diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..89ee1f4
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,83 @@
+/* Based on: https://github.com/srid/haskell-template */
+
+{
+  description = "Mulky Backups via Bupstash";
+
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+    flake-compat = {
+      url = "github:edolstra/flake-compat";
+      flake = false;
+    };
+  };
+
+  outputs = inputs@{ self, nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachSystem [ "x86_64-linux" "x86_64-darwin" ] (system:
+      let
+        overlays = [ ];
+
+        pkgs =
+          import nixpkgs { inherit system overlays; config.allowBroken = true; };
+
+        co-log-src = pkgs.fetchgit
+          {
+            url = "https://github.com/kowainik/co-log";
+            sha256 = "sha256-XV1xh3aBRY2XwWjGRkd7F2DHf3zTeeFawHJzf05eaWE"; # pkgs.lib.fakeSha256;
+            rev = "72fbe394b437c698d574cd7604ad3f7f807383e0";
+            fetchSubmodules = false;
+          };
+
+        project = returnShellEnv:
+          pkgs.haskellPackages.developPackage {
+            inherit returnShellEnv;
+
+            name = "mulkup";
+
+            root = pkgs.nix-gitignore.gitignoreSource [ ] ./.;
+
+            withHoogle = false;
+
+            overrides = self: super: with pkgs.haskell.lib; {
+              # Use callCabal2nix to override Haskell dependencies here
+              # cf. https://tek.brick.do/K3VXJd8mEKO7
+
+              co-log-polysemy = pkgs.haskell.lib.dontCheck
+                (self.callCabal2nixWithOptions "co-log-polysemy" co-log-src "--subpath=co-log-polysemy" { });
+
+              doctest = pkgs.haskell.lib.dontCheck
+                (self.callHackage "doctest" "0.16.3" { });
+
+              optics = pkgs.haskell.lib.dontCheck
+                (self.callHackage "optics" "0.4" { });
+              optics-core = pkgs.haskell.lib.dontCheck
+                (self.callHackage "optics-core" "0.4" { });
+              optics-th = pkgs.haskell.lib.dontCheck
+                (self.callHackage "optics-th" "0.4" { });
+              optics-extra = pkgs.haskell.lib.dontCheck (
+                self.callHackageDirect
+                  {
+                    pkg = "optics-extra";
+                    ver = "0.4";
+                    sha256 = "sha256-oKV8oF0oNHyuActOA7uxBkBzlTgG8LapcKrApa2Pg6U=";
+                  }
+                  { });
+
+            };
+
+            modifier = drv:
+              pkgs.haskell.lib.addBuildTools drv (with pkgs.haskellPackages;
+              [
+                cabal-fmt
+                cabal-install
+                ghcid
+                haskell-language-server
+                ormolu
+              ]);
+          };
+
+      in
+      {
+        defaultPackage = project false;
+        devShell = project true;
+      });
+}