diff --git a/src/main/clj/dda/c4k_jitsi/uberjar.clj b/src/main/clj/dda/c4k_jitsi/uberjar.clj
index 3d58c93..a2a27dc 100644
--- a/src/main/clj/dda/c4k_jitsi/uberjar.clj
+++ b/src/main/clj/dda/c4k_jitsi/uberjar.clj
@@ -1,56 +1,15 @@
 (ns dda.c4k-jitsi.uberjar
   (:gen-class)
   (:require
-   [clojure.spec.alpha :as s]
-   [clojure.string :as cs]
-   [clojure.tools.reader.edn :as edn]
-   [expound.alpha :as expound]
-   [dda.c4k-jitsi.core :as core]))
-
-(def usage
-  "usage:
-  
-  c4k-jitsi {your configuraton file} {your authorization file}")
-
-(s/def ::options (s/* #{"-h"}))
-(s/def ::filename (s/and string?
-                              #(not (cs/starts-with? % "-"))))
-(s/def ::cmd-args (s/cat :options ::options
-                         :args (s/?
-                                (s/cat :config ::filename
-                                       :auth ::filename))))
-
-(defn expound-config
-  [config]
-  (expound/expound ::core/config config))
-
-(defn invalid-args-msg 
-  [spec args]
-  (s/explain spec args)
-  (println (str "Bad commandline arguments\n" usage)))
+   [dda.c4k-common.uberjar :as uberjar]
+   [dda.c4k-jitsi.core :as core]
+   [dda.c4k-jitsi.jitsi :as jitsi]))
 
 (defn -main [& cmd-args]
-  (let [parsed-args-cmd (s/conform ::cmd-args cmd-args)]
-    (if (= ::s/invalid parsed-args-cmd)
-      (invalid-args-msg ::cmd-args cmd-args)
-      (let [{:keys [options args]} parsed-args-cmd
-            {:keys [config auth]} args]
-          (cond
-            (some #(= "-h" %) options)
-            (println usage)
-            :default
-            (let [config-str (slurp config)
-                  auth-str (slurp auth)
-                  config-edn (edn/read-string config-str)
-                  auth-edn (edn/read-string auth-str)
-                  config-valid? (s/valid? core/config? config-edn)
-                  auth-valid? (s/valid? core/auth? auth-edn)]
-              (if (and config-valid? auth-valid?)
-                (println (core/generate config-edn auth-edn))
-                (do
-                  (when (not config-valid?) 
-                    (println 
-                     (expound/expound-str core/config? config-edn {:print-specs? false})))
-                  (when (not auth-valid?) 
-                    (println 
-                     (expound/expound-str core/auth? auth-edn {:print-specs? false})))))))))))
+  (uberjar/main-common
+   "c4k-jitsi" 
+   jitsi/config? 
+   jitsi/auth?
+   core/config-defaults 
+   core/generate
+   cmd-args))
diff --git a/src/main/cljc/dda/c4k_jitsi/core.cljc b/src/main/cljc/dda/c4k_jitsi/core.cljc
index a43d0c7..4b4e7d5 100644
--- a/src/main/cljc/dda/c4k_jitsi/core.cljc
+++ b/src/main/cljc/dda/c4k_jitsi/core.cljc
@@ -9,11 +9,6 @@
 
 (def config-defaults {:issuer :staging})
 
-(def config? (s/keys :req-un [::jitsi/fqdn]
-                     :opt-un [::jitsi/issuer ::jitsi/ingress-type]))
-
-(def auth? (s/keys :req-un [::jitsi/jvb-auth-password ::jitsi/jicofo-auth-password ::jitsi/jicofo-component-secret]))
-
 (defn k8s-objects [config]
   (map yaml/to-string
        [(jitsi/generate-secret-jitsi config)
@@ -27,9 +22,9 @@
         (jitsi/generate-deployment config)]))
 
 (defn-spec generate any?
-  [my-config config?
-   my-auth auth?]
-  (let [resulting-config (merge config-defaults my-config my-auth)]
-    (cs/join
-     "\n---\n"
-     (k8s-objects resulting-config))))
+  [my-config jitsi/config?
+   my-auth jitsi/auth?]
+  (cm/concat-vec
+   (map yaml/to-string
+        (filter #(not (nil? %))
+                (merge config-defaults my-config my-auth)))))
diff --git a/src/main/cljc/dda/c4k_jitsi/jitsi.cljc b/src/main/cljc/dda/c4k_jitsi/jitsi.cljc
index 5dbcabf..ce2a440 100644
--- a/src/main/cljc/dda/c4k_jitsi/jitsi.cljc
+++ b/src/main/cljc/dda/c4k_jitsi/jitsi.cljc
@@ -13,6 +13,13 @@
 (s/def ::jicofo-auth-password pred/bash-env-string?)
 (s/def ::jicofo-component-secret pred/bash-env-string?)
 
+(def config? (s/keys :req-un [::fqdn]
+                     :opt-un [::issuer ::ingress-type]))
+
+(def auth? (s/keys :req-un [::jvb-auth-password 
+                            ::jicofo-auth-password 
+                            ::jicofo-component-secret]))
+
 #?(:cljs
    (defmethod yaml/load-resource :jitsi [resource-name]
      (case resource-name