diff --git a/flake.lock b/flake.lock
index eadaf3b..917ff4d 100644
--- a/flake.lock
+++ b/flake.lock
@@ -16,6 +16,21 @@
         "type": "github"
       }
     },
+    "nix-filter": {
+      "locked": {
+        "lastModified": 1666547822,
+        "narHash": "sha256-razwnAybPHyoAyhkKCwXdxihIqJi1G6e1XP4FQOJTEs=",
+        "owner": "numtide",
+        "repo": "nix-filter",
+        "rev": "1a3b735e13e90a8d2fd5629f2f8363bd7ffbbec7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "nix-filter",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1666244578,
@@ -35,6 +50,7 @@
     "root": {
       "inputs": {
         "flake-compat": "flake-compat",
+        "nix-filter": "nix-filter",
         "nixpkgs": "nixpkgs"
       }
     }
diff --git a/flake.nix b/flake.nix
index 05448d0..69c54c0 100644
--- a/flake.nix
+++ b/flake.nix
@@ -6,11 +6,15 @@
       url = "github:edolstra/flake-compat";
       flake = false;
     };
+    nix-filter = {
+      url = "github:numtide/nix-filter";
+    };
   };
 
   outputs = {
     self,
     nixpkgs,
+    nix-filter,
     ...
   }: let
     projname = "ak9im";
@@ -41,6 +45,8 @@
     );
     packages = forAllSystems (system: let
       baseurl = "https://git.dotya.ml/wanderer/ak9im/";
+      pkgs = nixpkgsFor.${system};
+      inherit (pkgs) lib overlays;
     in rec {
       p1 = pkgs.${system}.poetry2nix.mkPoetryApplication {
         name = "p1";
@@ -53,6 +59,84 @@
           platforms = nixpkgs.lib.platforms.linux ++ nixpkgs.lib.platforms.darwin;
         };
       };
+
+      p2 = with pkgs;
+        buildGo119Module rec {
+          pname = "p2";
+          buildInputs = [
+            go_1_19
+            gcc
+          ];
+          nativeBuildInputs = [pkgconfig];
+
+          overrideModAttrs = _: {
+            # GOPROXY = "direct";
+            GOFLAGS = "-buildmode=pie -trimpath -mod=readonly -modcacherw";
+          };
+
+          inherit version;
+          doCheck = false;
+          # use go.mod for managing go deps, instead of vendor-only dir
+          proxyVendor = true;
+          tags = []; # go "-tags" to build with
+          ldflags = [
+            "-s"
+            "-w"
+            "-X main.version=${version}"
+          ];
+
+          # dont't forget to update vendorSha256 whenever go.mod or go.sum change
+          vendorSha256 = "sha256-pQpattmS9VmO3ZIQUFn66az8GSmB4IvYhTTCFn6SUmo=";
+
+          # In 'nix develop', we don't need a copy of the source tree
+          # in the Nix store.
+          src = nix-filter.lib.filter {
+            # when in doubt, check out
+            # https://github.com/numtide/nix-filter#design-notes
+            # tl;dr: it'd be best to include folders, however there are
+            # currently issues with that approach.
+            root = lib.cleanSource ./p2;
+            exclude = [
+              ./p2/README.md
+
+              ./p1
+
+              ./flake.nix
+              ./flake.lock
+              ./default.nix
+              ./shell.nix
+              ./overlay.nix
+
+              ./README.md
+
+              ./.envrc
+              ./.gitattributes
+              ./.gitignore
+              ./.golangci.yml
+              ./.editorconfig
+              ./.pre-commit-config.yaml
+
+              # program output
+              ./out
+              ./res
+
+              # nix result symlink
+              ./result
+
+              # the entire .git folder
+              ./.git
+            ];
+          };
+
+          meta = {
+            description = "implementation of task 2 for ak9im";
+            homepage = "https://git.dotya.ml/wanderer/ak9im/p2";
+            license = lib.licenses.gpl3;
+            maintainers = ["wanderer"];
+            platforms = lib.platforms.linux ++ lib.platforms.darwin;
+          };
+        };
+
       default = p1;
     });
 
@@ -61,6 +145,10 @@
         type = "app";
         program = "${self.packages.${system}.${projname}}/bin/p1";
       };
+      p2 = {
+        type = "app";
+        program = "${self.packages.${system}.${projname}}/bin/p2";
+      };
       default = p1;
     });
 
@@ -85,6 +173,12 @@
     in {
       default = pkgs.${system}.mkShellNoCC {
         name = "${projname}-" + version;
+
+        GOFLAGS = "-buildmode=pie -trimpath -mod=readonly -modcacherw";
+        GOLDFLAGS = "-s -w -X main.version=${version}";
+        CGO_CFLAGS = "-g0 -Ofast -mtune=native -flto";
+        CGO_LDFLAGS = "-Wl,-O1,-sort-common,-as-needed,-z,relro,-z,now,-flto -pthread";
+
         shellHook = ''
           echo " -- in ${projname} dev shell..."
         '';
@@ -102,6 +196,11 @@
           python3Packages.matplotlib
           python3Packages.scipy
           poetry
+
+          go_1_19
+          go-tools
+          gopls
+          gofumpt
         ];
       };
     });