diff --git a/client/App.tsx b/client/App.tsx
index 8176493..947b824 100644
--- a/client/App.tsx
+++ b/client/App.tsx
@@ -3,11 +3,12 @@ import { Text } from 'react-native';
 import { createNativeStackNavigator } from '@react-navigation/native-stack';
 import { NavigationContainer, NavigationProp } from '@react-navigation/native';
 import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
+import LoginPage from './screens/Login';
 import MedList from './screens/Medication';
 import Home from './assets/home.svg';
 import DocPickerButton from './components/DocPickerButton';
 
-export type ScreenNames = ['BottomNav', 'Landing', 'TEMP-FileUpload'];
+export type ScreenNames = ['BottomNav', 'Landing', 'TEMP-FileUpload', 'Login'];
 export type RootStackParamList = Record<ScreenNames[number], any>;
 export type StackNavigation = NavigationProp<RootStackParamList>;
 
@@ -19,6 +20,11 @@ export default function App() {
   return (
     <NavigationContainer>
       <Stack.Navigator>
+        <Stack.Screen
+          name="Login"
+          options={{ headerShown: true }}
+          component={LoginPage}
+        />
         <Stack.Screen
           name="BottomNav"
           options={{ headerShown: false }}
diff --git a/client/firebase.config.js b/client/firebase.config.js
new file mode 100644
index 0000000..9121b2e
--- /dev/null
+++ b/client/firebase.config.js
@@ -0,0 +1,21 @@
+// Import the functions you need from the SDKs you need
+import { initializeApp } from 'firebase/app';
+import { initializeAuth, getReactNativePersistence } from 'firebase/auth';
+import ReactNativeAsyncStorage from '@react-native-async-storage/async-storage';
+
+// Your web app's Firebase configuration
+// For Firebase JS SDK v7.20.0 and later, measurementId is optional
+const firebaseConfig = {
+  apiKey: 'AIzaSyA8Ox_r-nkPjzvmrqI4uDrBVHuKDUsOKfU',
+  authDomain: 'care-wallet-generate.firebaseapp.com',
+  projectId: 'care-wallet-generate',
+  storageBucket: 'care-wallet-generate.appspot.com',
+  messagingSenderId: '567693879422',
+  appId: '1:567693879422:web:97b722f9c4eb38e484d02f',
+  measurementId: 'G-NW8HWJ14V4'
+};
+
+const app = initializeApp(firebaseConfig);
+export const auth = initializeAuth(app, {
+  persistence: getReactNativePersistence(ReactNativeAsyncStorage)
+});
diff --git a/client/package.json b/client/package.json
index 1833c88..c1dd572 100644
--- a/client/package.json
+++ b/client/package.json
@@ -12,6 +12,8 @@
     "check": "prettier --check ."
   },
   "dependencies": {
+    "@firebase/auth": "^1.5.1",
+    "@react-native-async-storage/async-storage": "^1.21.0",
     "@fortawesome/fontawesome-svg-core": "^6.5.1",
     "@fortawesome/free-brands-svg-icons": "^6.5.1",
     "@fortawesome/free-regular-svg-icons": "^6.5.1",
@@ -25,12 +27,13 @@
     "expo-document-picker": "~11.5.4",
     "expo-file-system": "~15.4.5",
     "expo-status-bar": "~1.6.0",
+    "firebase": "^10.7.2",
     "nativewind": "^2.0.11",
     "react": "18.2.0",
     "react-native": "0.72.6",
     "react-native-safe-area-context": "4.6.3",
-    "react-native-screens": "~3.22.0",
-    "react-native-svg-transformer": "^1.3.0"
+    "react-native-svg-transformer": "^1.3.0",
+    "react-native-screens": "~3.22.0"
   },
   "devDependencies": {
     "@babel/core": "^7.20.0",
diff --git a/client/screens/Landing.tsx b/client/screens/Landing.tsx
new file mode 100644
index 0000000..e69de29
diff --git a/client/screens/Login.tsx b/client/screens/Login.tsx
new file mode 100644
index 0000000..622f17f
--- /dev/null
+++ b/client/screens/Login.tsx
@@ -0,0 +1,70 @@
+import React, { useState } from 'react';
+import { View, TextInput, Button, Alert, StyleSheet } from 'react-native';
+import { logIn } from '../services/auth/login';
+import { signUp } from '../services/auth/signup';
+import {
+  useNavigation,
+  StackActions,
+  useRoute
+} from '@react-navigation/native';
+
+const LoginPage: React.FC = () => {
+  const [email, setEmail] = useState('');
+  const [password, setPassword] = useState('');
+
+  const navigation = useNavigation();
+  const route = useRoute();
+
+  const handleLogin = async () => {
+    if (!email || !password) {
+      Alert.alert('Error', 'Email and password are required');
+      return;
+    }
+    const result = await logIn(email, password);
+    if (typeof result === 'string') {
+      Alert.alert('Login Failed', result.substring(5).replaceAll('-', ' '));
+    } else {
+      Alert.alert('Login Success', 'Welcome back!');
+      // console.log('result: ', result);
+      navigation.navigate('BottomNav');
+    }
+  };
+
+  const handleSignUp = async () => {
+    if (!email || !password) {
+      Alert.alert('Error', 'Email and password are required');
