diff --git a/app/common/http_client.py b/app/common/http_client.py
new file mode 100644
index 0000000..138f3f6
--- /dev/null
+++ b/app/common/http_client.py
@@ -0,0 +1,60 @@
+import urllib.request
+import json
+import os
+
+BACKOFFICE_URL = os.getenv('BACKOFFICE_URL', 'http://django_app_backoffice:8000')
+COMUNICACIONES_URL = os.getenv('COMUNICACIONES_URL', 'http://django_app_comunicaciones:8000')
+DOCUMENTACION_URL = os.getenv('DOCUMENTACION_URL', 'http://django_app_documentacion:8000')
+
+
+def _post(url, payload):
+    data = json.dumps(payload).encode('utf-8')
+    req = urllib.request.Request(
+        url, data=data,
+        headers={'Content-Type': 'application/json'},
+        method='POST'
+    )
+    with urllib.request.urlopen(req, timeout=10) as resp:
+        return json.loads(resp.read())
+
+
+# --- Backoffice ---
+def backoffice_obtener_usuario(params):
+    return _post(f'{BACKOFFICE_URL}/api/usuarios/obtener/', params)
+
+def backoffice_crear_usuario(params):
+    return _post(f'{BACKOFFICE_URL}/api/usuarios/guardar/', params)
+
+def backoffice_obtener_cliente(params):
+    return _post(f'{BACKOFFICE_URL}/api/clientes/obtener/', params)
+
+def backoffice_crear_cliente(params):
+    return _post(f'{BACKOFFICE_URL}/api/clientes/guardar/', params)
+
+def backoffice_obtener_contrato(params):
+    return _post(f'{BACKOFFICE_URL}/api/contratos/obtener/', params)
+
+def backoffice_crear_contrato(params):
+    return _post(f'{BACKOFFICE_URL}/api/contratos/guardar/', params)
+
+
+# --- Comunicaciones ---
+def comunicaciones_enviar_email(params):
+    return _post(f'{COMUNICACIONES_URL}/api/email/enviar/', params)
+
+def comunicaciones_enviar_sms(params):
+    return _post(f'{COMUNICACIONES_URL}/api/sms/enviar/', params)
+
+def comunicaciones_registrar_webhook(params):
+    return _post(f'{COMUNICACIONES_URL}/api/webhooks/registrar/', params)
+
+
+# --- Documentacion ---
+def documentacion_generar_pdf(params):
+    return _post(f'{DOCUMENTACION_URL}/api/generation/pdf/', params)
+
+def documentacion_obtener_template(params):
+    return _post(f'{DOCUMENTACION_URL}/api/templates/obtener/', params)
+
+def documentacion_guardar_documento(params):
+    return _post(f'{DOCUMENTACION_URL}/api/storage/guardar/', params)
diff --git a/deployments/docker-compose.yml b/deployments/docker-compose.yml
index 1502397..f7b1f89 100644
--- a/deployments/docker-compose.yml
+++ b/deployments/docker-compose.yml
@@ -36,6 +36,13 @@ services:
     depends_on:
       db:
         condition: service_healthy
+    networks:
+      - default
+      - saas_network
 
 volumes:
   postgres_data:
+
+networks:
+  saas_network:
+    external: true