diff --git a/.formatter.exs b/.formatter.exs
new file mode 100644
index 000000000..d2cda26ed
--- /dev/null
+++ b/.formatter.exs
@@ -0,0 +1,4 @@
+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]
diff --git a/.gitignore b/.gitignore
index b263cd10f..71f58e1c4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,10 +1,30 @@
-/_build
-/cover
-/deps
-/doc
+# 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").
+lambda_ethereum_consensus-*.tar
+
+# Temporary files, for example, from tests.
+/tmp/
+
 *.beam
 /config/*.secret.exs
 .elixir_ls/
diff --git a/Makefile b/Makefile
new file mode 100644
index 000000000..32f899108
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,13 @@
+.PHONY: iex deps test
+
+# Run an interactive terminal with the main supervisor setup.
+iex:
+	iex -S mix
+
+# Install mix dependencies.
+deps:
+	mix deps.get
+
+# Run tests
+test:
+	mix test
diff --git a/README.md b/README.md
index 38eee67d3..2a9a572cb 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,17 @@
-# lambda_ethereum_consensus
\ No newline at end of file
+# lambda_ethereum_consensus
+
+## Prerequisites
+
+- Elixir and mix [installed](https://elixir-lang.org/install.html) (e.g. with asdf, or brew).
+
+## Installing and running
+
+There are Makefile targets for these tasks.
+
+```shell
+make deps # Installs dependencies
+make iex  # Runs a terminal with the application started
+make test # Runs tests
+```
+
+The iex terminal can be closed by pressing ctrl+c two times.
diff --git a/lib/lambda_ethereum_consensus.ex b/lib/lambda_ethereum_consensus.ex
new file mode 100644
index 000000000..d36e512fe
--- /dev/null
+++ b/lib/lambda_ethereum_consensus.ex
@@ -0,0 +1,18 @@
+defmodule LambdaEthereumConsensus do
+  @moduledoc """
+  Documentation for `LambdaEthereumConsensus`.
+  """
+
+  @doc """
+  Hello world.
+
+  ## Examples
+
+      iex> LambdaEthereumConsensus.hello()
+      :world
+
+  """
+  def hello do
+    :world
+  end
+end
diff --git a/lib/lambda_ethereum_consensus/application.ex b/lib/lambda_ethereum_consensus/application.ex
new file mode 100644
index 000000000..da03b2ae7
--- /dev/null
+++ b/lib/lambda_ethereum_consensus/application.ex
@@ -0,0 +1,20 @@
+defmodule LambdaEthereumConsensus.Application do
+  # See https://hexdocs.pm/elixir/Application.html
+  # for more information on OTP Applications
+  @moduledoc false
+
+  use Application
+
+  @impl true
+  def start(_type, _args) do
+    children = [
+      # Starts a worker by calling: LambdaEthereumConsensus.Worker.start_link(arg)
+      # {LambdaEthereumConsensus.Worker, arg}
+    ]
+
+    # See https://hexdocs.pm/elixir/Supervisor.html
+    # for other strategies and supported options
+    opts = [strategy: :one_for_one, name: LambdaEthereumConsensus.Supervisor]
+    Supervisor.start_link(children, opts)
+  end
+end
diff --git a/mix.exs b/mix.exs
new file mode 100644
index 000000000..b9aa7a504
--- /dev/null
+++ b/mix.exs
@@ -0,0 +1,29 @@
+defmodule LambdaEthereumConsensus.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :lambda_ethereum_consensus,
+      version: "0.1.0",
+      elixir: "~> 1.14",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger],
+      mod: {LambdaEthereumConsensus.Application, []}
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
+    ]
+  end
+end
diff --git a/test/lambda_ethereum_consensus_test.exs b/test/lambda_ethereum_consensus_test.exs
new file mode 100644
index 000000000..9c2661c74
--- /dev/null
+++ b/test/lambda_ethereum_consensus_test.exs
@@ -0,0 +1,8 @@
+defmodule LambdaEthereumConsensusTest do
+  use ExUnit.Case
+  doctest LambdaEthereumConsensus
+
+  test "greets the world" do
+    assert LambdaEthereumConsensus.hello() == :world
+  end
+end
diff --git a/test/test_helper.exs b/test/test_helper.exs
new file mode 100644
index 000000000..869559e70
--- /dev/null
+++ b/test/test_helper.exs
@@ -0,0 +1 @@
+ExUnit.start()