diff --git a/build/android/Taskfile.yml b/build/android/Taskfile.yml
index 980b700..b157ca3 100644
--- a/build/android/Taskfile.yml
+++ b/build/android/Taskfile.yml
@@ -4,7 +4,18 @@ includes:
   common: ../Taskfile.yml
 
 vars:
-  APP_ID: '{{.APP_ID | default "com.wails.app"}}'
+  # The *installed* package name, which every adb-driven task below uses
+  # to uninstall, launch and filter. It must agree with `applicationId`
+  # in app/build.gradle, and nothing enforces that.
+  #
+  # ANDROID.md says to set this in build/config.yml. That does not work
+  # in beta.8, checked both ways: `wails3 task` builds its var set from
+  # CLI KEY=VALUE arguments and the Taskfile tree only -- nothing reads
+  # config.yml -- and even when set it feeds only these adb commands,
+  # never Gradle. So the identity is declared twice, here and in
+  # build.gradle, and a change to one alone means the official run and
+  # deploy tasks address a package that is not installed.
+  APP_ID: '{{.APP_ID | default "app.yellowjacket"}}'
   MIN_SDK: '21'
   TARGET_SDK: '35'
   # The emulator runs the host architecture; physical devices are arm64
@@ -51,6 +62,17 @@ tasks:
       - task: compile:go:shared
         vars:
           ARCH: '{{.ARCH | default .HOST_ARCH}}'
+          # This repo's one edit to the android scaffold, and it is not
+          # cosmetic. Upstream forwards ARCH here and not PRODUCTION, so
+          # compile:go:shared recomputed BUILD_FLAGS against an unset
+          # .PRODUCTION and fell back to the debug branch. package:fat
+          # calls compile:go:shared directly for amd64 (passing it), and
+          # reaches arm64 only through this task -- so a release APK
+          # shipped a *debug* 40 MB arm64 library beside a production
+          # 31 MB x86_64 one. The phone ABI, which is the only one a
+          # release is for, was the broken one. 34 MB APK before, 27
+          # after.
+          PRODUCTION: '{{.PRODUCTION}}'
     vars:
       BUILD_FLAGS: '{{if eq .PRODUCTION "true"}}-tags production,android -trimpath -buildvcs=false -ldflags="-w -s"{{else}}-tags android,debug -buildvcs=false -gcflags=all="-l"{{end}}'
     env:
diff --git a/build/android/app/build.gradle b/build/android/app/build.gradle
index 9c69943..b8c2cd0 100644
--- a/build/android/app/build.gradle
+++ b/build/android/app/build.gradle
@@ -11,11 +11,34 @@ android {
     }
 
     defaultConfig {
-        applicationId "com.wails.app"
+        // The app's identity on the device. `namespace` above stays
+        // com.wails.app -- that is the *Java package* the scaffold's
+        // MainActivity/WailsBridge live in, and renaming it would mean
+        // renaming their source. The two being different is normal and is
+        // why every `am start` needs the fully-qualified activity name
+        // (app.yellowjacket/com.wails.app.MainActivity), not `.MainActivity`.
+        //
+        // Matches build/config.yml's productIdentifier.
+        applicationId "app.yellowjacket"
         minSdk 21
         targetSdk 35
-        versionCode 1
-        versionName "1.0"
+
+        // **Android orders releases by this integer, not by the version
+        // string, and refuses to install anything not greater than what is
+        // already there.** A hardcoded 1 means the first install is the
+        // last: every later build is rejected as a downgrade and the only
+        // way out is an uninstall, which takes the user's library with it.
+        // CI derives it from the tag (1.3.1 -> 10301), monotonic as long as
+        // minor and patch stay under 100. The defaults keep a local build
+        // working with no environment at all.
+        //
+        // `Integer.parseInt`, not `(...) as Integer`: Groovy binds the call
+        // parentheses to `versionCode` before the cast, so the latter reads
+        // as `versionCode("1") as Integer` -- it sets a String, then casts
+        // the setter's null return, and Gradle fails the entire project
+        // with "Value is null" pointing at this line.
+        versionCode Integer.parseInt(System.getenv("YJ_VERSION_CODE") ?: "1")
+        versionName System.getenv("YJ_VERSION") ?: "0.0.0"
 
         // Configure supported ABIs
         ndk {
diff --git a/build/android/app/src/main/res/values/strings.xml b/build/android/app/src/main/res/values/strings.xml
index 3ed9e47..887ff9d 100644
--- a/build/android/app/src/main/res/values/strings.xml
+++ b/build/android/app/src/main/res/values/strings.xml
@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <string name="app_name">Wails App</string>
+    <string name="app_name">YellowJacket</string>
 </resources>