+      return;
+    }
+    const result = await signUp(email, password);
+    if (typeof result === 'string') {
+      Alert.alert('Signup Failed', result.substring(5).replaceAll('-', ' '));
+    } else {
+      Alert.alert('Signup Success', 'Welcome to the app!');
+      // console.log('result: ', result);
+      navigation.navigate('BottomNav');
+    }
+  };
+
+  return (
+    <View className="flex-1 justify-center items-center px-5">
+      <TextInput
+        className="w-full my-2.5 py-2 px-3 border border-gray-300 rounded"
+        value={email}
+        onChangeText={setEmail}
+        placeholder="Email"
+        keyboardType="email-address"
+      />
+      <TextInput
+        className="w-full my-2.5 py-2 px-3 border border-gray-300 rounded"
+        value={password}
+        onChangeText={setPassword}
+        placeholder="Password"
+        secureTextEntry
+      />
+      <Button title="Login" onPress={handleLogin} />
+      <Button title="Sign Up" onPress={handleSignUp} />
+    </View>
+  );
+};
+
+export default LoginPage;
diff --git a/client/services/auth/authState.ts b/client/services/auth/authState.ts
new file mode 100644
index 0000000..d454711
--- /dev/null
+++ b/client/services/auth/authState.ts
@@ -0,0 +1,13 @@
+import { auth } from '../../firebase.config';
+import {
+  onAuthStateChanged as firebaseOnAuthStateChanged,
+  User
+} from 'firebase/auth';
+
+export const onAuthStateChanged = (
+  callback: (user: User | null) => void
+): void => {
+  firebaseOnAuthStateChanged(auth, (user: User | null) => {
+    callback(user);
+  });
+};
diff --git a/client/services/auth/login.ts b/client/services/auth/login.ts
new file mode 100644
index 0000000..9173a18
--- /dev/null
+++ b/client/services/auth/login.ts
@@ -0,0 +1,37 @@
+import { auth } from '../../firebase.config';
+import {
+  createUserWithEmailAndPassword,
+  signInWithEmailAndPassword,
+  User
+} from 'firebase/auth';
+
+export const logIn = async (
+  email: string,
+  password: string
+): Promise<User | string> => {
+  try {
+    const userCredential = await signInWithEmailAndPassword(
+      auth,
+      email,
+      password
+    );
+    return userCredential.user;
+  } catch (error: any) {
+    console.error('Error logging in: ', error.code);
+    if (error.code === 'auth/user-not-found') {
+      try {
+        const newUserCredential = await createUserWithEmailAndPassword(
+          auth,
+          email,
+          password
+        );
+        return newUserCredential.user;
+      } catch (creationError: any) {
+        console.error('Error creating user: ', creationError.code);
+        return creationError.code;
+      }
+    } else {
+      return error.code;
+    }
+  }
+};
diff --git a/client/services/auth/signup.ts b/client/services/auth/signup.ts
new file mode 100644
index 0000000..4e13d70
--- /dev/null
+++ b/client/services/auth/signup.ts
@@ -0,0 +1,20 @@
+import { auth } from '../../firebase.config';
+import { User } from 'firebase/auth';
+import { createUserWithEmailAndPassword } from 'firebase/auth';
+
+export const signUp = async (
+  email: string,
+  password: string
+): Promise<User | String> => {
+  try {
+    const userCredential = await createUserWithEmailAndPassword(
+      auth,
+      email,
+      password
+    );
+    return userCredential.user;
+  } catch (error: any) {
+    console.error('Error signing up: ', error.code);
+    return error.code;
+  }
+};
diff --git a/client/services/auth/tests/login.test.ts b/client/services/auth/tests/login.test.ts
new file mode 100644
index 0000000..4f92c30
--- /dev/null
+++ b/client/services/auth/tests/login.test.ts
@@ -0,0 +1,30 @@
+// import { mockAuth } from 'firebase-mock';
+// import { logIn } from 'client/services/auth/login.ts'; // Adjust path to match your project structure
+
+// describe('logIn function', () => {
+//   const auth = mockAuth();
+
+//   it('should log in with valid credentials', async () => {
+//     auth.signInWithEmailAndPassword.mockResolvedValueOnce({
+//       user: {
+//         uid: 'mock-user-id',
+//         email: 'user@example.com',
+//         // ...other user properties
+//       },
+//     });
+
+//     const user = await logIn('user@example.com', 'password');
+
+//     expect(user).toBeDefined();
+//     expect(user.uid).toBe('mock-user-id');
+//     expect(user.email).toBe('user@example.com');
+//   });
+
+//   it('should handle invalid credentials', async () => {
+//     auth.signInWithEmailAndPassword.mockRejectedValueOnce(new Error('Invalid email or password'));
+
+//     const user = await logIn('invalid@email.com', 'wrongpassword');
+
+//     expect(user).toBeNull();
+//   });
+// });