diff --git a/frontend/src/App.jsx b/frontend/src/App.jsx
index 52afc9c..d2c25e7 100644
--- a/frontend/src/App.jsx
+++ b/frontend/src/App.jsx
@@ -1,6 +1,5 @@
 import { Routes, Route, Navigate } from "react-router-dom";
 import { useAuth } from "./contexts/AuthContext";
-import { useContext } from 'react'
 import Navbar from "./components/Navbar";
 import Login from "./pages/login/Login";
 import Signup from "./pages/Signup";
@@ -9,11 +8,11 @@ import Addresses from "./pages/addresses/Addresses";
 import Alerts from "./pages/alerts/Alerts";
 import AlertHistory from "./pages/alertHistory/AlertHistory";
 import Account from "./pages/user_account/Account";
-import { AuthProvider } from "./ShopContext";
-import useAuth from "./ShopContext";
 
 export default function App() {
-  const { context } = useContext(ShopContext)
+  const { currentUser, isSubscribed, loading } = useAuth();
+
+  if (loading) return null;
 
   if (!currentUser) {
     return (
diff --git a/frontend/src/contexts/AuthContext.jsx b/frontend/src/contexts/AuthContext.jsx
index 47cc435..cb375e6 100644
--- a/frontend/src/contexts/AuthContext.jsx
+++ b/frontend/src/contexts/AuthContext.jsx
@@ -1,54 +1,94 @@
-import { createContext, useReducer, useContext } from "react";
-import shopReducer, { initialState } from "./shopReducer";
+import { createContext, useContext, useState, useEffect, useCallback } from "react";
+import {
+  onAuthStateChanged,
+  signInWithEmailAndPassword,
+  createUserWithEmailAndPassword,
+  signOut,
+} from "firebase/auth";
+import { auth } from "../firebase/config";
+import { getAccount } from "../api/account";
 
-const AuthContext = createContext(initialState);
+const AuthContext = createContext(undefined);
 
-export const AuthProvider = ({ children }) => {
-  const [state, dispatch] = useReducer(shopReducer, initialState);
-
-  const addAuthUser = (args) => {
-    const updatedUser = state.user.concat(product);
-    updatePrice(updatedCart);
-    dispatch({
-      type: "ADD_AUTH_USER",
-      payload: {
-        args: newUser
-      }
-    });
-  };
-
-  const logoutAuthUser = (args) => {
-    const updatedUser = state.user.filter(
-      (currentUser) => currentUser.name !== args.name
-    );
-    updateUser(updatedCart);
-
-    dispatch({
-      type: "REMOVE_AUTH_USER",
-      payload: {
-        args: updatedCart
-      }
-    });
-  };
-
-
-  const value = {
-    authUser: state.name,
-    authUserTier: state.tier,
-    addAuthUser,
-    logoutAuthUser
-  };
-  return <AuthContext.Provider value={value}>{children}</AuthContext.Provider>;
+const DEFAULT_TIER_LIMITS = {
+  max_addresses: 1,
+  max_alert_types: 1,
+  allowed_channels: ["email"],
 };
 
-const useAuth = () => {
-  const context = useContext(ShopContext);
+export function AuthProvider({ children }) {
+  const [currentUser, setCurrentUser] = useState(null);
+  const [userTier, setUserTier] = useState("free");
+  const [tierLimits, setTierLimits] = useState(DEFAULT_TIER_LIMITS);
+  const [isSubscribed, setIsSubscribed] = useState(false);
+  const [loading, setLoading] = useState(true);
 
-  if (context === undefined) {
-    throw new Error("authUser must be used within AuthContext");
+  const fetchAccount = useCallback(async () => {
+    try {
+      const data = await getAccount();
+      setUserTier(data.subscription_tier || "free");
+      setTierLimits(data.tier_limits || DEFAULT_TIER_LIMITS);
+      setIsSubscribed(
+        data.subscription_status === "active" ||
+          data.subscription_status === "trialing",
+      );
+    } catch {
+      setUserTier("free");
+      setTierLimits(DEFAULT_TIER_LIMITS);
+      setIsSubscribed(false);
+    }
+  }, []);
+
+  useEffect(() => {
+    const unsubscribe = onAuthStateChanged(auth, async (user) => {
+      setCurrentUser(user);
+      if (user) {
+        await fetchAccount();
+      } else {
+        setUserTier("free");
+        setTierLimits(DEFAULT_TIER_LIMITS);
+        setIsSubscribed(false);
+      }
+      setLoading(false);
+    });
+    return unsubscribe;
+  }, [fetchAccount]);
+
+  async function signup(email, password) {
+    const cred = await createUserWithEmailAndPassword(auth, email, password);
+    return cred.user;
   }
 
