diff --git a/.envrc b/.envrc
index ce04063..3550a30 100644
--- a/.envrc
+++ b/.envrc
@@ -1,5 +1 @@
-#!/usr/bin/env bash
-
-eval "$(devenv direnvrc)"
-
-use devenv
+use flake
diff --git a/.forgejo/workflows/ci.yml b/.forgejo/workflows/ci.yml
new file mode 100644
index 0000000..6ce781f
--- /dev/null
+++ b/.forgejo/workflows/ci.yml
@@ -0,0 +1,27 @@
+name: Continuous Integration
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  check:
+    name: Lint, Check & Test
+    runs-on: nix
+
+    steps:
+      - name: Check out Repository
+        uses: https://git.konstantinfickel.de/actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
+      - run: nix --version
+      - run: nix flake check
+
+  build:
+    name: Build Package
+    runs-on: nix
+
+    steps:
+      - name: Check out Repository
+        uses: https://git.konstantinfickel.de/actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
+      - run: nix build
diff --git a/.gitignore b/.gitignore
index c37e89c..20f2ba9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,18 @@
-*.pdf
+# Python-generated files
+__pycache__/
+*.py[oc]
+build/
+dist/
+wheels/
+*.egg-info
+
+# Virtual environments
+.venv
+
 .devenv
-.devenv.flake.nix
 .direnv
+.devenv.flake.nix
 .pre-commit-config.yaml
+
+# Nix
 result
-__pycache__
diff --git a/devenv.lock b/devenv.lock
deleted file mode 100644
index 0efeec0..0000000
--- a/devenv.lock
+++ /dev/null
@@ -1,103 +0,0 @@
-{
-  "nodes": {
-    "devenv": {
-      "locked": {
-        "dir": "src/modules",
-        "lastModified": 1772735645,
-        "owner": "cachix",
-        "repo": "devenv",
-        "rev": "89a61cb68c38465f144b1f0cc98e5116fd13c0ef",
-        "type": "github"
-      },
-      "original": {
-        "dir": "src/modules",
-        "owner": "cachix",
-        "repo": "devenv",
-        "type": "github"
-      }
-    },
-    "flake-compat": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1767039857,
-        "owner": "NixOS",
-        "repo": "flake-compat",
-        "rev": "5edf11c44bc78a0d334f6334cdaf7d60d732daab",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "repo": "flake-compat",
-        "type": "github"
-      }
-    },
-    "git-hooks": {
-      "inputs": {
-        "flake-compat": "flake-compat",
-        "gitignore": "gitignore",
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1772665116,
-        "owner": "cachix",
-        "repo": "git-hooks.nix",
-        "rev": "39f53203a8458c330f61cc0759fe243f0ac0d198",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cachix",
-        "repo": "git-hooks.nix",
-        "type": "github"
-      }
-    },
-    "gitignore": {
-      "inputs": {
-        "nixpkgs": [
-          "git-hooks",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1762808025,
-        "owner": "hercules-ci",
-        "repo": "gitignore.nix",
-        "rev": "cb5e3fdca1de58ccbc3ef53de65bd372b48f567c",
-        "type": "github"
-      },
-      "original": {
-        "owner": "hercules-ci",
-        "repo": "gitignore.nix",
-        "type": "github"
-      }
-    },
-    "nixpkgs": {
-      "locked": {
-        "lastModified": 1772674223,
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "66d9241e3dc2296726dc522e62dbfe89c7b449f3",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "root": {
-      "inputs": {
-        "devenv": "devenv",
-        "git-hooks": "git-hooks",
-        "nixpkgs": "nixpkgs",
-        "pre-commit-hooks": [
-          "git-hooks"
-        ]
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}
diff --git a/devenv.nix b/devenv.nix
deleted file mode 100644
index f038c0a..0000000
--- a/devenv.nix
+++ /dev/null
@@ -1,38 +0,0 @@
-{
-  pkgs,
-  ...
-}:
-{
-  languages.python = {
-    enable = true;
-    uv.enable = true;
-  };
-
-  packages = [
-    pkgs.commitizen
-    pkgs.pre-commit
-    pkgs.ruff
-  ];
-
-  env.LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath [
-    pkgs.glib
-    pkgs.pango
-    pkgs.harfbuzz
-    pkgs.fontconfig
-    pkgs.gdk-pixbuf
-  ];
-
-  git-hooks = {
-    enable = true;
-    hooks = {
-      ruff.enable = true;
-      ruff-format.enable = true;
-      basedpyright = {
-        enable = true;
-        entry = "uv run basedpyright";
-        types = [ "python" ];
-      };
-      commitizen.enable = true;
-    };
-  };
-}
diff --git a/devenv.yaml b/devenv.yaml
deleted file mode 100644
index c7cb5ce..0000000
--- a/devenv.yaml
+++ /dev/null
@@ -1,3 +0,0 @@
-inputs:
-  nixpkgs:
-    url: github:NixOS/nixpkgs/nixpkgs-unstable
diff --git a/flake.lock b/flake.lock
index f2697ec..497a3a5 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,30 +1,71 @@
 {
   "nodes": {
-    "flake-utils": {
-      "inputs": {
-        "systems": "systems"
-      },
+    "flake-compat": {
+      "flake": false,
       "locked": {
-        "lastModified": 1731533236,
-        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "lastModified": 1767039857,
+        "narHash": "sha256-vNpUSpF5Nuw8xvDLj2KCwwksIbjua2LZCqhV1LNRDns=",
