diff --git a/build.gradle b/build.gradle
index 2375b4c..1425b58 100644
--- a/build.gradle
+++ b/build.gradle
@@ -24,10 +24,6 @@ task resolveDependencies {
 }
 
 void resolveConfiguration(subProject, configuration, name) {
-  // TODO: fix this
-  if (subProject.name == "app") {
-    return;
-  }
   if (configuration.canBeResolved) {
     logger.info("Resolving project {} {}", subProject.name, name)
     configuration.resolve()
diff --git a/flake.nix b/flake.nix
index aa4db7e..60f9b02 100644
--- a/flake.nix
+++ b/flake.nix
@@ -44,7 +44,7 @@
           buildPhase = ''
             export GRADLE_USER_HOME=$(mktemp -d)
             # Fetch the maven deps
-            gradle --no-daemon --info -Dorg.gradle.java.home=${pkgs.openjdk_headless} resolveDependencies
+            gradle --no-daemon --info -Dorg.gradle.java.home=${pkgs.openjdk_headless} --write-verification-metadata sha256
           '';
           installPhase = ''
             find $GRADLE_USER_HOME/caches/modules-2 -type f -regex '.*\.\(jar\|pom\)$' \
@@ -53,7 +53,7 @@
           '';
           outputHashAlgo = "sha256";
           outputHashMode = "recursive";
-          outputHash = "sha256-OXNB19WPC5MyLEoDAtnVM9XykY7e0mKGRH5Aw8C/lMo=";
+          outputHash = "sha256-kW9pzfqOZwwvymS9If5wubkYHXM81YwHSSgzJjgnf0c=";
         };
         invtracker-server = pkgs.stdenv.mkDerivation {
           pname = "invtracker-server";
@@ -71,6 +71,26 @@
             cp -rv server/build/install/server $out/
           '';
         };
+        invtracker-client = pkgs.stdenv.mkDerivation rec {
+          pname = "invtracker-client";
+          version = self.lastModifiedDate;
+          src = self;
+          nativeBuildInputs = with pkgs; [gradle openjdk_headless androidenv.androidPkgs_9_0.androidsdk ];
+          buildPhase = ''
+            sed -i 's#gradlePluginPortal..#maven { url "${invtracker-deps}/maven" }#' settings.gradle
+            sed -i 's#google..#maven { url "${invtracker-deps}/maven" }#' settings.gradle
+
+            export GRADLE_USER_HOME=$(mktemp -d)
+            gradle --offline --no-daemon --info -Dorg.gradle.java.home=${pkgs.openjdk_headless} app:build
+          '';
+          installPhase = ''
+            mkdir $out
+            cp app/build/outputs/apk/release/app-release-unsigned.apk $out/app.apk
+            mkdir $out/nix-support
+            echo "file binary-dist $out/app.apk" > $out/nix-support/hydra-build-products
+            echo "$pname-$version" > $out/nix-support/hydra-release-name
+          '';
+        };
       };
 
       hydraJobs =