diff --git a/.gitignore b/.gitignore
index 125bfe3..5d1242b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -114,6 +114,10 @@ ENV/
 env.bak/
 venv.bak/
 
+#direnv
+.envrc
+.direnv
+
 # Spyder project settings
 .spyderproject
 .spyproject
diff --git a/do.sh b/do.sh
index 2bbaaaf..ccea975 100644
--- a/do.sh
+++ b/do.sh
@@ -4,25 +4,47 @@
 
 set -Eeuo pipefail # -e "Automatic exit from bash shell script on error"  -u "Treat unset variables and parameters as errors"
 
+checknix() {
+	if [[ "${DO_NIX_CUSTOM:=0}" -eq 1 ]]; then
+		echo "In an interactive nix env."
+	else
+		echo "Using poetry as runner, no nix detected."
+	fi
+}
+
 build() {
 	echo "I am ${FUNCNAME[0]}ing"
 	poetry build
 }
 
-test() {
-	echo "I am ${FUNCNAME[0]}ing"
-	poetry run flake8 pdme tests
-	poetry run mypy pdme
-	poetry run pytest
-}
-
 fmt() {
-	poetry run black .
+	if [[ "${DO_NIX_CUSTOM:=0}" -eq 1 ]]; then
+		black .
+	else
+		poetry run black .
+	fi
 	find . -type f -name "*.py" -exec sed -i -e 's/    /\t/g' {} \;
 }
 
+test() {
+	echo "I am ${FUNCNAME[0]}ing"
+	if [[ "${DO_NIX_CUSTOM:=0}" -eq 1 ]]; then
+		flake8 pdme tests
+		mypy pdme
+		pytest
+	else
+		poetry run flake8 pdme tests
+		poetry run mypy pdme
+		poetry run pytest
+	fi
+}
+
 htmlcov() {
-	poetry run pytest --cov-report=html
+	if [[ "${DO_NIX_CUSTOM:=0}" -eq 1 ]]; then
+		pytest --cov-report=html
+	else
+		poetry run pytest --cov-report=html
+	fi
 }
 
 release() {
@@ -30,7 +52,7 @@ release() {
 }
 
 all() {
-	build && test
+	build && fmt && test
 }
 
 "$@" # <- execute the task
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..971b191
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,95 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1648297722,
+        "narHash": "sha256-W+qlPsiZd8F3XkzXOzAoR+mpFqzm3ekQkJNa+PIh1BQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "0f8662f1319ad6abf89b3380dd2722369fc51ade",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "0f8662f1319ad6abf89b3380dd2722369fc51ade",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "locked": {
+        "lastModified": 1653893745,
+        "narHash": "sha256-0jntwV3Z8//YwuOjzhV2sgJJPt+HY6KhU7VZUL0fKZQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "1ed9fb1935d260de5fe1c2f7ee0ebaae17ed2fa1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1648854265,
+        "narHash": "sha256-e/RlfodBOMr2SH9diDPYMraTWvhOWSSsXDQikHFdUvM=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e194871435cad8ffb1d64b64fb7df3b2b8a10088",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e194871435cad8ffb1d64b64fb7df3b2b8a10088",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1655043425,
+        "narHash": "sha256-A+oT+aQGhW5lXy8H0cqBLsYtgcnT5glmGOXWQDcGw6I=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "914ef51ffa88d9b386c71bdc88bffc5273c08ada",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "poetry2nix": {
+      "inputs": {
+        "flake-utils": "flake-utils_2",
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1654921554,
+        "narHash": "sha256-hkfMdQAHSwLWlg0sBVvgrQdIiBP45U1/ktmFpY4g2Mo=",
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "rev": "7b71679fa7df00e1678fc3f1d1d4f5f372341b63",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "rev": "7b71679fa7df00e1678fc3f1d1d4f5f372341b63",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "poetry2nix": "poetry2nix"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..abeac54
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,55 @@
+{
+  description = "Application packaged using poetry2nix";
+
+  inputs.flake-utils.url = "github:numtide/flake-utils?rev=0f8662f1319ad6abf89b3380dd2722369fc51ade";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs?rev=e194871435cad8ffb1d64b64fb7df3b2b8a10088";
+  inputs.poetry2nix.url = "github:nix-community/poetry2nix?rev=7b71679fa7df00e1678fc3f1d1d4f5f372341b63";
+
+  outputs = { self, nixpkgs, flake-utils, poetry2nix }:
+    {
+      # Nixpkgs overlay providing the application
+      overlay = nixpkgs.lib.composeManyExtensions [
+        poetry2nix.overlay
+        (final: prev: {
+          # The application
+          pdme = prev.poetry2nix.mkPoetryApplication {
+            overrides = [
+              prev.poetry2nix.defaultPoetryOverrides
+            ];
+            projectDir = ./.;
+          };
+          pdmeEnv = prev.poetry2nix.mkPoetryEnv {
+            overrides = [
+              prev.poetry2nix.defaultPoetryOverrides
+            ];
+            projectDir = ./.;
+          };
+        })
+      ];
+    } // (flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ self.overlay ];
+        };
+      in
+      {
+        apps = {
+          pdme = pkgs.pdme;
+        };
+
+        defaultApp = pkgs.pdme;
+        devShell = pkgs.mkShell {
+          buildInputs = [
+            pkgs.poetry
+            pkgs.pdmeEnv
+            pkgs.pdme
+          ];
+          shellHook = ''
+            export DO_NIX_CUSTOM=1
+          '';
+          packages = [ pkgs.nodejs-16_x ];
+        };
+
+      }));
+}