diff --git a/backend/customer/internal/biz/customer.go b/backend/customer/internal/biz/customer.go
new file mode 100644
index 0000000..26ded5e
--- /dev/null
+++ b/backend/customer/internal/biz/customer.go
@@ -0,0 +1 @@
+package biz
diff --git a/backend/customer/internal/server/cors.go b/backend/customer/internal/server/cors.go
new file mode 100644
index 0000000..abb4e43
--- /dev/null
+++ b/backend/customer/internal/server/cors.go
@@ -0,0 +1 @@
+package server
diff --git a/backend/customer/internal/server/customer.go b/backend/customer/internal/server/customer.go
new file mode 100644
index 0000000..abb4e43
--- /dev/null
+++ b/backend/customer/internal/server/customer.go
@@ -0,0 +1 @@
+package server
diff --git a/backend/valuation/internal/biz/valuation.go b/backend/valuation/internal/biz/valuation.go
new file mode 100644
index 0000000..26ded5e
--- /dev/null
+++ b/backend/valuation/internal/biz/valuation.go
@@ -0,0 +1 @@
+package biz