diff --git a/lib/shift73k.ex b/lib/shift73k.ex
index 571fdbad..05ca30d7 100644
--- a/lib/shift73k.ex
+++ b/lib/shift73k.ex
@@ -7,7 +7,7 @@ defmodule Shift73k do
   if it comes from the database, an external API or others.
   """
 
-  @app_vars Application.get_env(:shift73k, :app_global_vars, time_zone: "America/New_York")
+  @app_vars Application.compile_env(:shift73k, :app_global_vars, time_zone: "America/New_York")
   @app_time_zone @app_vars[:time_zone]
 
   @weekdays [:monday, :tuesday, :wednesday, :thursday, :friday, :saturday, :sunday]
diff --git a/lib/shift73k/mailer/user_email.ex b/lib/shift73k/mailer/user_email.ex
index 0dfc4005..d5a7bc01 100644
--- a/lib/shift73k/mailer/user_email.ex
+++ b/lib/shift73k/mailer/user_email.ex
@@ -1,7 +1,7 @@
 defmodule Shift73k.Mailer.UserEmail do
   import Bamboo.Email
 
-  @mailer_vars Application.get_env(:shift73k, :app_global_vars,
+  @mailer_vars Application.compile_env(:shift73k, :app_global_vars,
                  mailer_reply_to: "admin@example.com",
                  mailer_from: {"Shift73k", "shift73k@example.com"}
                )
diff --git a/lib/shift73k/shifts/templates/shift_template.ex b/lib/shift73k/shifts/templates/shift_template.ex
index 7b1988bc..af5bd4f1 100644
--- a/lib/shift73k/shifts/templates/shift_template.ex
+++ b/lib/shift73k/shifts/templates/shift_template.ex
@@ -1,20 +1,18 @@
 defmodule Shift73k.Shifts.Templates.ShiftTemplate do
   use Ecto.Schema
   import Ecto.Changeset
+  import Shift73k, only: [app_time_zone: 0]
 
   alias Shift73k.Shifts
   alias Shift73k.Shifts.Templates.ShiftTemplate
 
-  @app_vars Application.get_env(:shift73k, :app_global_vars, time_zone: "America/New_York")
-  @time_zone @app_vars[:time_zone]
-
   @primary_key {:id, :binary_id, autogenerate: true}
   @foreign_key_type :binary_id
   schema "shift_templates" do
     field :subject, :string
     field :description, :string
     field :location, :string
-    field :time_zone, :string, default: @time_zone
+    field :time_zone, :string, default: app_time_zone()
     field :time_start, :time, default: ~T[09:00:00]
     field :time_end, :time, default: ~T[17:00:00]
 
diff --git a/lib/shift73k_web.ex b/lib/shift73k_web.ex
index 5fe8f241..5a03df6a 100644
--- a/lib/shift73k_web.ex
+++ b/lib/shift73k_web.ex
@@ -55,12 +55,12 @@ defmodule Shift73kWeb do
 
       @impl true
       def handle_info(%{event: "logout_user", payload: %{user: %User{id: id}}}, socket) do
-        with %User{id: ^id} <- socket.assigns.current_user do
-          {:noreply,
-           socket
-           |> redirect(to: Routes.user_session_path(socket, :force_logout))}
-        else
-          _any -> {:noreply, socket}
+        case socket.assigns.current_user do
+          %User{id: ^id} ->
+            {:noreply, redirect(socket, to: Routes.user_session_path(socket, :force_logout))}
+
+          _ ->
+            {:noreply, socket}
         end
       end
     end
diff --git a/lib/shift73k_web/live/shift_assign_live/index.ex b/lib/shift73k_web/live/shift_assign_live/index.ex
index 613e1404..670c32b9 100644
--- a/lib/shift73k_web/live/shift_assign_live/index.ex
+++ b/lib/shift73k_web/live/shift_assign_live/index.ex
@@ -181,6 +181,14 @@ defmodule Shift73kWeb.ShiftAssignLive.Index do
     |> assign_known_shifts()
   end
 