+        "owner": "NixOS",
+        "repo": "flake-compat",
+        "rev": "5edf11c44bc78a0d334f6334cdaf7d60d732daab",
         "type": "github"
       },
       "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
+        "owner": "NixOS",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "git-hooks": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "gitignore": "gitignore",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1772665116,
+        "narHash": "sha256-XmjUDG/J8Z8lY5DVNVUf5aoZGc400FxcjsNCqHKiKtc=",
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "rev": "39f53203a8458c330f61cc0759fe243f0ac0d198",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "git-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1709087332,
+        "narHash": "sha256-HG2cCnktfHsKV0s4XW83gU3F57gaTljL9KNSuG6bnQs=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
         "type": "github"
       }
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1746232882,
-        "narHash": "sha256-MHmBH2rS8KkRRdoU/feC/dKbdlMkcNkB5mwkuipVHeQ=",
+        "lastModified": 1772624091,
+        "narHash": "sha256-QKyJ0QGWBn6r0invrMAK8dmJoBYWoOWy7lN+UHzW1jc=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "7a2622e2c0dbad5c4493cb268aba12896e28b008",
+        "rev": "80bdc1e5ce51f56b19791b52b2901187931f5353",
         "type": "github"
       },
       "original": {
@@ -34,24 +75,81 @@
         "type": "github"
       }
     },
-    "root": {
+    "pyproject-build-systems": {
       "inputs": {
-        "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs"
-      }
-    },
-    "systems": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "pyproject-nix": [
+          "pyproject-nix"
+        ],
+        "uv2nix": [
+          "uv2nix"
+        ]
+      },
       "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "lastModified": 1772555609,
+        "narHash": "sha256-3BA3HnUvJSbHJAlJj6XSy0Jmu7RyP2gyB/0fL7XuEDo=",
+        "owner": "pyproject-nix",
+        "repo": "build-system-pkgs",
+        "rev": "c37f66a953535c394244888598947679af231863",
         "type": "github"
       },
       "original": {
-        "owner": "nix-systems",
-        "repo": "default",
+        "owner": "pyproject-nix",
+        "repo": "build-system-pkgs",
+        "type": "github"
+      }
+    },
+    "pyproject-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1771518446,
+        "narHash": "sha256-nFJSfD89vWTu92KyuJWDoTQJuoDuddkJV3TlOl1cOic=",
+        "owner": "pyproject-nix",
+        "repo": "pyproject.nix",
+        "rev": "eb204c6b3335698dec6c7fc1da0ebc3c6df05937",
+        "type": "github"
+      },
+      "original": {
+        "owner": "pyproject-nix",
+        "repo": "pyproject.nix",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "git-hooks": "git-hooks",
+        "nixpkgs": "nixpkgs",
+        "pyproject-build-systems": "pyproject-build-systems",
+        "pyproject-nix": "pyproject-nix",
+        "uv2nix": "uv2nix"
+      }
+    },
+    "uv2nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "pyproject-nix": [
+          "pyproject-nix"
+        ]
+      },
+      "locked": {
+        "lastModified": 1772545244,
+        "narHash": "sha256-Ys+5UMOqp2kRvnSjyBcvGnjOhkIXB88On1ZcAstz1vY=",
+        "owner": "pyproject-nix",
+        "repo": "uv2nix",
+        "rev": "482aba340ded40ef557d331315f227d5eba84ced",
+        "type": "github"
+      },
+      "original": {
+        "owner": "pyproject-nix",
+        "repo": "uv2nix",
         "type": "github"
       }
     }
diff --git a/flake.nix b/flake.nix
index b584524..5607b88 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,44 +1,232 @@
 {
-  description = "Build my CV";
+  description = "Generate a pretty CV from a Markdown File";
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
-    flake-utils.url = "github:numtide/flake-utils";
+
+    pyproject-nix = {
+      url = "github:pyproject-nix/pyproject.nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    uv2nix = {
+      url = "github:pyproject-nix/uv2nix";
+      inputs.pyproject-nix.follows = "pyproject-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    pyproject-build-systems = {
+      url = "github:pyproject-nix/build-system-pkgs";
+      inputs.pyproject-nix.follows = "pyproject-nix";
+      inputs.uv2nix.follows = "uv2nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    git-hooks = {
+      url = "github:cachix/git-hooks.nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
-  outputs = { self, nixpkgs, flake-utils }:
-    flake-utils.lib.eachDefaultSystem (system:
-      let
-        pkgs = nixpkgs.legacyPackages.${system};
-        out_name = "CV_KonstantinFickel_SoftwareEngineer.pdf";
+  outputs =
+    {
+      self,
+      nixpkgs,
+      pyproject-nix,
+      uv2nix,
+      pyproject-build-systems,
+      git-hooks,
+      ...
+    }:
+    let
+      inherit (nixpkgs) lib;
+      forAllSystems = lib.genAttrs lib.systems.flakeExposed;
 
