diff --git a/nixos/machines/hera/configuration.nix b/nixos/machines/hera/configuration.nix
index 6df3b3bc..e26b5b1b 100644
--- a/nixos/machines/hera/configuration.nix
+++ b/nixos/machines/hera/configuration.nix
@@ -19,7 +19,7 @@ in {
     ../../roles/matrix-synapse.nix
     ../../roles/coturn.nix
     ../../roles/go-neb.nix
-    ../../roles/laminar.nix
+    ../../roles/laminar
     ./web.nix
     ./mail.nix
     ./boot.nix
diff --git a/nixos/roles/git.nix b/nixos/roles/git.nix
index 548c11d1..59513a65 100644
--- a/nixos/roles/git.nix
+++ b/nixos/roles/git.nix
@@ -9,7 +9,7 @@ let
   ];
   post-update = pkgs.writeHaskellScript {
     name = "post-update";
-    bins = [ pkgs.git ];
+    bins = [ pkgs.git pkgs.laminar ];
     imports = [
       "System.Environment (lookupEnv)"
       "System.Directory (withCurrentDirectory)"
@@ -26,6 +26,10 @@ let
       whenJust mirrorMay $ \mirror -> do
         say [i|Force pushing all branches to #{mirror}|]
         git "push" "--all" "-f" mirror
+      jobMay <- lookupEnv "GL_OPTION_CI_JOB"
+      whenJust jobMay $ \job -> do
+        say "Queuing job:"
+        laminarc "queue" job
       deployMay <- lookupEnv "GL_OPTION_WEB_DEPLOY"
       whenJust deployMay $ \deploy -> do
         (maybe [] (\x -> ["-A", x]) -> target) <- lookupEnv "GL_OPTION_WEB_DEPLOY_NIX_TARGET"
diff --git a/nixos/roles/laminar.nix b/nixos/roles/laminar.nix
deleted file mode 100644
index 6cbb6ba2..00000000
--- a/nixos/roles/laminar.nix
+++ /dev/null
@@ -1,7 +0,0 @@
-{ pkgs, ... }:
-let
-  laminarPkgs = builtins.fetchGit {
-    url = "https://github.com/maralorn/nixpkgs.git";
-    rev = "e37cd38effca0310cfe4d27583102175b4a456c9";
-  };
-in { systemd.packages = [ laminarPkgs.laminar ]; }
diff --git a/nixos/roles/laminar/default.nix b/nixos/roles/laminar/default.nix
new file mode 100644
index 00000000..45e4266e
--- /dev/null
+++ b/nixos/roles/laminar/default.nix
@@ -0,0 +1,57 @@
+{ pkgs, lib, config, ... }:
+let
+  types = lib.types;
+  stateDir = "/var/lib/laminar";
+  jobsDir = "${stateDir}/cfg/jobs";
+  cfg = config.services.laminar;
+in {
+  options = {
+    services.laminar.jobs = lib.mkOption {
+      type = lib.types.attrsOf lib.types.path;
+      default = { };
+      description = ''
+        CI jobs statically known to laminar.
+        Every attribute will be copied to /var/lib/laminar/cfg/jobs/<name>
+      '';
+    };
+  };
+    imports = [./kassandra.nix ];
+  config = {
+    users = {
+      groups.laminar = { };
+      users.laminar = {
+        group = "laminar";
+        home = stateDir;
+      };
+    };
+    environment.systemPackages = [ pkgs.laminar ];
+    systemd.services.laminar = {
+      enable = true;
+      description = "Laminar continuous integration service";
+      serviceConfig = {
+        WorkingDirectory = stateDir;
+        ExecStart = "${pkgs.laminar}/bin/laminard";
+        DynamicUser = false;
+        User = "laminar";
+        StateDirectory = "laminar";
+      };
+      after = [ "network.target" ];
+      preStart = ''
+        mkdir -p ${jobsDir}
+        ${lib.concatStrings (lib.mapAttrsToList (key: value: ''
+          ln -sf ${value} ${jobsDir}/${key}
+        '') cfg.jobs)}'';
+    };
+    services = {
+      nginx = {
+        virtualHosts = {
+          "ci.maralorn.de" = {
+            forceSSL = true;
+            enableACME = true;
+            locations."/".proxyPass = "http://[::1]:8080";
+          };
+        };
+      };
+    };
+  };
+}
diff --git a/nixos/roles/laminar/kassandra.nix b/nixos/roles/laminar/kassandra.nix
new file mode 100644
index 00000000..a03a0023
--- /dev/null
+++ b/nixos/roles/laminar/kassandra.nix
@@ -0,0 +1,35 @@
+{ pkgs, lib, config, ... }:
+let
+  path = [ pkgs.git pkgs.nix pkgs.gnutar pkgs.gzip pkgs.openssh pkgs.laminar ];
+  setup = ''
+    set -ex
+    export PATH=${lib.makeBinPath path}:$PATH
+  '';
+  target = name: ''
+    ${setup}
+    export HOME=$PWD
+    git clone git@localhost:kassandra2 kassandra
+    nix-build --no-out-link kassandra/release.nix -A ${name}
+  '';
+in {
+  services.laminar.jobs = {
+    "kassandra.run" = pkgs.writeShellScript "kassandra" ''
+      ${setup}
+      laminarc run kassandra-lib &
+      P1=$!
+      laminarc run kassandra-android &
+      P2=$!
+      laminarc run kassandra-app &
+      P3=$!
+      laminarc run kassandra-server &
+      P4=$!
+      wait $P1 $P2 $P3 $P4
+    '';
+    "kassandra-lib.run" = pkgs.writeShellScript "kassandra-lib" (target "lib");
+    "kassandra-app.run" = pkgs.writeShellScript "kassandra-app" (target "app");
+    "kassandra-android.run" =
+      pkgs.writeShellScript "kassandra-android" (target "android");
+    "kassandra-server.run" =
+      pkgs.writeShellScript "kassandra-server" (target "server");
+  };
+}
diff --git a/overlays/10-previews.nix b/overlays/10-previews.nix
index 2c00cb2c..eb9087e3 100644
--- a/overlays/10-previews.nix
+++ b/overlays/10-previews.nix
@@ -1,2 +1,8 @@
 self: super:
-{}
+let
+  laminarPkgs = import (builtins.fetchGit {
+    url = "https://github.com/maralorn/nixpkgs.git";
+    rev = "e37cd38effca0310cfe4d27583102175b4a456c9";
+    ref = "laminar";
+  }) { };
+in { laminar = laminarPkgs.laminar; }