+  defp new_nav_cursor("now", _cursor_date), do: Date.utc_today()
+
+  defp new_nav_cursor(nav, cursor_date) do
+    cursor_date
+    |> Date.add((nav == "prev" && -30) || 30)
+    |> cursor_date()
+  end
+
   @impl true
   def handle_event("validate-shift-template", %{"shift_template" => params}, socket) do
     params = prep_template_params(params, socket.assigns.current_user)
@@ -214,16 +222,7 @@ defmodule Shift73kWeb.ShiftAssignLive.Index do
 
   @impl true
   def handle_event("month-nav", %{"month" => nav}, socket) do
-    new_cursor =
-      cond do
-        nav == "now" ->
-          Date.utc_today()
-
-        true ->
-          socket.assigns.cursor_date
-          |> Date.add((nav == "prev" && -30) || 30)
-          |> cursor_date()
-      end
+    new_cursor = new_nav_cursor(nav, socket.assigns.cursor_date)
 
     socket
     |> assign(:cursor_date, new_cursor)
diff --git a/lib/shift73k_web/live/shift_live/index.ex b/lib/shift73k_web/live/shift_live/index.ex
index fed63da0..36372328 100644
--- a/lib/shift73k_web/live/shift_live/index.ex
+++ b/lib/shift73k_web/live/shift_live/index.ex
@@ -86,20 +86,19 @@ defmodule Shift73kWeb.ShiftLive.Index do
 
   @impl true
   def handle_event("month-nav", %{"month" => nav}, socket) do
-    new_cursor =
-      cond do
-        nav == "now" ->
-          Date.utc_today()
-
-        true ->
-          socket.assigns.cursor_date
-          |> Date.add((nav == "prev" && -30) || 30)
-          |> cursor_date()
-      end
+    new_cursor = new_nav_cursor(nav, socket.assigns.cursor_date)
 
     socket
     |> assign(:cursor_date, new_cursor)
     |> update_agenda()
     |> live_noreply()
   end
+
+  defp new_nav_cursor("now", _cursor_date), do: Date.utc_today()
+
+  defp new_nav_cursor(nav, cursor_date) do
+    cursor_date
+    |> Date.add((nav == "prev" && -30) || 30)
+    |> cursor_date()
+  end
 end
diff --git a/mix.exs b/mix.exs
index 520ec53b..601ebb2a 100644
--- a/mix.exs
+++ b/mix.exs
@@ -54,7 +54,12 @@ defmodule Shift73k.MixProject do
       {:tzdata, "~> 1.1"},
       {:nimble_csv, "~> 1.0"},
       {:icalendar, "~> 1.1"},
-      {:httpoison, "~> 1.7"}
+      {:httpoison, "~> 1.7"},
+
+      # Additional packages
+
+      {:credo, "~> 1.5", only: [:dev, :test], runtime: false},
+      {:sobelow, "~> 0.8", only: :dev}
     ]
   end
 
