diff --git a/config/config.exs b/config/config.exs
index d5db9ef8..0b4f676f 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -21,7 +21,8 @@ config :safira,
   spotlight_duration: String.to_integer(System.get_env("SPOTLIGHT_DURATION") || "30"),
   discord_bot_url: System.get_env("DISCORD_BOT_URL"),
   discord_bot_api_key: System.get_env("DISCORD_BOT_API_KEY"),
-  discord_invite_url: System.get_env("DISCORD_INVITE_URL")
+  discord_invite_url: System.get_env("DISCORD_INVITE_URL"),
+  max_cv_file_size: String.to_integer(System.get_env("MAX_CV_SIZE") || "8000000")
 
 # Configures the endpoint
 config :safira, SafiraWeb.Endpoint,
diff --git a/lib/safira/email.ex b/lib/safira/email.ex
index 3c94d8fe..fd4e2755 100644
--- a/lib/safira/email.ex
+++ b/lib/safira/email.ex
@@ -4,11 +4,11 @@ defmodule Safira.Email do
   """
   # use Bamboo.Phoenix, view: Safira.FeedbackView
   import Bamboo.Email
-
+  @from_email Application.compile_env!(:safira, :from_email)
   def send_reset_email(to_email, token) do
     new_email()
     |> to(to_email)
-    |> from(System.get_env("FROM_EMAIL"))
+    |> from(@from_email)
     |> subject("[SEI '23] Reset password instructions")
     |> html_body(build_reset_password_email_text(token))
     |> Safira.Mailer.deliver_now()
diff --git a/lib/safira/interaction/interaction.ex b/lib/safira/interaction/interaction.ex
index f94d205c..40a9f113 100644
--- a/lib/safira/interaction/interaction.ex
+++ b/lib/safira/interaction/interaction.ex
@@ -17,6 +17,8 @@ defmodule Safira.Interaction do
 
   alias Safira.Repo
 
+  @token_bonus Application.compile_env!(:safira, :token_bonus)
+
   @doc """
   Returns the list of bonuses.
 
@@ -134,7 +136,7 @@ defmodule Safira.Interaction do
     |> Multi.update(
       :update_attendee,
       Attendee.update_token_balance_changeset(attendee, %{
-        token_balance: attendee.token_balance + Application.fetch_env!(:safira, :token_bonus)
+        token_balance: attendee.token_balance + @token_bonus
       })
     )
     |> Multi.insert_or_update(:daily_token, fn %{update_attendee: attendee} ->
diff --git a/lib/safira/roulette/roulette.ex b/lib/safira/roulette/roulette.ex
index c8121761..fa96162c 100644
--- a/lib/safira/roulette/roulette.ex
+++ b/lib/safira/roulette/roulette.ex
@@ -18,6 +18,10 @@ defmodule Safira.Roulette do
   alias Safira.Roulette.Prize
   alias Safira.Store
 
+  @roulette_cost Application.compile_env!(:safira, :roulette_cost)
+  @roulette_tokens_min Application.compile_env!(:safira, :roulette_tokens_min)
+  @roulette_tokens_max Application.compile_env!(:safira, :roulette_tokens_max)
+
   @doc """
   Returns the list of prizes.
 
@@ -247,7 +251,7 @@ defmodule Safira.Roulette do
     |> Multi.update(
       :attendee,
       Attendee.update_token_balance_changeset(attendee, %{
-        token_balance: attendee.token_balance - Application.fetch_env!(:safira, :roulette_cost)
+        token_balance: attendee.token_balance - @roulette_cost
       })
     )
     # prize after spinning
@@ -330,8 +334,8 @@ defmodule Safira.Roulette do
   end
 
   defp calculate_tokens(attendee) do
-    min = Application.fetch_env!(:safira, :roulette_tokens_min)
-    max = Application.fetch_env!(:safira, :roulette_tokens_max)
+    min = @roulette_tokens_min
+    max = @roulette_tokens_max
     tokens = Enum.random(min..max)
 
     Multi.new()
diff --git a/lib/safira/web/uploaders/cv.ex b/lib/safira/web/uploaders/cv.ex
index ed091185..febf2951 100644
--- a/lib/safira/web/uploaders/cv.ex
+++ b/lib/safira/web/uploaders/cv.ex
@@ -16,7 +16,7 @@ defmodule Safira.CV do
 
   @versions [:original]
   @acl :public_read
-  @max_file_size String.to_integer(System.get_env("MAX_CV_FILE_SIZE") || "8000000")
+  @max_file_size Application.compile_env!(:safira, :max_cv_file_size)
 
   def validate({file, _}) do
     size = file_size(file)
diff --git a/lib/safira_web/views/bonus_view.ex b/lib/safira_web/views/bonus_view.ex
index 6af2ad0c..d1213ab1 100644
--- a/lib/safira_web/views/bonus_view.ex
+++ b/lib/safira_web/views/bonus_view.ex
@@ -1,6 +1,8 @@
 defmodule SafiraWeb.BonusView do
   use SafiraWeb, :view
 
+  @token_bonus Application.compile_env!(:safira, :token_bonus)
+
   def render("bonus.json", changes) do
     attendee = Map.get(changes, :update_attendee)
     bonus = Map.get(changes, :upsert_bonus)
@@ -8,7 +10,7 @@ defmodule SafiraWeb.BonusView do
     %{
       name: attendee.name,
       attendee_id: attendee.id,
-      token_bonus: Application.fetch_env!(:safira, :token_bonus),
+      token_bonus: @token_bonus,
       bonus_count: bonus.count,
       company_id: bonus.company_id
     }