-        cv = pkgs.stdenv.mkDerivation {
-          name = "cv";
-          src = ./.;
-          buildInputs = [pkgs.python312Packages.weasyprint];
-          buildPhase = ''
-            ${pkgs.python312Packages.weasyprint}/bin/weasyprint cv.html ${out_name}
-          '';
-          installPhase =  ''
-            mkdir $out
-            mv ./${out_name} $out
-          '';
-        };
-      in 
-        {
-          packages = {
-            inherit cv;
-            default = cv;
+      workspace = uv2nix.lib.workspace.loadWorkspace { workspaceRoot = ./.; };
+
+      overlay = workspace.mkPyprojectOverlay {
+        sourcePreference = "wheel";
+      };
+
+      editableOverlay = workspace.mkEditablePyprojectOverlay {
+        root = "$REPO_ROOT";
+      };
+
+      pythonSets = forAllSystems (
+        system:
+        let
+          pkgs = nixpkgs.legacyPackages.${system};
+          inherit (pkgs) stdenv;
+
+          baseSet = pkgs.callPackage pyproject-nix.build.packages {
+            python = pkgs.python313;
           };
 
-          devShells = {
-            default = pkgs.mkShell {
-              buildInputs = with pkgs; [
-                python312Packages.weasyprint
+          pyprojectOverrides = _final: prev: {
+            cv = prev.cv.overrideAttrs (old: {
+              passthru = old.passthru // {
+                tests = (old.passthru.tests or { }) // {
+                  pytest = stdenv.mkDerivation {
+                    name = "${_final.cv.name}-pytest";
+                    inherit (_final.cv) src;
+                    nativeBuildInputs = [
+                      (_final.mkVirtualEnv "cv-pytest-env" {
+                        cv = [ "dev" ];
+                      })
+                    ];
+                    dontConfigure = true;
+                    buildPhase = ''
+                      runHook preBuild
+                      # Exit code 5 means no tests collected — allow it so the
+                      # check succeeds on an empty test suite.
+                      pytest || [ $? -eq 5 ]
+                      runHook postBuild
+                    '';
+                    installPhase = ''
+                      runHook preInstall
+                      touch $out
+                      runHook postInstall
+                    '';
+                  };
+                };
+              };
+            });
+          };
+
+        in
+        baseSet.overrideScope (
+          lib.composeManyExtensions [
+            pyproject-build-systems.overlays.default
+            overlay
+            pyprojectOverrides
+          ]
+        )
+      );
+
+      mkGitHooksCheck =
+        system:
+        let
+          pkgs = nixpkgs.legacyPackages.${system};
+          pythonSet = pythonSets.${system};
+          venv = pythonSet.mkVirtualEnv "cv-check-env" workspace.deps.default;
+        in
+        git-hooks.lib.${system}.run {
+          src = ./.;
+          hooks = {
+            basedpyright = {
+              enable = true;
+              entry = "${pkgs.basedpyright}/bin/basedpyright --pythonpath ${venv}/bin/python --project ${
+                pkgs.writeText "pyrightconfig.json" (
+                  builtins.toJSON {
+                    reportMissingTypeStubs = false;
+                    reportUnnecessaryTypeIgnoreComment = false;
