diff --git a/.envrc b/.envrc
new file mode 100644
index 00000000000..3550a30f2de
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake
diff --git a/.gitignore b/.gitignore
index 1ef282a9f82..4f60b68dbe8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,3 +16,5 @@ __pycache__
 
 # clangd
 app/.cache/
+
+.direnv
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 00000000000..8087ac95938
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,64 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": [
+          "systems"
+        ]
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1754651824,
+        "narHash": "sha256-aB7ft6njy9EJfuW+rdToNChfRrHNRw/yTg5cSEnG+HI=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b069b7c1e2fe1a3a24221428558bf44128d3d5c8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "systems": "systems"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 00000000000..d12729286fa
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,53 @@
+{
+  description = "ZMK/Zephyr dev flake";
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    systems.url = "github:nix-systems/default";
+    flake-utils = {
+      url = "github:numtide/flake-utils";
+      inputs.systems.follows = "systems";
+    };
+  };
+
+  outputs =
+    { nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          packages = with pkgs; [
+            python3Full
+            python313Packages.west
+            # From requirements-base.txt
+            python313Packages.pyelftools
+            python313Packages.pyyaml
+            python313Packages.pykwalify
+            # python313Packages.canopen # Try to update later, it's proken for now. https://github.com/NixOS/nixpkgs/pull/423735#pullrequestreview-3036010982
+            python313Packages.packaging
+            python313Packages.patool
+            python313Packages.psutil
+            python313Packages.pylink-square
+            python313Packages.pyserial
+            python313Packages.requests
+            python313Packages.semver
+            python313Packages.tqdm
+            python313Packages.reuse
+            python313Packages.anytree
+            python313Packages.intelhex
+            # From requirements-extras.txt
+            python313Packages.gitpython
+            gitlint
+            python313Packages.junit2html
+            python313Packages.lpc-checksum
+            python313Packages.spsdk
+            python313Packages.pillow
+            python313Packages.pygithub
+            python313Packages.graphviz
+          ];
+        };
+      }
+    );
+}