diff --git a/src/jobs/android_build.yml b/src/jobs/android_build.yml
index f5d9679..4ecbef6 100644
--- a/src/jobs/android_build.yml
+++ b/src/jobs/android_build.yml
@@ -33,6 +33,10 @@ parameters:
     description: The build type to build. This is normally either "debug" or "release" but you may have custom build types configured for your app.
     type: string
     default: "debug"
+  on_after_initialize:
+    description: A custom command to run right after yarn install.
+    type: string
+    default: ""
 
 steps:
   - when:
@@ -45,6 +49,12 @@ steps:
         - attach_workspace:
             at: <<parameters.workspace_root>>
   - yarn_install
+  - when:
+      condition: <<parameters.on_after_initialize>>
+      steps:
+        - run:
+            name: "on_after_initialize"
+            command: <<parameters.on_after_initialize>>
   - android_build:
       project_path: <<parameters.project_path>>
       build_type: <<parameters.build_type>>
diff --git a/src/jobs/android_test.yml b/src/jobs/android_test.yml
index 4a4e06d..98d2dd0 100644
--- a/src/jobs/android_test.yml
+++ b/src/jobs/android_test.yml
@@ -39,12 +39,26 @@ parameters:
     type: enum
     enum: ["fatal", "error", "warn", "info", "verbose", "trace"]
     default: warn
+  on_after_initialize:
+    description: Set this to true if you want to run a custom shell command right after yarn install. Provide the command in on_after_initialize_command
+    type: boolean
+    default: false
+  on_after_initialize:
+    description: A custom command to run right after yarn install.
+    type: string
+    default: ""
 
 steps:
   - attach_workspace:
       at: <<parameters.workspace_root>>
   - setup_macos_executor
   - yarn_install
+  - when:
+      condition: <<parameters.on_after_initialize>>
+      steps:
+        - run:
+            name: "on_after_initialize"
+            command: <<parameters.on_after_initialize>>
   - when:
       condition: <<parameters.start_metro>>
       steps:
diff --git a/src/jobs/ios_build.yml b/src/jobs/ios_build.yml
index a3f1ec9..e6d92dd 100644
--- a/src/jobs/ios_build.yml
+++ b/src/jobs/ios_build.yml
@@ -44,6 +44,10 @@ parameters:
   scheme:
     description: The scheme to use.
     type: string
+  on_after_initialize:
+    description: A custom command to run right after yarn install.
+    type: string
+    default: ""
 
 steps:
   - when:
@@ -57,6 +61,12 @@ steps:
             at: <<parameters.workspace_root>>
   - setup_macos_executor
   - yarn_install
+  - when:
+      condition: <<parameters.on_after_initialize>>
+      steps:
+        - run:
+            name: "on_after_initialize_command by user"
+            command: <<parameters.on_after_initialize_command>>
   - when:
       condition: <<parameters.start_metro>>
       steps:
diff --git a/src/jobs/ios_build_and_test.yml b/src/jobs/ios_build_and_test.yml
index 97daf20..11e9b2c 100644
--- a/src/jobs/ios_build_and_test.yml
+++ b/src/jobs/ios_build_and_test.yml
@@ -54,6 +54,10 @@ parameters:
     type: enum
     enum: ["fatal", "error", "warn", "info", "verbose", "trace"]
     default: warn
+  on_after_initialize:
+    description: A custom command to run right after yarn install.
+    type: string
+    default: ""
 
 steps:
   - when:
@@ -69,6 +73,12 @@ steps:
   - ios_simulator_start:
         device: <<parameters.device>>
   - yarn_install
+  - when:
+      condition: <<parameters.on_after_initialize>>
+      steps:
+        - run:
+            name: "on_after_initialize_command by user"
+            command: <<parameters.on_after_initialize_command>>
   - when:
       condition: <<parameters.start_metro>>
       steps: