diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..6de8a8a
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,3 @@
+source_url "https://raw.githubusercontent.com/cachix/devenv/d1f7b48e35e6dee421cfd0f51481d17f77586997/direnvrc" "sha256-YBzqskFZxmNb3kYVoKD9ZixoPXJh1C9ZvTLGFRkauZ0="
+
+use devenv
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index ea8c4bf..3b783b3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,6 @@
 /target
+
+# Devenv
+.devenv*
+devenv.local.nix
+
diff --git a/devenv.lock b/devenv.lock
new file mode 100644
index 0000000..89a8bb7
--- /dev/null
+++ b/devenv.lock
@@ -0,0 +1,138 @@
+{
+  "nodes": {
+    "devenv": {
+      "locked": {
+        "dir": "src/modules",
+        "lastModified": 1679052952,
+        "narHash": "sha256-gjt2HNYf/UcimQ7A7nUaDLHshIedeXj2YCfj9+BLFbs=",
+        "owner": "cachix",
+        "repo": "devenv",
+        "rev": "02cf4ceafb81a49918c97db723454334b1ebb7d1",
+        "type": "github"
+      },
+      "original": {
+        "dir": "src/modules",
+        "owner": "cachix",
+        "repo": "devenv",
+        "type": "github"
+      }
+    },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1673956053,
+        "narHash": "sha256-4gtG9iQuiKITOjNQQeQIpoIB6b16fm+504Ch3sNKLd8=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "35bb57c0c8d8b62bbfd284272c928ceb64ddbde9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1667395993,
+        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "pre-commit-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1660459072,
+        "narHash": "sha256-8DFJjXG8zqoONA1vXtgeKXy68KdJL5UaXR8NtVMUbx8=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "a20de23b925fd8264fd7fad6454652e142fd7f73",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1678875422,
+        "narHash": "sha256-T3o6NcQPwXjxJMn2shz86Chch4ljXgZn746c2caGxd8=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "126f49a01de5b7e35a43fd43f891ecf6d3a51459",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-stable": {
+      "locked": {
+        "lastModified": 1678872516,
+        "narHash": "sha256-/E1YwtMtFAu2KUQKV/1+KFuReYPANM2Rzehk84VxVoc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "9b8e5abb18324c7fe9f07cb100c3cd4a29cda8b8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-22.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "pre-commit-hooks": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "flake-utils": "flake-utils",
+        "gitignore": "gitignore",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "nixpkgs-stable": "nixpkgs-stable"
+      },
+      "locked": {
+        "lastModified": 1678976941,
+        "narHash": "sha256-skNr08frCwN9NO+7I77MjOHHAw+L410/37JknNld+W4=",
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "rev": "32b1dbedfd77892a6e375737ef04d8efba634e9e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "devenv": "devenv",
+        "nixpkgs": "nixpkgs",
+        "pre-commit-hooks": "pre-commit-hooks"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/devenv.nix b/devenv.nix
new file mode 100644
index 0000000..bd3fcae
--- /dev/null
+++ b/devenv.nix
@@ -0,0 +1,24 @@
+{ config, lib, pkgs, ... }:
+
+{
+  processes.prometheus = {
+    exec = lib.concatStringsSep " " [
+      "${pkgs.prometheus}/bin/prometheus"
+      "--storage.tsdb.path=${config.env.DEVENV_STATE}/prometheus"
+      "--config.file=${pkgs.writeText "prometheus.yml" (builtins.toJSON {
+        global.scrape_interval = "5s";
+        scrape_configs = [
+          {
+            job_name = "fernglas";
+            static_configs = [
+              {
+                targets = [ "localhost:3000" ];
+              }
+            ];
+          }
+        ];
+      })}"
+      "--web.listen-address=[::]:9090"
+    ];
+  };
+}
diff --git a/devenv.yaml b/devenv.yaml
new file mode 100644
index 0000000..c7cb5ce
--- /dev/null
+++ b/devenv.yaml
@@ -0,0 +1,3 @@
+inputs:
+  nixpkgs:
+    url: github:NixOS/nixpkgs/nixpkgs-unstable