diff --git a/gso/services/netbox_client.py b/gso/services/netbox_client.py
index 9a9d65e042ed7b2823a2a7bc17f1ee3f8ca36483..2fb397af09843b5f308eaa8991b46f1220abcf5a 100644
--- a/gso/services/netbox_client.py
+++ b/gso/services/netbox_client.py
@@ -145,7 +145,7 @@ class NetboxClient:
         """Create a new device in Netbox."""
 
         # Get device type id
-        tier_info = TierInfo().get_module_by_name(f"Tier{site_tier}")
+        tier_info = TierInfo().get_module_by_name(f"tier{site_tier}")
         device_type = self.netbox.dcim.device_types.get(model=tier_info.device_type)
 
         # Get device role id
@@ -261,7 +261,6 @@ class NetboxClient:
         ):
             interface.lag = None
             interface.save()
-        return
 
     def get_available_lags(self, router_id: UUID) -> list[str]:
         """Return all available :term:`LAG`s not assigned to a device."""
diff --git a/gso/utils/device_info.py b/gso/utils/device_info.py
index 5a139889229efd80918e45079c805f18461e9dbb..15eaa6220d0cd4ba1247cb0911d27227274c3f8b 100644
--- a/gso/utils/device_info.py
+++ b/gso/utils/device_info.py
@@ -11,14 +11,14 @@ class ModuleInfo(BaseModel):
 
 class TierInfo:
     def __init__(self) -> None:
-        self.Tier1 = ModuleInfo(
+        self.tier1 = ModuleInfo(
             device_type="7750 SR-7s",
             module_bays_slots=[1, 2],
             module_type="XMA2-s-36p-400g",
             breakout_interfaces_per_slot=[36, 35, 34, 33],
             total_10g_interfaces=80,
         )
-        self.Tier2 = ModuleInfo(
+        self.tier2 = ModuleInfo(
             device_type="7750-SR7s",
             module_bays_slots=[1, 2],
             module_type="XMA2-s-36p-400g",
diff --git a/gso/workflows/iptrunk/migrate_iptrunk.py b/gso/workflows/iptrunk/migrate_iptrunk.py
index 0d238437f4ec9f8016c0e693be1ea8fd201c13ff..596a4399c95b0ded27b43cb961907d34bbbc60e6 100644
--- a/gso/workflows/iptrunk/migrate_iptrunk.py
+++ b/gso/workflows/iptrunk/migrate_iptrunk.py
@@ -35,6 +35,8 @@ from gso.utils.helpers import (
 
 logger = getLogger(__name__)
 
+PLAYBOOK_VERB_NOT_YET_PROPERLY_SET = "Playbook verb is not yet properly set."
+
 
 def initial_input_form_generator(subscription_id: UUIDstr) -> FormGenerator:
     subscription = Iptrunk.from_subscription(subscription_id)
@@ -232,7 +234,7 @@ def deploy_new_config_dry(
         "trunk_interface",
     )
 
-    logger.warning("Playbook verb is not yet properly set.")
+    logger.warning(PLAYBOOK_VERB_NOT_YET_PROPERLY_SET)
 
     return {
         "subscription": subscription,
@@ -264,7 +266,7 @@ def deploy_new_config_real(
         False,
     )
 
-    logger.warning("Playbook verb is not yet properly set.")
+    logger.warning(PLAYBOOK_VERB_NOT_YET_PROPERLY_SET)
 
     return {
         "subscription": subscription,
@@ -315,7 +317,7 @@ def deploy_new_isis(
         False,
     )
 
-    logger.warning("Playbook verb is not yet properly set.")
+    logger.warning(PLAYBOOK_VERB_NOT_YET_PROPERLY_SET)
 
     return {
         "subscription": subscription,
@@ -371,7 +373,7 @@ def delete_old_config_dry(
         "delete",
     )
 
-    logger.warning("Playbook verb is not yet properly set.")
+    logger.warning(PLAYBOOK_VERB_NOT_YET_PROPERLY_SET)
 
     return {"subscription": subscription}
 
@@ -401,7 +403,7 @@ def delete_old_config_real(
         False,
     )
 
-    logger.warning("Playbook verb is not yet properly set.")
+    logger.warning(PLAYBOOK_VERB_NOT_YET_PROPERLY_SET)
 
     return {"subscription": subscription}