diff --git a/.tool-versions b/.tool-versions
index 18625f1..18a6828 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,2 +1,2 @@
 erlang 26.0.2
-elixir 1.17.0
+elixir 1.17.1
diff --git a/lib/igniter.ex b/lib/igniter.ex
index fea01f7..88c3d06 100644
--- a/lib/igniter.ex
+++ b/lib/igniter.ex
@@ -116,7 +116,7 @@ defmodule Igniter do
     glob =
       case glob do
         %GlobEx{} = glob -> glob
-        string -> GlobEx.compile!(string)
+        string -> GlobEx.compile!(Path.expand(string))
       end
 
     igniter = include_glob(igniter, glob)
@@ -885,6 +885,7 @@ defmodule Igniter do
     end)
   end
 
+  # sobelow_skip ["RCE.CodeModule"]
   defp parse_igniter_config(igniter) do
     case Rewrite.source(igniter.rewrite, ".igniter.exs") do
       {:error, _} ->
diff --git a/lib/igniter/code/common.ex b/lib/igniter/code/common.ex
index 8e215b8..4d4f122 100644
--- a/lib/igniter/code/common.ex
+++ b/lib/igniter/code/common.ex
@@ -7,7 +7,7 @@ defmodule Igniter.Code.Common do
   @doc """
   Moves to the next node that matches the predicate.
   """
-  @spec move_to(Zipper.t(), (Zipper.tree() -> Zipper.t())) :: {:ok, Zipper.t()} | :error
+  @spec move_to(Zipper.t(), (Zipper.tree() -> boolean())) :: {:ok, Zipper.t()} | :error
   def move_to(zipper, pred) do
     Zipper.find(zipper, fn thing ->
       try do
@@ -26,6 +26,22 @@ defmodule Igniter.Code.Common do
     end
   end
 
+  @doc """
+  Moves to the next zipper that matches the predicate.
+  """
+  @spec move_to(Zipper.t(), (Zipper.t() -> boolean())) :: {:ok, Zipper.t()} | :error
+  def move_to_zipper(zipper, pred) do
+    if pred.(zipper) do
+      {:ok, zipper}
+    else
+      if next = Zipper.next(zipper) do
+        move_to_zipper(next, pred)
+      else
+        :error
+      end
+    end
+  end
+
   @doc """
   Returns `true` if the current node matches the given pattern.
 
@@ -612,11 +628,20 @@ defmodule Igniter.Code.Common do
 
   @spec nodes_equal?(Zipper.t() | Macro.t(), Macro.t()) :: boolean
   def nodes_equal?(%Zipper{} = left, right) do
-    left
-    |> expand_aliases()
-    |> Zipper.subtree()
-    |> Zipper.node()
-    |> nodes_equal?(right)
+    with zipper when not is_nil(zipper) <- Zipper.up(left),
+         {:defmodule, _, [{:__aliases__, _, parts}, _]} <-
+           zipper |> Zipper.subtree() |> Zipper.node(),
+         {:ok, env} <- current_env(zipper),
+         true <- nodes_equal?({:__aliases__, [], [Module.concat([env.module | parts])]}, right) do
+      true
+    else
+      _ ->
+        left
+        |> expand_aliases()
+        |> Zipper.subtree()
+        |> Zipper.node()
+        |> nodes_equal?(right)
+    end
   end
 
   def nodes_equal?(_left, %Zipper{}) do
@@ -631,14 +656,14 @@ defmodule Igniter.Code.Common do
 
   @spec expand_aliases(Zipper.t()) :: Zipper.t()
   def expand_aliases(zipper) do
-    case current_env(zipper) do
-      {:ok, env} ->
-        Zipper.traverse(zipper, fn x ->
-          x
-          |> Zipper.subtree()
-          |> Zipper.node()
-          |> case do
-            {:__aliases__, _, parts} ->
+    Zipper.traverse(zipper, fn x ->
+      x
+      |> Zipper.subtree()
+      |> Zipper.node()
+      |> case do
+        {:__aliases__, _, parts} ->
+          case current_env(zipper) do
+            {:ok, env} ->
               case Macro.Env.expand_alias(env, [], parts) do
                 {:alias, value} ->
                   Zipper.replace(x, {:__aliases__, [], Module.split(value)})
@@ -650,11 +675,11 @@ defmodule Igniter.Code.Common do
             _ ->
               x
           end
-        end)
 
-      _ ->
-        zipper
-    end
+        _ ->
+          x
+      end
+    end)
   rescue
     _ ->
       zipper
diff --git a/lib/igniter/code/module.ex b/lib/igniter/code/module.ex
index e54db65..7be88a5 100644
--- a/lib/igniter/code/module.ex
+++ b/lib/igniter/code/module.ex
@@ -4,6 +4,75 @@ defmodule Igniter.Code.Module do
   alias Igniter.Code.Common
   alias Sourceror.Zipper
 