diff --git a/mix.lock b/mix.lock
index 7149b0ff..8b3347fa 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,7 +1,8 @@
 %{
-  "bamboo": {:hex, :bamboo, "2.0.1", "323021bec4aee9bae5d57d26e3d702809d4244e91dd6e2971bfb839ff8564674", [:mix], [{:hackney, ">= 1.15.2", [hex: :hackney, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:mime, "~> 1.4", [hex: :mime, repo: "hexpm", optional: false]}, {:plug, "~> 1.0", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "4658adcb9c8d38d2d8f9c2501897875e4cbc16a0e3730213a4217a3e35022c71"},
+  "bamboo": {:hex, :bamboo, "2.0.2", "0e2914d2bea0de3b1743384c24ffbe20fbb58094376a49f1cf5d9ed9959abd82", [:mix], [{:hackney, ">= 1.15.2", [hex: :hackney, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:mime, "~> 1.4", [hex: :mime, repo: "hexpm", optional: false]}, {:plug, "~> 1.0", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "058d57cf4fcdac19413aa72732eb43c88954fb151a1cb6a382014e0cddbf6314"},
   "bamboo_smtp": {:hex, :bamboo_smtp, "4.0.0", "0cc7df161d5d440d280a6d2eb20bf80bc45ea77161728a229e5ab339dcd087cd", [:mix], [{:bamboo, "~> 2.0.0", [hex: :bamboo, repo: "hexpm", optional: false]}, {:gen_smtp, "~> 1.1.0", [hex: :gen_smtp, repo: "hexpm", optional: false]}], "hexpm", "2412015092121b9f24f3f2e654bcd98e5c5f9afb323a94f8defa22e70ba8f23d"},
   "bcrypt_elixir": {:hex, :bcrypt_elixir, "2.3.0", "6cb662d5c1b0a8858801cf20997bd006e7016aa8c52959c9ef80e0f34fb60b7a", [:make, :mix], [{:comeonin, "~> 5.3", [hex: :comeonin, repo: "hexpm", optional: false]}, {:elixir_make, "~> 0.6", [hex: :elixir_make, repo: "hexpm", optional: false]}], "hexpm", "2c81d61d4f6ed0e5cf7bf27a9109b791ff216a1034b3d541327484f46dd43769"},
+  "bunt": {:hex, :bunt, "0.2.0", "951c6e801e8b1d2cbe58ebbd3e616a869061ddadcc4863d0a2182541acae9a38", [:mix], [], "hexpm", "7af5c7e09fe1d40f76c8e4f9dd2be7cebd83909f31fee7cd0e9eadc567da8353"},
   "certifi": {:hex, :certifi, "2.6.1", "dbab8e5e155a0763eea978c913ca280a6b544bfa115633fa20249c3d396d9493", [:rebar3], [], "hexpm", "524c97b4991b3849dd5c17a631223896272c6b0af446778ba4675a1dff53bb7e"},
   "combine": {:hex, :combine, "0.10.0", "eff8224eeb56498a2af13011d142c5e7997a80c8f5b97c499f84c841032e429f", [:mix], [], "hexpm", "1b1dbc1790073076580d0d1d64e42eae2366583e7aecd455d1215b0d16f2451b"},
   "comeonin": {:hex, :comeonin, "5.3.2", "5c2f893d05c56ae3f5e24c1b983c2d5dfb88c6d979c9287a76a7feb1e1d8d646", [:mix], [], "hexpm", "d0993402844c49539aeadb3fe46a3c9bd190f1ecf86b6f9ebd71957534c95f04"},
@@ -9,6 +10,7 @@
   "cowboy": {:hex, :cowboy, "2.8.0", "f3dc62e35797ecd9ac1b50db74611193c29815401e53bac9a5c0577bd7bc667d", [:rebar3], [{:cowlib, "~> 2.9.1", [hex: :cowlib, repo: "hexpm", optional: false]}, {:ranch, "~> 1.7.1", [hex: :ranch, repo: "hexpm", optional: false]}], "hexpm", "4643e4fba74ac96d4d152c75803de6fad0b3fa5df354c71afdd6cbeeb15fac8a"},
   "cowboy_telemetry": {:hex, :cowboy_telemetry, "0.3.1", "ebd1a1d7aff97f27c66654e78ece187abdc646992714164380d8a041eda16754", [:rebar3], [{:cowboy, "~> 2.7", [hex: :cowboy, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "3a6efd3366130eab84ca372cbd4a7d3c3a97bdfcfb4911233b035d117063f0af"},
