diff --git a/default.nix b/default.nix
new file mode 100644
index 0000000000..afc67a8cc2
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,88 @@
+let
+
+  nixpkgs = (import <nixpkgs> {}).pkgs.fetchFromGitHub {
+    owner = "NixOS"; repo = "nixpkgs";
+    rev = "0011f9065a1ad1da4db67bec8d535d91b0a78fba"; # nixos-unstable
+    sha256 = "0m662mibyxqmp83zdhsi084p2h90268h3i8bfk3b2q8pbjz89yx2";
+  };
+
+in with import nixpkgs {}; {
+  main = let
+    dnsimple = python27Packages.buildPythonPackage rec {
+      name = "dnsimple-${version}";
+      version = "0.3.6";
+
+      src = pkgs.fetchurl {
+        url = "mirror://pypi/d/dnsimple/${name}.tar.gz";
+        sha256 = "0cc7v6wn246n3gjpzy8aq8v3xbrxl9a423b84i2z2cjjbq8b7fvf";
+      };
+
+      propagatedBuildInputs = [ python27Packages.requests ];
+    };
+  in (buildFHSUserEnv {
+    name = "main";
+    targetPkgs = pkgs: (with pkgs; [ ansible2 curl dnsimple docker gnumake git google-cloud-sdk openssh python27Full python27Packages.libcloud python27Packages.pycrypto python27Packages.requests rsync ] ++ python27Packages.libcloud.propagatedBuildInputs ++ python27Packages.pycrypto.propagatedBuildInputs ++ dnsimple.propagatedBuildInputs);
+    profile = ''
+      source .env.local;
+      export PYTHONPATH="/usr/lib/python2.7/site-packages"
+    '';
+  }).env;
+
+  api-docs = stdenv.mkDerivation {
+    name = "api-docs";
+    buildInputs = [ gcc pkgconfig nodejs-6_x ];
+    shellHook = ''
+      source .env.local
+      cd api-docs
+    '';
+  };
+
+  ashes = let
+    flow25 = stdenv.lib.overrideDerivation flow (oldAttrs : rec {
+      name = "flow-${version}";
+      version = "0.25.0";
+
+      src = fetchFromGitHub {
+        owner = "facebook";
+        repo = "flow";
+        rev = "v${version}";
+        sha256 = "1v82phl1cb10p0ggjq9w6a0bcysjxwgmlqsp9263n3j52dl74yi8";
+      };
+    });
+  in stdenv.mkDerivation {
+    name = "ashes";
+    buildInputs = [ gcc pkgconfig fontconfig yarn cairo libpng pixman nodejs-6_x flow25 ];
+    shellHook = ''
+      source .env.local
+      cd ashes
+      ln -sf `readlink -f $(which flow)` node_modules/flow-bin/vendor/flow
+    '';
+  };
+
+  green-river = stdenv.mkDerivation {
+    name = "green-river";
+    buildInputs = [ openjdk sbt ];
+    shellHook = ''
+      source .env.local
+      cd green-river
+    '';
+  };
+
+  middlewarehouse = stdenv.mkDerivation {
+    name = "middlewarehouse";
+    buildInputs = [ go glide ];
+    shellHook = ''
+      source .env.local
+      cd middlewarehouse
+    '';
+  };
+
+  phoenix = stdenv.mkDerivation {
+    name = "phoenix";
+    buildInputs = [ openjdk sbt ];
+    shellHook = ''
+      source .env.local
+      cd phoenix-scala
+    '';
+  };
+}