+  @doc "Find or create module"
+  def find_and_update_or_create_module(igniter, module_name, contents, updater) do
+    igniter
+    |> Igniter.include_glob("lib/**/*.ex")
+    |> Map.get(:rewrite)
+    |> Enum.find_value(fn source ->
+      source
+      |> Rewrite.Source.get(:quoted)
+      |> Zipper.zip()
+      |> Igniter.Code.Common.move_to_zipper(fn zipper ->
+        with true <- Igniter.Code.Function.function_call?(zipper, :defmodule, 2),
+             {:ok, inner_zipper} <- Igniter.Code.Function.move_to_nth_argument(zipper, 0),
+             inner_zipper <- Igniter.Code.Common.expand_aliases(inner_zipper),
+             true <-
+               Igniter.Code.Common.nodes_equal?(
+                 inner_zipper,
+                 module_name
+               ) do
+          {:ok, inner_zipper}
+        else
+          _ ->
+            nil
+        end
+      end)
+      |> case do
+        {:ok, zipper} ->
+          {source, zipper}
+
+        _ ->
+          nil
+      end
+    end)
+    |> case do
+      {source, zipper} ->
+        case Common.move_to_do_block(zipper) do
+          {:ok, zipper} ->
+            case updater.(zipper) do
+              {:ok, zipper} ->
+                new_quoted =
+                  zipper
+                  |> Zipper.topmost()
+                  |> Zipper.node()
+
+                new_source = Rewrite.Source.update(source, :quoted, new_quoted)
+                %{igniter | rewrite: Rewrite.update!(igniter.rewrite, new_source)}
+
+              {:error, error} ->
+                Igniter.add_issue(igniter, error)
+
+              {:warning, error} ->
+                Igniter.add_warning(igniter, error)
+            end
+
+          _ ->
+            igniter
+        end
+
+      nil ->
+        contents =
+          """
+          defmodule #{inspect(module_name)} do
+            #{contents}
+          end
+          """
+
+        Igniter.create_new_elixir_file(igniter, proper_location(module_name), contents)
+    end
+  end
+
   @doc "Given a suffix, returns a module name with the prefix of the current project."
   @spec module_name(String.t()) :: module()
   def module_name(suffix) do
@@ -18,9 +87,9 @@ defmodule Igniter.Code.Module do
     iex> Igniter.Code.Module.proper_location(MyApp.Hello)
     "lib/my_app/hello.ex"
   """
-  @spec proper_location(igniter :: Igniter.t() | nil, module()) :: Path.t()
-  def proper_location(igniter \\ nil, module_name) do
-    do_proper_location(igniter, module_name, :lib)
+  @spec proper_location(module()) :: Path.t()
+  def proper_location(module_name) do
+    do_proper_location(module_name, :lib)
   end
 
   @doc """
@@ -35,9 +104,9 @@ defmodule Igniter.Code.Module do
     iex> Igniter.Code.Module.proper_test_location(MyApp.HelloTest)
     "test/my_app/hello_test.exs"
   """
-  @spec proper_test_location(igniter :: Igniter.t() | nil, module()) :: Path.t()
-  def proper_test_location(igniter \\ nil, module_name) do
-    do_proper_location(igniter, module_name, :test)
+  @spec proper_test_location(module()) :: Path.t()
+  def proper_test_location(module_name) do
+    do_proper_location(module_name, :test)
   end
 
   @doc """
@@ -49,9 +118,9 @@ defmodule Igniter.Code.Module do
     iex> Igniter.Code.Module.proper_test_support_location(MyApp.DataCase)
     "test/support/data_case.ex"
   """
-  @spec proper_test_support_location(igniter :: Igniter.t() | nil, module()) :: Path.t()
-  def proper_test_support_location(igniter \\ nil, module_name) do
-    do_proper_location(igniter, module_name, :test_support)
+  @spec proper_test_support_location(module()) :: Path.t()
+  def proper_test_support_location(module_name) do
+    do_proper_location(module_name, :test_support)
   end
 
   @doc false
@@ -149,7 +218,7 @@ defmodule Igniter.Code.Module do
     split_from_path == split
   end
 