   "cowlib": {:hex, :cowlib, "2.9.1", "61a6c7c50cf07fdd24b2f45b89500bb93b6686579b069a89f88cb211e1125c78", [:rebar3], [], "hexpm", "e4175dc240a70d996156160891e1c62238ede1729e45740bdd38064dad476170"},
+  "credo": {:hex, :credo, "1.5.5", "e8f422026f553bc3bebb81c8e8bf1932f498ca03339856c7fec63d3faac8424b", [:mix], [{:bunt, "~> 0.2.0", [hex: :bunt, repo: "hexpm", optional: false]}, {:file_system, "~> 0.2.8", [hex: :file_system, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "dd8623ab7091956a855dc9f3062486add9c52d310dfd62748779c4315d8247de"},
   "db_connection": {:hex, :db_connection, "2.3.1", "4c9f3ed1ef37471cbdd2762d6655be11e38193904d9c5c1c9389f1b891a3088e", [:mix], [{:connection, "~> 1.0", [hex: :connection, repo: "hexpm", optional: false]}], "hexpm", "abaab61780dde30301d840417890bd9f74131041afd02174cf4e10635b3a63f5"},
   "decimal": {:hex, :decimal, "2.0.0", "a78296e617b0f5dd4c6caf57c714431347912ffb1d0842e998e9792b5642d697", [:mix], [], "hexpm", "34666e9c55dea81013e77d9d87370fe6cb6291d1ef32f46a1600230b1d44f577"},
   "ecto": {:hex, :ecto, "3.5.8", "8ebf12be6016cb99313348ba7bb4612f4114b9a506d6da79a2adc7ef449340bc", [:mix], [{:decimal, "~> 1.6 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "ea0be182ea8922eb7742e3ae8e71b67ee00ae177de1bf76210299a5f16ba4c77"},
@@ -39,13 +41,14 @@
   "phoenix_live_view": {:hex, :phoenix_live_view, "0.15.4", "86908dc9603cc81c07e84725ee42349b5325cb250c9c20d3533856ff18dbb7dc", [:mix], [{:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:phoenix, "~> 1.5.7", [hex: :phoenix, repo: "hexpm", optional: false]}, {:phoenix_html, "~> 2.14", [hex: :phoenix_html, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4.2 or ~> 0.5", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "35d78f3c35fe10a995dca5f4ab50165b7a90cbe02e23de245381558f821e9462"},
   "phoenix_pubsub": {:hex, :phoenix_pubsub, "2.0.0", "a1ae76717bb168cdeb10ec9d92d1480fec99e3080f011402c0a2d68d47395ffb", [:mix], [], "hexpm", "c52d948c4f261577b9c6fa804be91884b381a7f8f18450c5045975435350f771"},
   "phx_gen_auth": {:hex, :phx_gen_auth, "0.6.0", "4ffbfa5b34ad8178c3dfcb996fed776df425903595cbc8d56a9ae5bc53136810", [:mix], [{:phoenix, "~> 1.5.2", [hex: :phoenix, repo: "hexpm", optional: false]}], "hexpm", "9a801c0f0bc251d8d91d62cecba0ebb6a90b8580fa8843029d931d15164e6ad9"},
-  "plug": {:hex, :plug, "1.11.0", "f17217525597628298998bc3baed9f8ea1fa3f1160aa9871aee6df47a6e4d38e", [:mix], [{:mime, "~> 1.0", [hex: :mime, repo: "hexpm", optional: false]}, {:plug_crypto, "~> 1.1.1 or ~> 1.2", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "2d9c633f0499f9dc5c2fd069161af4e2e7756890b81adcbb2ceaa074e8308876"},
+  "plug": {:hex, :plug, "1.11.1", "f2992bac66fdae679453c9e86134a4201f6f43a687d8ff1cd1b2862d53c80259", [:mix], [{:mime, "~> 1.0", [hex: :mime, repo: "hexpm", optional: false]}, {:plug_crypto, "~> 1.1.1 or ~> 1.2", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "23524e4fefbb587c11f0833b3910bfb414bf2e2534d61928e920f54e3a1b881f"},
   "plug_cowboy": {:hex, :plug_cowboy, "2.4.1", "779ba386c0915027f22e14a48919a9545714f849505fa15af2631a0d298abf0f", [:mix], [{:cowboy, "~> 2.7", [hex: :cowboy, repo: "hexpm", optional: false]}, {:cowboy_telemetry, "~> 0.3", [hex: :cowboy_telemetry, repo: "hexpm", optional: false]}, {:plug, "~> 1.7", [hex: :plug, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "d72113b6dff7b37a7d9b2a5b68892808e3a9a752f2bf7e503240945385b70507"},