+                  }
+                )
+              }";
+              files = "\\.py$";
+              types = [ "file" ];
+            };
+            ruff.enable = true;
+            ruff-format.enable = true;
+            commitizen.enable = true;
+          };
+        };
+
+    in
+    {
+      packages = forAllSystems (
+        system:
+        let
+          pythonSet = pythonSets.${system};
+          pkgs = nixpkgs.legacyPackages.${system};
+          inherit (pkgs.callPackages pyproject-nix.build.util { }) mkApplication;
+
+          weasyprintLibs = pkgs.lib.makeLibraryPath [
+            pkgs.glib
+            pkgs.pango
+            pkgs.harfbuzz
+            pkgs.fontconfig
+            pkgs.gdk-pixbuf
+          ];
+
+          unwrapped = mkApplication {
+            venv = pythonSet.mkVirtualEnv "cv-env" workspace.deps.default;
+            package = pythonSet.cv;
+          };
+        in
+        rec {
+          cv =
+            pkgs.runCommand "cv-${unwrapped.version or "0.1.0"}"
+              {
+                nativeBuildInputs = [ pkgs.makeWrapper ];
+                meta = unwrapped.meta or { };
+              }
+              ''
+                mkdir -p $out/bin
+                for bin in ${unwrapped}/bin/*; do
+                  makeWrapper "$bin" "$out/bin/$(basename "$bin")" \
+                    --prefix LD_LIBRARY_PATH : "${weasyprintLibs}"
+                done
+              '';
+          default = cv;
+        }
+      );
+
+      checks = forAllSystems (
+        system:
+        let
+          pythonSet = pythonSets.${system};
+        in
+        {
+          inherit (pythonSet.cv.passthru.tests) pytest;
+          pre-commit = mkGitHooksCheck system;
+        }
+      );
+
+      devShells = forAllSystems (
+        system:
+        let
+          pkgs = nixpkgs.legacyPackages.${system};
+          editablePyprojectOverrides = _final: prev: {
+            cv = prev.cv.overrideAttrs (old: {
+              nativeBuildInputs = (old.nativeBuildInputs or [ ]) ++ [
+                _final.editables
+              ];
+            });
+          };
+          pythonSet = pythonSets.${system}.overrideScope (
+            lib.composeManyExtensions [
+              editableOverlay
+              editablePyprojectOverrides
+            ]
+          );
+          virtualenv = pythonSet.mkVirtualEnv "cv-dev-env" workspace.deps.all;
+        in
+        {
+          default = pkgs.mkShell {
+            packages = [
+              virtualenv
+              pkgs.uv
+            ];
+            env = {
+              UV_NO_SYNC = "1";
+              UV_PYTHON = pythonSet.python.interpreter;
+              UV_PYTHON_DOWNLOADS = "never";
+              LD_LIBRARY_PATH = lib.makeLibraryPath [
+                pkgs.glib
+                pkgs.pango
+                pkgs.harfbuzz
+                pkgs.fontconfig
+                pkgs.gdk-pixbuf
               ];
             };
+            shellHook = ''
+              unset PYTHONPATH
+              export REPO_ROOT=$(git rev-parse --show-toplevel)
+              ${(mkGitHooksCheck system).shellHook}
+            '';
           };
         }
-    );
+      );
+    };
 }
-
diff --git a/main.py b/main.py
index a208c90..e03d47c 100644
--- a/main.py
+++ b/main.py
@@ -2,7 +2,7 @@ from pathlib import Path
 
