diff --git a/scripts/figwheel.clj b/scripts/figwheel.clj
index 599c6fa73..2ed5f7fd7 100644
--- a/scripts/figwheel.clj
+++ b/scripts/figwheel.clj
@@ -7,7 +7,7 @@
 
 (ra/start-figwheel!
   {:figwheel-options {:css-dirs ["resources/public/css"]}
-   :build-ids ["dev"]
+   :build-ids ["dev" "worker"]
    :all-builds
    [{:id "dev"
      :figwheel {:on-jsload "uxbox.ui/init"}
@@ -20,10 +20,24 @@
                                   "https://test.uxbox.io/api"}
                 :warnings {:ns-var-clash false}
                 :pretty-print true
-                :language-in  :ecmascript5
+                :language-in  :ecmascript6
                 :language-out :ecmascript5
                 :output-to "resources/public/js/main.js"
                 :output-dir "resources/public/js"
+                :verbose true}}
+
+    {:id "worker"
+     :source-paths ["src" "vendor"]
+     :compiler {:main 'uxbox.worker
+                :asset-path "js"
+                :parallel-build false
+                :optimizations :simple
+                :warnings {:ns-var-clash false}
+                :pretty-print true
+                :static-fns true
+                :language-in  :ecmascript6
+                :language-out :ecmascript5
+                :output-to "resources/public/js/worker.js"
                 :verbose true}}]})
 
-(ra/cljs-repl)
+(ra/cljs-repl "dev")
diff --git a/src/uxbox/worker.cljs b/src/uxbox/worker.cljs
new file mode 100644
index 000000000..4db0d390f
--- /dev/null
+++ b/src/uxbox/worker.cljs
@@ -0,0 +1,21 @@
+;; This Source Code Form is subject to the terms of the Mozilla Public
+;; License, v. 2.0. If a copy of the MPL was not distributed with this
+;; file, You can obtain one at http://mozilla.org/MPL/2.0/.
+;;
+;; Copyright (c) 2016 Andrey Antukh <niwi@niwi.nz>
+
+(ns uxbox.worker
+  (:require [beicon.core :as rx]
+            [uxbox.util.transit :as t]
+            [uxbox.worker.core :as wrk]
+            [uxbox.worker.align]))
+
+(enable-console-print!)
+
+(defn- on-message
+  [event]
+  (let [message (t/decode (.-data event))]
+    (wrk/handler message)))
+
+(defonce _
+  (.addEventListener js/self "message" on-message))
diff --git a/src/uxbox/worker/core.cljs b/src/uxbox/worker/core.cljs
new file mode 100644
index 000000000..43988fb93
--- /dev/null
+++ b/src/uxbox/worker/core.cljs
@@ -0,0 +1,31 @@
+;; This Source Code Form is subject to the terms of the Mozilla Public
+;; License, v. 2.0. If a copy of the MPL was not distributed with this
+;; file, You can obtain one at http://mozilla.org/MPL/2.0/.
+;;
+;; Copyright (c) 2016 Andrey Antukh <niwi@niwi.nz>
+
+(ns uxbox.worker.core
+  (:require [uxbox.util.transit :as t]))
+
+(enable-console-print!)
+
+;; --- Handler
+
+(defmulti handler :cmd)
+
+(defmethod handler :default
+  [message]
+  (println "Unexpected message:" message))
+
+;; --- Helpers
+
+(defn worker?
+  "Check if the code is executed in webworker context."
+  []
+  (undefined? (.-document js/self)))
+
+(defn reply!
+  [sender message]
+  (let [message (assoc message :reply-to sender)]
+    (println "replying " message)
+    (.postMessage js/self (t/encode message))))