.sh"
 
 pnpm fmt
+retval=$?
+
+if [ $retval -ne 0 ]
+then
+  exit 1
+fi
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 9249e49..41d17ad 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -57,6 +57,9 @@ importers:
 
   services/mobile:
     dependencies:
+      '@cafeore/common':
+        specifier: workspace:*
+        version: link:../../modules/common
       '@remix-run/cloudflare':
         specifier: ^2.13.1
         version: 2.15.3(@cloudflare/workers-types@4.20250129.0)(typescript@5.7.3)
@@ -66,6 +69,9 @@ importers:
       '@remix-run/react':
         specifier: ^2.13.1
         version: 2.15.3(react-dom@18.3.1(react@18.3.1))(react@18.3.1)(typescript@5.7.3)
+      clsx:
+        specifier: ^2.1.1
+        version: 2.1.1
       isbot:
         specifier: ^5.1.17
         version: 5.1.22
@@ -81,6 +87,9 @@ importers:
       swr:
         specifier: ^2.2.5
         version: 2.3.0(react@18.3.1)
+      tailwind-merge:
+        specifier: ^2.5.4
+        version: 2.6.0
     devDependencies:
       '@cloudflare/workers-types':
         specifier: ^4.20241022.0
diff --git a/services/mobile/app/routes/welcome._index.tsx b/services/mobile/app/routes/welcome._index.tsx
index 869db55..536e5c5 100644
--- a/services/mobile/app/routes/welcome._index.tsx
+++ b/services/mobile/app/routes/welcome._index.tsx
@@ -1,10 +1,9 @@
+import { documentSub, orderConverter } from "@cafeore/common";
 import {
   isRouteErrorResponse,
   useRouteError,
   useSearchParams,
 } from "@remix-run/react";
-import { orderConverter } from "common/firebase-utils/converter";
-import { documentSub } from "common/firebase-utils/subscription";
 import { useEffect, useRef, useState } from "react";
 import useSWRSubscription from "swr/subscription";
 import bellSound from "~/assets/bell.mp3";
diff --git a/services/mobile/package.json b/services/mobile/package.json
index 58918bd..1f0119f 100644
--- a/services/mobile/package.json
+++ b/services/mobile/package.json
@@ -12,14 +12,17 @@
     "typegen": "wrangler types"
   },
   "dependencies": {
+    "@cafeore/common": "workspace:*",
     "@remix-run/cloudflare": "^2.13.1",
     "@remix-run/cloudflare-pages": "^2.13.1",
     "@remix-run/react": "^2.13.1",
+    "clsx": "^2.1.1",
     "isbot": "^5.1.17",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "react-icons": "^5.3.0",
-    "swr": "^2.2.5"
+    "swr": "^2.2.5",
+    "tailwind-merge": "^2.5.4"
   },
   "devDependencies": {
     "@cloudflare/workers-types": "^4.20241022.0",