diff --git a/mobile/App.tsx b/mobile/App.tsx
index 2f97f5f..50094d1 100644
--- a/mobile/App.tsx
+++ b/mobile/App.tsx
@@ -1,24 +1,10 @@
-import { StatusBar } from 'expo-status-bar';
-import { StyleSheet, Text, View } from 'react-native';
+import { AuthProvider } from './context/AuthContext';
+import Index from './app/index.jsx';
 
 export default function App() {
   return (
-    <View style={styles.container}>
-      <Text style={styles.title}>Dot.</Text>
-      <StatusBar style="auto" />
-    </View>
+    <AuthProvider>
+      <Index />
+    </AuthProvider>
   );
-}
-
-const styles = StyleSheet.create({
-  container: {
-    flex: 1,
-    backgroundColor: '#fff',
-    alignItems: 'center',
-    justifyContent: 'center',
-  },
-  title: {
-    fontSize: 32,
-    fontWeight: '600',
-  },
-});
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/mobile/app/index.jsx b/mobile/app/index.jsx
new file mode 100644
index 0000000..581c659
--- /dev/null
+++ b/mobile/app/index.jsx
@@ -0,0 +1,24 @@
+import { StatusBar } from 'expo-status-bar';
+import { StyleSheet, Text, View } from 'react-native';
+
+export default function Index() {
+  return (
+    <View style={styles.container}>
+      <Text style={styles.title}>Dot.</Text>
+      <StatusBar style="auto" />
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: '#fff',
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
+  title: {
+    fontSize: 32,
+    fontWeight: '600',
+  },
+});
\ No newline at end of file
diff --git a/mobile/context/AuthContext.jsx b/mobile/context/AuthContext.jsx
new file mode 100644
index 0000000..03d8be6
--- /dev/null
+++ b/mobile/context/AuthContext.jsx
@@ -0,0 +1,27 @@
+import { createContext, useCallback, useContext, useMemo, useState } from 'react';
+
+const AuthContext = createContext(null);
+
+export function AuthProvider({ children }) {
+  const [user, setUser] = useState(null);
+
+  const signIn = useCallback(async (token, profile) => {
+    setUser({ token, profile });
+  }, []);
+
+  const signOut = useCallback(() => {
+    setUser(null);
+  }, []);
+
+  const value = useMemo(() => ({ user, signIn, signOut }), [user, signIn, signOut]);
+
+  return <AuthContext.Provider value={value}>{children}</AuthContext.Provider>;
+}
+
+export function useAuth() {
+  const ctx = useContext(AuthContext);
+  if (!ctx) {
+    throw new Error('useAuth must be used within an AuthProvider');
+  }
+  return ctx;
+}
\ No newline at end of file