diff --git a/package.json b/package.json
index 5dd9d997..c5d7aeef 100644
--- a/package.json
+++ b/package.json
@@ -20,6 +20,7 @@
     "react-test-renderer": "^15.4.2",
     "redux": "^3.6.0",
     "redux-form": "^6.5.0",
+    "redux-saga": "^0.14.3",
     "sanitize.css": "^4.1.0",
     "sharetribe-scripts": "0.8.6",
     "source-map-support": "^0.4.11"
diff --git a/src/ducks/Auth.ducks.js b/src/ducks/Auth.ducks.js
new file mode 100644
index 00000000..8a5be972
--- /dev/null
+++ b/src/ducks/Auth.ducks.js
@@ -0,0 +1,78 @@
+/**
+ * Authentication duck.
+ */
+import { delay } from 'redux-saga';
+import { call, put, takeEvery } from 'redux-saga/effects';
+
+// ================ Action types ================ //
+
+export const LOGIN = 'app/Auth/LOGIN';
+export const LOGIN_SUCCESS = 'app/Auth/LOGIN_SUCCESS';
+export const LOGIN_FAILURE = 'app/Auth/LOGIN_FAILURE';
+export const LOGOUT = 'app/Auth/LOGOUT';
+export const LOGOUT_SUCCESS = 'app/Auth/LOGOUT_SUCCESS';
+export const LOGOUT_FAILURE = 'app/Auth/LOGOUT_FAILURE';
+
+// ================ Reducer ================ //
+
+const initialState = {
+  loginInProgress: false,
+  logoutInProgress: false,
+  loginError: null,
+  logoutError: null,
+  isAuthenticated: false,
+  user: null,
+};
+
+export default function reducer(state = initialState, action = {}) {
+  const { type, payload } = action;
+  switch (type) {
+    case LOGIN:
+      return { ...state, loginInProgress: true };
+    case LOGIN_SUCCESS:
+      return { ...state, loginInProgress: false, isAuthenticated: true, user: payload };
+    case LOGIN_FAILURE:
+      return { ...state, loginInProgress: false, loginError: payload };
+    case LOGOUT:
+      return { ...state, logoutInProgress: true };
+    case LOGOUT_SUCCESS:
+      return { ...state, logoutInProgress: false, isAuthenticated: false, user: null };
+    case LOGOUT_FAILURE:
+      return { ...state, logoutInProgress: false, logoutError: payload };
+    default:
+      return state;
+  }
+}
+
+// ================ Action creators ================ //
+
+export const login = (email, password) => ({ type: LOGIN, payload: { email, password } });
+export const loginSuccess = user => ({ type: LOGIN_SUCCESS, payload: user });
+export const loginFailure = error => ({ type: LOGIN_FAILURE, payload: error, error: true });
+
+export const logout = () => ({ type: LOGOUT });
+export const logoutSuccess = () => ({ type: LOGOUT_SUCCESS });
+export const logoutFailure = error => ({ type: LOGOUT_FAILURE, payload: error, error: true });
+
+// ================ Worker sagas ================ //
+
+function* callLogin(action) {
+  const { payload } = action;
+  yield call(delay, 1000);
+  yield put(loginSuccess(payload));
+}
+
+function* callLogout() {
+  yield call(delay, 1000);
+  yield put(logoutSuccess());
+}
+
+// ================ Watcher sagas ================ //
+
+export function* watchLogin() {
+  yield takeEvery(LOGIN, callLogin);
+}
+
+export function* watchLogout() {
+  yield takeEvery(LOGOUT, callLogout);
+}
diff --git a/src/ducks/index.js b/src/ducks/index.js
index 7a760a4d..2ee369e4 100644
--- a/src/ducks/index.js
+++ b/src/ducks/index.js
@@ -5,7 +5,8 @@
  */
 
 import { reducer as formReducer } from 'redux-form';
+import Auth from './Auth.ducks';
 import FlashNotification from './FlashNotification.ducks';
 import LocationFilter from './LocationFilter.ducks';
 
-export { formReducer as form, FlashNotification, LocationFilter };
+export { formReducer as form, Auth, FlashNotification, LocationFilter };
diff --git a/src/sagas.js b/src/sagas.js
new file mode 100644
index 00000000..ae72fac3
--- /dev/null
+++ b/src/sagas.js
@@ -0,0 +1,5 @@
+import { watchLogin, watchLogout } from './ducks/Auth.ducks';
+
+export default function* rootSaga() {
+  yield [watchLogin(), watchLogout()];
+}
diff --git a/src/store.js b/src/store.js
index 04929ca7..ad4f25f8 100644
--- a/src/store.js
+++ b/src/store.js
@@ -1,18 +1,29 @@
 /* eslint-disable no-underscore-dangle */
-import { createStore } from 'redux';
+import { createStore, applyMiddleware, compose } from 'redux';
+import createSagaMiddleware from 'redux-saga';
 import createReducer from './reducers';
+import rootSaga from './sagas';
 
 /**
- * configureStore creates a new store with initial state and possible enhancers
- * (like redux-saga or redux-thunk middleware)
+ * Create a new store with the given initial state. Adds Redux
+ * middleware and enhancers.
  */
-export default function configureStore(initialState) {
-  const useReduxDevTools = process.env.NODE_ENV !== 'production' &&
-    typeof window !== 'undefined' &&
-    window.__REDUX_DEVTOOLS_EXTENSION__;
+export default function configureStore(initialState = {}) {
+  const sagaMiddleware = createSagaMiddleware();
 
-  if (useReduxDevTools) {
-    return createStore(createReducer(), initialState, window.__REDUX_DEVTOOLS_EXTENSION__());
-  }
-  return createStore(createReducer(), initialState);
+  const middlewares = [sagaMiddleware];
+
+  // Enable Redux Devtools in client side dev mode.
+  const composeEnhancers = process.env.NODE_ENV !== 'production' &&
+    typeof window === 'object' &&
+    window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__
+    ? window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__
+    : compose;
+
+  const enhancer = composeEnhancers(applyMiddleware(...middlewares));
+  const store = createStore(createReducer(), initialState, enhancer);
+
+  sagaMiddleware.run(rootSaga);
+
+  return store;
 }
diff --git a/yarn.lock b/yarn.lock
index bdfbb57e..f4f3b313 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5129,6 +5129,10 @@ redux-form@^6.5.0:
     lodash "^4.17.3"
     lodash-es "^4.17.3"
 
+redux-saga@^0.14.3:
+  version "0.14.3"
+  resolved "https://registry.yarnpkg.com/redux-saga/-/redux-saga-0.14.3.tgz#28cd2c5b49cf780a1de25875765724150c630513"
+
 redux@^3.6.0:
   version "3.6.0"
   resolved "https://registry.yarnpkg.com/redux/-/redux-3.6.0.tgz#887c2b3d0b9bd86eca2be70571c27654c19e188d"