diff --git a/backoffice/BACKOFFICE.md b/backoffice/BACKOFFICE.md
index 9f09c9f..e9f7cc8 100644
--- a/backoffice/BACKOFFICE.md
+++ b/backoffice/BACKOFFICE.md
@@ -10,6 +10,33 @@ GoHorse Jobs SaaS Administration, Subscription Management, and Email Worker API.
 
 ## 🏗️ Arquitetura
 
+```mermaid
+C4Container
+    title Container Diagram - Backoffice Architecture
+
+    Person(admin, "Admin System", "Platform Administrator")
+    System_Ext(go_api, "Go Backend API", "Core Business Logic")
+    
+    Container_Boundary(backoffice_boundary, "Backoffice") {
+        Container(backoffice, "Backoffice API", "NestJS", "Admin Dashboard, Worker & Integration Layer")
+    }
+
+    System_Ext(db, "PostgreSQL", "Shared Database (Templates, Settings)")
+    System_Ext(mq, "LavinMQ", "Email/Job Queue")
+    System_Ext(stripe, "Stripe", "Payment Gateway")
+    System_Ext(fcm, "Firebase FCM", "Push Notifications")
+    System_Ext(smtp, "SMTP Service", "Email Delivery")
+
+    Rel(admin, backoffice, "Views Stats/Revenue", "HTTPS")
+    Rel(go_api, mq, "Publishes Email Jobs", "AMQP")
+    
+    Rel(backoffice, mq, "Consumes Jobs", "AMQP")
+    Rel(backoffice, db, "Read/Write", "SQL")
+    Rel(backoffice, stripe, "Syncs Payments", "HTTPS")
+    Rel(backoffice, fcm, "Sends Notifications", "HTTPS")
+    Rel(backoffice, smtp, "Sends Emails", "SMTP")
+```
+
 ```
 backoffice/
 ├── src/