-  defp do_proper_location(igniter, module_name, kind) do
+  defp do_proper_location(module_name, kind) do
     path =
       module_name
       |> Module.split()
@@ -174,35 +243,6 @@ defmodule Igniter.Code.Module do
         [_prefix | leading_rest] = leading
         Path.join(["test/support" | leading_rest] ++ ["#{last}.ex"])
     end
-    |> apply_leaf_module_configuration(igniter)
-  end
-
-  defp apply_leaf_module_configuration(path, nil), do: path
-
-  defp apply_leaf_module_configuration(path, igniter) do
-    case Igniter.Project.IgniterConfig.get(igniter, :leaf_module_location) do
-      :outside_folder ->
-        path
-
-      :inside_folder ->
-        path
-        |> Path.split()
-        |> Enum.reverse()
-        |> Enum.split(2)
-        |> case do
-          {[filename, last_folder_name], rest} ->
-            if Path.rootname(filename) == last_folder_name do
-              [last_folder_name <> Path.extname(filename) | rest]
-              |> Enum.reverse()
-              |> Path.join()
-            else
-              path
-            end
-
-          _ ->
-            path
-        end
-    end
   end
 
   def module?(zipper) do
diff --git a/lib/igniter/project/igniter_config.ex b/lib/igniter/project/igniter_config.ex
index d1661e8..6a999a4 100644
--- a/lib/igniter/project/igniter_config.ex
+++ b/lib/igniter/project/igniter_config.ex
@@ -54,7 +54,7 @@ defmodule Igniter.Project.IgniterConfig do
                 unquote(config[:default])
               end
 
-            # TODO: when we have a way to comment ahead of a keyword item
+            # when we have a way to comment ahead of a keyword item
             # we should comment the docs
             case Igniter.Code.Keyword.set_keyword_key(
                    zipper,
diff --git a/test/code/module_test.exs b/test/code/module_test.exs
index a6a279d..c9739b6 100644
--- a/test/code/module_test.exs
+++ b/test/code/module_test.exs
@@ -20,17 +20,101 @@ defmodule Igniter.Code.ModuleTest do
 
     assert "lib/foo/bar/bar.ex" in paths
     assert "lib/foo/bar/baz.ex" in paths
+  end
 
-    #   Igniter.Project.Config.configure(Igniter.new(), "fake.exs", :fake, [:foo, :bar], "baz")
+  test "modules can be found anywhere across the project" do
+    %{rewrite: rewrite} =
+      Igniter.new()
+      |> Igniter.create_new_elixir_file("lib/foo/bar.ex", """
+        defmodule Foo.Bar do
+          defmodule Baz do
+            10
+          end
+        end
+      """)
+      |> Igniter.Code.Module.find_and_update_or_create_module(
+        Foo.Bar.Baz,
+        """
+        20
+        """,
+        fn zipper ->
+          {:ok, Igniter.Code.Common.replace_code(zipper, 30)}
+        end
+      )
 
-    # config_file = Rewrite.source!(rewrite, "config/fake.exs")
+    contents =
+      rewrite
+      |> Rewrite.source!("lib/foo/bar.ex")
+      |> Rewrite.Source.get(:content)
 
-    # assert Source.from?(config_file, :string)
+    assert contents == """
+           defmodule Foo.Bar do
+             defmodule Baz do
+               30
+             end
+           end
+           """
+  end
 
-    # assert Source.get(config_file, :content) == """
-    #        import Config
-    #        config :fake, foo: [bar: "baz"]
-    #        """
-    # end
+  test "modules will be created if they do not exist, in the conventional place" do
+    %{rewrite: rewrite} =
+      Igniter.new()
+      |> Igniter.create_new_elixir_file("lib/foo/bar.ex", """
+      defmodule Foo.Bar do
+      end
+      """)
+      |> Igniter.Code.Module.find_and_update_or_create_module(
+        Foo.Bar.Baz,
+        """
+        20
+        """,
+        fn zipper ->
+          {:ok, Igniter.Code.Common.replace_code(zipper, 30)}
+        end
+      )
+
+    contents =
+      rewrite
+      |> Rewrite.source!("lib/foo/bar/baz.ex")
+      |> Rewrite.Source.get(:content)
+
+    assert contents == """
+           defmodule Foo.Bar.Baz do
+             20
+           end
+           """
+  end
+
+  test "modules will be created if they do not exist, in the conventional place, which can be configured" do
+    %{rewrite: rewrite} =
+      Igniter.new()
+      |> Igniter.assign(:igniter_exs,
+        leaf_module_location: :inside_folder
+      )
+      |> Igniter.create_new_elixir_file("lib/foo/bar/something.ex", """
+      defmodule Foo.Bar.Something do
+      end
+      """)
+      |> Igniter.Code.Module.find_and_update_or_create_module(
+        Foo.Bar,
+        """
+        20
+        """,
+        fn zipper ->
+          {:ok, Igniter.Code.Common.replace_code(zipper, 30)}
+        end
+      )
+      |> Igniter.prepare_for_write()
+
+    contents =
+      rewrite
+      |> Rewrite.source!("lib/foo/bar/bar.ex")
+      |> Rewrite.Source.get(:content)
+
+    assert contents == """
+           defmodule Foo.Bar do
+             20
+           end
+           """
   end
 end