+  async function login(email, password) {
+    const cred = await signInWithEmailAndPassword(auth, email, password);
+    return cred.user;
+  }
+
+  async function logout() {
+    await signOut(auth);
+  }
+
+  const value = {
+    currentUser,
+    userTier,
+    tierLimits,
+    isSubscribed,
+    loading,
+    signup,
+    login,
+    logout,
+    refreshAccount: fetchAccount,
+  };
+
+  return <AuthContext.Provider value={value}>{children}</AuthContext.Provider>;
+}
+
+export function useAuth() {
+  const context = useContext(AuthContext);
+  if (context === undefined) {
+    throw new Error("useAuth must be used within an AuthProvider");
+  }
   return context;
-};
+}
 
 export default useAuth;
diff --git a/frontend/src/contexts/UserPropertiesContext.jsx b/frontend/src/contexts/UserPropertiesContext.jsx
new file mode 100644
index 0000000..0bb91a4
--- /dev/null
+++ b/frontend/src/contexts/UserPropertiesContext.jsx
@@ -0,0 +1,44 @@
+import { createContext, useReducer, useContext } from "react";
+
+const initialState = {
+  email: "",
+  password: "",
+};
+
+const ACTION_TYPES = {
+  SET_USER_PROPERTIES: "SET_USER_PROPERTIES",
+  CLEAR_USER_PROPERTIES: "CLEAR_USER_PROPERTIES",
+};
+
+function userPropertiesReducer(state, action) {
+  switch (action.type) {
+    case ACTION_TYPES.SET_USER_PROPERTIES:
+      return { ...state, ...action.payload };
+    case ACTION_TYPES.CLEAR_USER_PROPERTIES:
+      return { ...initialState };
+    default:
+      return state;
+  }
+}
+
+const UserPropertiesContext = createContext(undefined);
+
+export function UserPropertiesProvider({ children }) {
+  const [state, dispatch] = useReducer(userPropertiesReducer, initialState);
+
+  return (
+    <UserPropertiesContext.Provider value={{ state, dispatch, ACTION_TYPES }}>
+      {children}
+    </UserPropertiesContext.Provider>
+  );
+}
+
+export function useUserProperties() {
+  const context = useContext(UserPropertiesContext);
+  if (context === undefined) {
+    throw new Error(
+      "useUserProperties must be used within a UserPropertiesProvider",
+    );
+  }
+  return context;
+}
diff --git a/frontend/src/pages/subscribe/Subscribe.jsx b/frontend/src/pages/subscribe/Subscribe.jsx
index 98e44e7..7a9560a 100644
--- a/frontend/src/pages/subscribe/Subscribe.jsx
+++ b/frontend/src/pages/subscribe/Subscribe.jsx
@@ -141,6 +141,8 @@ export default function Subscribe() {
         return;
       }
 
+      sessionStorage.setItem("kp_onboard_email", data.email);
+      sessionStorage.setItem("kp_onboard_pw", data.password);
       dispatch({
         type: ACTION_TYPES.SET_USER_PROPERTIES,
         payload: { email: data.email, password: data.password },
diff --git a/frontend/src/reducers/authReducer.jsx b/frontend/src/reducers/authReducer.jsx
deleted file mode 100644
index dd1c505..0000000
--- a/frontend/src/reducers/authReducer.jsx
+++ /dev/null
@@ -1,32 +0,0 @@
-import { useReducer } from "react"
-
-const UserAuthContext = createContext();
-
-export const initialState = {
-  authUser: null,
-  AuthTier: null
-};
-
-const authReducer = (state, action) => {
-  const { type, payload = "FREE_TIER" } = action
-
-  switch (type) {
-    case "ADD_AUTH_USER":
-      console.log("ADD_AUTH_USER", payload);
-      return {
-        ...state,
-        auth: payload
-      };
-    default:
-      throw new Error(`No case for type ${type} found.`);
-  }
-  switch (type) {
-    case "DELETE_AUTH_USER":
-      return {
-        ...state,
-        users: state.users.filter(user => user.id !== action.userIdToDelete)
-      };
-  }
-}
-
-export default shopReducer
\ No newline at end of file