diff --git a/.envrc b/.envrc
new file mode 100644
index 000000000..5bf8fc159
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,3 @@
+source_url "https://raw.githubusercontent.com/cachix/devenv/95f329d49a8a5289d31e0982652f7058a189bfca/direnvrc" "sha256-d+8cBpDfDBj41inrADaJt+bDWhOktwslgoP5YiGJ1v0="
+
+use devenv
\ No newline at end of file
diff --git a/.github/workflows/devenv.yml b/.github/workflows/devenv.yml
new file mode 100644
index 000000000..60cbf097b
--- /dev/null
+++ b/.github/workflows/devenv.yml
@@ -0,0 +1,25 @@
+name: Devenv
+
+on:
+  push:
+    branches: [ main ]
+    paths:
+      - "/devenv*"
+  pull_request:
+    branches: [ main ]
+    paths-ignore:
+      - "/devenv*"
+
+jobs:
+  test-nix-env:
+   runs-on: ubuntu-latest
+   steps:
+    - uses: actions/checkout@v4
+    - uses: cachix/install-nix-action@v26
+    - uses: cachix/cachix-action@v14
+      with:
+        name: devenv
+    - name: Install devenv.sh
+      run: nix profile install nixpkgs#devenv
+    - name: Build the devenv shell and run any git hooks
+      run: devenv test
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 6eeecd5db..64e3bfedd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,4 +20,11 @@ book
 
 # Coverage
 coverage
-.nyc_output
\ No newline at end of file
+.nyc_output
+
+# Devenv
+.devenv*
+devenv.local.nix
+
+# direnv
+.direnv
\ No newline at end of file
diff --git a/changelog.d/993.misc b/changelog.d/993.misc
new file mode 100644
index 000000000..e6001246a
--- /dev/null
+++ b/changelog.d/993.misc
@@ -0,0 +1 @@
+Add devenv development files.
diff --git a/devenv.lock b/devenv.lock
new file mode 100644
index 000000000..32571958a
--- /dev/null
+++ b/devenv.lock
@@ -0,0 +1,175 @@
+{
+  "nodes": {
+    "devenv": {
+      "locked": {
+        "dir": "src/modules",
+        "lastModified": 1732585607,
+        "owner": "cachix",
+        "repo": "devenv",
+        "rev": "a520f05c40ebecaf5e17064b27e28ba8e70c49fb",
+        "treeHash": "18c0c037ca6ab98acc83bf17a1abefac00d77e65",
+        "type": "github"
+      },
+      "original": {
+        "dir": "src/modules",
+        "owner": "cachix",
+        "repo": "devenv",
+        "type": "github"
+      }
+    },
+    "fenix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-analyzer-src": "rust-analyzer-src"
+      },
+      "locked": {
+        "lastModified": 1732689334,
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "a8a983027ca02b363dfc82fbe3f7d9548a8d3dce",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1732722421,
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "9ed2ac151eada2306ca8c418ebd97807bb08f6ac",
+        "treeHash": "89dbb8f9bb36708ea4455ee2225a9c60c950f2f7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "pre-commit-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1709087332,
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
+        "treeHash": "ca14199cabdfe1a06a7b1654c76ed49100a689f9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1716977621,
+        "owner": "cachix",
+        "repo": "devenv-nixpkgs",
+        "rev": "4267e705586473d3e5c8d50299e71503f16a6fb6",
+        "treeHash": "6d9f1f7ca0faf1bc2eeb397c78a49623260d3412",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "ref": "rolling",
+        "repo": "devenv-nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-stable": {
+      "locked": {
+        "lastModified": 1732632634,
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "6f6076c37180ea3a916f84928cf3a714c5207a30",
+        "treeHash": "1e15b0cb2baeffc40a2c957508052031b879c401",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-24.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-upstream": {
+      "locked": {
+        "lastModified": 1732350895,
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "0c582677378f2d9ffcb01490af2f2c678dcb29d3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-24.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "pre-commit-hooks": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "gitignore": "gitignore",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "nixpkgs-stable": "nixpkgs-stable"
+      },
+      "locked": {
+        "lastModified": 1732021966,
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "rev": "3308484d1a443fc5bc92012435d79e80458fe43c",
+        "treeHash": "434cf02841a1faf9e53437604ffa4b9a92669bff",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "devenv": "devenv",
+        "fenix": "fenix",
+        "nixpkgs": "nixpkgs",
+        "nixpkgs-upstream": "nixpkgs-upstream",
+        "pre-commit-hooks": "pre-commit-hooks"
+      }
+    },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1732633904,
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "8d5e91c94f80c257ce6dbdfba7bd63a5e8a03fa6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/devenv.nix b/devenv.nix
new file mode 100644
index 000000000..ad3d1cf4a
--- /dev/null
+++ b/devenv.nix
@@ -0,0 +1,24 @@
+{ pkgs, lib, config, inputs, ... }:
+let
+  pkgs-upstream = import inputs.nixpkgs-upstream { system = pkgs.stdenv.system; };
+in
+{
+  packages = [ pkgs.git pkgs.gcc pkgs.pkg-config pkgs.openssl ];
+
+  # https://devenv.sh/tests/
+  enterTest = ''
+    echo "Running tests"
+    yarn
+  '';
+
+  # https://devenv.sh/services/
+  services.redis.enable = true;
+
+  # https://devenv.sh/languages/
+  languages.typescript.enable = true;
+  languages.javascript.yarn.enable = true;
+  languages.javascript.enable = true;
+  languages.javascript.package = pkgs-upstream.nodejs_20;
+  languages.rust.enable = true;
+  languages.rust.channel = "stable";
+}
diff --git a/devenv.yaml b/devenv.yaml
new file mode 100644
index 000000000..c53502e25
--- /dev/null
+++ b/devenv.yaml
@@ -0,0 +1,10 @@
+inputs:
+  nixpkgs:
+    url: github:cachix/devenv-nixpkgs/rolling
+  fenix:
+    url: github:nix-community/fenix
+    inputs:
+      nixpkgs:
+        follows: nixpkgs
+  nixpkgs-upstream:
+    url: github:NixOS/nixpkgs/nixos-24.11
\ No newline at end of file