 import typer
 
-from src.cv_generator.generator import generate_pdf
+from cv_generator.generator import generate_pdf
 
 app = typer.Typer()
 
diff --git a/pyproject.toml b/pyproject.toml
index 7b89b2a..c581394 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,6 @@ readme = "README.md"
 license = "MIT"
 requires-python = ">=3.13"
 dependencies = [
-    "basedpyright>=1.38.2",
     "jinja2>=3.1.6",
     "markdown>=3.7",
     "pydantic>=2.12.5",
@@ -15,6 +14,13 @@ dependencies = [
     "weasyprint>=68.1",
 ]
 
+[dependency-groups]
+dev = [
+    "basedpyright>=1.38.2",
+    "pytest>=9.0.2",
+    "ruff>=0.15.1",
+]
+
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"
@@ -22,5 +28,8 @@ build-backend = "hatchling.build"
 [tool.hatch.build.targets.wheel]
 packages = ["main.py", "src/cv_generator"]
 
+[tool.hatch.build.targets.wheel.sources]
+"src" = ""
+
 [project.scripts]
 cv = "main:app"
diff --git a/uv.lock b/uv.lock
index 6649ece..4aafa5d 100644
--- a/uv.lock
+++ b/uv.lock
@@ -165,7 +165,6 @@ name = "cv"
 version = "0.1.0"
 source = { editable = "." }
 dependencies = [
-    { name = "basedpyright" },
     { name = "jinja2" },
     { name = "markdown" },
     { name = "pydantic" },
@@ -174,9 +173,15 @@ dependencies = [
     { name = "weasyprint" },
 ]
 
+[package.dev-dependencies]
+dev = [
+    { name = "basedpyright" },
+    { name = "pytest" },
+    { name = "ruff" },
+]
+
 [package.metadata]
 requires-dist = [
-    { name = "basedpyright", specifier = ">=1.38.2" },
     { name = "jinja2", specifier = ">=3.1.6" },
     { name = "markdown", specifier = ">=3.7" },
     { name = "pydantic", specifier = ">=2.12.5" },
@@ -185,6 +190,13 @@ requires-dist = [
     { name = "weasyprint", specifier = ">=68.1" },
 ]
 
+[package.metadata.requires-dev]
+dev = [
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