-  "plug_crypto": {:hex, :plug_crypto, "1.2.1", "5c854427528bf61d159855cedddffc0625e2228b5f30eff76d5a4de42d896ef4", [:mix], [], "hexpm", "6961c0e17febd9d0bfa89632d391d2545d2e0eb73768f5f50305a23961d8782c"},
+  "plug_crypto": {:hex, :plug_crypto, "1.2.2", "05654514ac717ff3a1843204b424477d9e60c143406aa94daf2274fdd280794d", [:mix], [], "hexpm", "87631c7ad914a5a445f0a3809f99b079113ae4ed4b867348dd9eec288cecb6db"},
   "postgrex": {:hex, :postgrex, "0.15.8", "f5e782bbe5e8fa178d5e3cd1999c857dc48eda95f0a4d7f7bd92a50e84a0d491", [:mix], [{:connection, "~> 1.0", [hex: :connection, repo: "hexpm", optional: false]}, {:db_connection, "~> 2.1", [hex: :db_connection, repo: "hexpm", optional: false]}, {:decimal, "~> 1.5 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}], "hexpm", "698fbfacea34c4cf22c8281abeb5cf68d99628d541874f085520ab3b53d356fe"},
   "ranch": {:hex, :ranch, "1.7.1", "6b1fab51b49196860b733a49c07604465a47bdb78aa10c1c16a3d199f7f8c881", [:rebar3], [], "hexpm", "451d8527787df716d99dc36162fca05934915db0b6141bbdac2ea8d3c7afc7d7"},
   "scrivener": {:hex, :scrivener, "2.7.0", "fa94cdea21fad0649921d8066b1833d18d296217bfdf4a5389a2f45ee857b773", [:mix], [], "hexpm", "30da36a427f2519cf75993271fb7c5aad1759682a70f90d880a85c3d743d2c57"},
   "scrivener_ecto": {:hex, :scrivener_ecto, "2.7.0", "cf64b8cb8a96cd131cdbcecf64e7fd395e21aaa1cb0236c42a7c2e34b0dca580", [:mix], [{:ecto, "~> 3.3", [hex: :ecto, repo: "hexpm", optional: false]}, {:scrivener, "~> 2.4", [hex: :scrivener, repo: "hexpm", optional: false]}], "hexpm", "e809f171687806b0031129034352f5ae44849720c48dd839200adeaf0ac3e260"},
+  "sobelow": {:hex, :sobelow, "0.11.1", "23438964486f8112b41e743bbfd402da3e5b296fdc9eacab29914b79c48916dd", [:mix], [{:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "9897363a7eff96f4809304a90aad819e2ad5e5d24db547af502885146746a53c"},
   "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.6", "cf344f5692c82d2cd7554f5ec8fd961548d4fd09e7d22f5b62482e5aeaebd4b0", [:make, :mix, :rebar3], [], "hexpm", "bdb0d2471f453c88ff3908e7686f86f9be327d065cc1ec16fa4540197ea04680"},
   "swoosh": {:hex, :swoosh, "1.3.2", "608819a638d527d0fd6e8892db431edd3f93c0452499880f94a80bbbcf8377e6", [:mix], [{:cowboy, "~> 1.1 or ~> 2.4", [hex: :cowboy, repo: "hexpm", optional: true]}, {:gen_smtp, "~> 0.13 or ~> 1.0", [hex: :gen_smtp, repo: "hexpm", optional: true]}, {:hackney, "~> 1.9", [hex: :hackney, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}, {:mail, "~> 0.2", [hex: :mail, repo: "hexpm", optional: true]}, {:mime, "~> 1.1", [hex: :mime, repo: "hexpm", optional: false]}, {:plug_cowboy, ">= 1.0.0", [hex: :plug_cowboy, repo: "hexpm", optional: true]}], "hexpm", "2c77c2eef273de37283bdc09c6506d466928f897600ea258fbb4765bbffd6ab2"},
   "telemetry": {:hex, :telemetry, "0.4.2", "2808c992455e08d6177322f14d3bdb6b625fbcfd233a73505870d8738a2f4599", [:rebar3], [], "hexpm", "2d1419bd9dda6a206d7b5852179511722e2b18812310d304620c7bd92a13fcef"},