diff --git a/assessments/semiprimes/server/.formatter.exs b/assessments/semiprimes/server/.formatter.exs
new file mode 100644
index 000000000..d2cda26ed
--- /dev/null
+++ b/assessments/semiprimes/server/.formatter.exs
@@ -0,0 +1,4 @@
+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]
diff --git a/assessments/semiprimes/server/.gitignore b/assessments/semiprimes/server/.gitignore
new file mode 100644
index 000000000..db9704a85
--- /dev/null
+++ b/assessments/semiprimes/server/.gitignore
@@ -0,0 +1,24 @@
+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+server-*.tar
+
diff --git a/assessments/semiprimes/server/README.md b/assessments/semiprimes/server/README.md
new file mode 100644
index 000000000..f5a7dad59
--- /dev/null
+++ b/assessments/semiprimes/server/README.md
@@ -0,0 +1,21 @@
+# Server
+
+**TODO: Add description**
+
+## Installation
+
+If [available in Hex](https://hex.pm/docs/publish), the package can be installed
+by adding `server` to your list of dependencies in `mix.exs`:
+
+```elixir
+def deps do
+  [
+    {:server, "~> 0.1.0"}
+  ]
+end
+```
+
+Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
+and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
+be found at [https://hexdocs.pm/server](https://hexdocs.pm/server).
+
diff --git a/assessments/semiprimes/server/lib/server.ex b/assessments/semiprimes/server/lib/server.ex
new file mode 100644
index 000000000..7240fc342
--- /dev/null
+++ b/assessments/semiprimes/server/lib/server.ex
@@ -0,0 +1,18 @@
+defmodule Server do
+  @moduledoc """
+  Documentation for `Server`.
+  """
+
+  @doc """
+  Hello world.
+
+  ## Examples
+
+      iex> Server.hello()
+      :world
+
+  """
+  def hello do
+    :world
+  end
+end
diff --git a/assessments/semiprimes/server/mix.exs b/assessments/semiprimes/server/mix.exs
new file mode 100644
index 000000000..0efb638e1
--- /dev/null
+++ b/assessments/semiprimes/server/mix.exs
@@ -0,0 +1,27 @@
+defmodule Server.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :server,
+      version: "0.1.0",
+      elixir: "~> 1.10",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      {:cortex, "~> 0.1", only: [:dev, :test]}
+    ]
+  end
+end
diff --git a/assessments/semiprimes/server/mix.lock b/assessments/semiprimes/server/mix.lock
new file mode 100644
index 000000000..066a7cadd
--- /dev/null
+++ b/assessments/semiprimes/server/mix.lock
@@ -0,0 +1,4 @@
+%{
+  "cortex": {:hex, :cortex, "0.6.0", "8094830fae266eb0ae34d1a58983c0c49484341f5044fb4dfb81746647bd2993", [:mix], [{:file_system, "~> 0.2", [hex: :file_system, repo: "hexpm", optional: false]}], "hexpm", "d0ef5a2b1269626149118684dc4ea77dbfbc67017f4b4065b71dcefa26cfcc49"},
+  "file_system": {:hex, :file_system, "0.2.10", "fb082005a9cd1711c05b5248710f8826b02d7d1784e7c3451f9c1231d4fc162d", [:mix], [], "hexpm", "41195edbfb562a593726eda3b3e8b103a309b733ad25f3d642ba49696bf715dc"},
+}
diff --git a/assessments/semiprimes/server/test/server_test.exs b/assessments/semiprimes/server/test/server_test.exs
new file mode 100644
index 000000000..4fa9b617b
--- /dev/null
+++ b/assessments/semiprimes/server/test/server_test.exs
@@ -0,0 +1,8 @@
+defmodule ServerTest do
+  use ExUnit.Case
+  doctest Server
+
+  test "greets the world" do
+    assert Server.hello() == :world
+  end
+end
diff --git a/assessments/semiprimes/server/test/test_helper.exs b/assessments/semiprimes/server/test/test_helper.exs
new file mode 100644
index 000000000..869559e70
--- /dev/null
+++ b/assessments/semiprimes/server/test/test_helper.exs
@@ -0,0 +1 @@
+ExUnit.start()