diff --git a/parsons/configuration.nix b/parsons/configuration.nix
index e7db340..1d047ca 100644
--- a/parsons/configuration.nix
+++ b/parsons/configuration.nix
@@ -20,6 +20,7 @@
     ./uffd.nix
     ./lxc.nix
     ./monit.nix
+    ./s4f-conference.nix
   ];
 
   hacc.bindToPersist = [ "/var/lib/acme" ];
diff --git a/parsons/s4f-conference.nix b/parsons/s4f-conference.nix
new file mode 100644
index 0000000..2d95021
--- /dev/null
+++ b/parsons/s4f-conference.nix
@@ -0,0 +1,134 @@
+{ config, lib, pkgs, ... }:
+
+{
+  sops.secrets = {
+    "s4f-conference/env" = {};
+  };
+
+  hacc.containers.s4f-conference = {
+    bindSecrets = true;
+
+    config = { config, lib, pkgs, ... }: {
+      systemd.services.mattermost.serviceConfig.EnvironmentFile =
+        lib.mkForce "/secrets/env";
+
+      services.mattermost = {
+        enable = true;
+        siteUrl = "https://s4f-conference.infra4future.de";
+        siteName = "Scientists for Future Chat";
+        listenAddress = "0.0.0.0:3000";
+        mutableConfig = false;
+
+        statePath = "/persist/mattermost";
+
+        extraConfig = {
+          ServiceSettings = {
+            TrustedProxyIPHeader = [ "X-Forwarded-For" "X-Real-Ip" ];
+            EnableEmailInvitations = true;
+          };
+          TeamSettings = {
+            EnableUserCreation = true;
+            EnableUserDeactivation = true;
+            EnableOpenServer = false;
+          };
+          PasswordSettings = {
+            MinimumLength = 10;
+          };
+          FileSettings = {
+            EnableFileAttachments = true;
+            MaxFileSize = 52428800;
+            DriverName = "local";
+            Directory = "/persist/upload-storage";
+            EnablePublicLink = true;
+            PublicLinkSalt = "3k7p3yxdhz6798b3b9openfr9rn3ymwu";
+          };
+          EmailSettings = {
+            EnableSignUpWithEmail = true;
+            EnableSignInWithEmail = true;
+            EnableSignInWithUsername = true;
+            SendEmailNotifications = true;
+            FeedbackName = "mattermost";
+            FeedbackEmail = "mattermost@infra4future.de";
+            ReplyToAddress = "mattermost@infra4future.de";
+            FeedbackOrganization = "∆infra4future.de";
+            EnableSMTPAuth = true;
+            SMTPUsername = "noreply@infra4future.de";
+            SMTPServer = "mail.hacc.space";
+            SMTPPort = "465";
+            SMTPServerTimeout = 10;
+            ConnectionSecurity = "TLS";
+          };
+          RateLimitSettings.Enable = false;
+          PrivacySettings = {
+            ShowEmailAddress = false;
+            ShowFullName = true;
+          };
+          # to disable the extra landing page advertising the app
+          NativeAppSettings = {
+            AppDownloadLink = "";
+            AndroidAppDownloadLink = "";
+            IosAppDownloadLink = "";
+          };
+          LogSettings = {
+            EnableConsole = true;
+            ConsoleLevel = "ERROR";
+            EnableDiagnostics = false;
+            EnableWebhookDebugging = false;
+          };
+          SupportSettings = {
+            TermsOfServiceLink = "https://infra4future.de/nutzungsbedingungen.html";
+            PrivacyPolicyLink = "https://infra4future.de/nutzungsbedingungen.html";
+            AboutLink = "https://infra4future.de";
+            SupportEmail = "info@infra4future.de";
+            CustomTermsOfServiceEnabled = false;
+            EnableAskCommunityLink = true;
+          };
+          AnnouncementSettings.EnableBanner = false;
+          ComplianceSettings.Enable = false;
+          ClusterSettings.Enable = false;
+          MetricsSettings.Enable = false;
+          GuestAccountsSettings.Enable = true;
+        };
+
+        localDatabaseCreate = false;
+      };
+
+      services.postgresql = {
+        enable = lib.mkForce true; # mattermost sets this to false. wtf.
+        package = pkgs.postgresql_15;
+        ensureDatabases = [ "mattermost" ];
+        ensureUsers = [ {
+          name = "mattermost";
+          ensureDBOwnership = true;
+        } ];
+
+        authentication = lib.mkForce ''
+          # Generated file; do not edit!
+          local all all              trust
+          host  mattermost mattermost ::1/128      trust
+        '';
+      };
+      services.postgresqlBackup = {
+        enable = true;
+        databases = [ "mattermost" ];
+        startAt = "*-*-* 23:45:00";
+        location = "/persist/backups/postgres";
+      };
+    };
+  };
+
+  services.nginx.virtualHosts."s4f-conference.infra4future.de" = {
+    locations."/" = {
+      proxyPass = "http://${config.containers.s4f-conference.localAddress}:3000";
+      proxyWebsockets = true;
+      extraConfig = ''
+        # Mattermost CSR Patch
+        proxy_hide_header Content-Security-Policy;
+        proxy_hide_header X-Frame-Options;
+        proxy_redirect off;
+      '';
+    };
+    forceSSL = true;
+    enableACME = true;
+  };
+}
diff --git a/secrets.yaml b/secrets.yaml
index 6009879..f5234a7 100644
--- a/secrets.yaml
+++ b/secrets.yaml
@@ -11,6 +11,8 @@ auamost:
 restic:
     s3creds.env: ENC[AES256_GCM,data:9WNu5S4KmdMXdshSpawEjIexAKH6vZCPwb9xyq6xmerly1lxSfFZzgg60M0L3L+I4joLTVi23YBB8Eh6Xfx9GgxNww7w7BjMCQs/X16ecDWlb346TKf+,iv:Gu4CbXXJAlQYXRqOjIAUYmn8EU4mrvcOVc2eCh1Ikzs=,tag:1xpVIonHiAGHsXTY9liPQQ==,type:str]
     system: ENC[AES256_GCM,data:RIgO0QHVjwp2D3LoU62vLzepASdsXxu0DqUTA6Voa3K1d4xFHX2u+UR8AcqR,iv:O0K8i5ivne7WU+ygDEUcrvKW6DIfXjVPY63gpfsxEFE=,tag:n/1atQ5qlyB0SMHrYiTCrA==,type:str]
+s4f-conference:
+    env: ENC[AES256_GCM,data:e4Fuurb37YQvracqLA8Z1VQL5MpiARE35NKCNdLgyxyVNRm6zSATwyH8DvkST8zuYadAv9wOwjv5q9Xlv7CWBFPyMMjkrHPZORJI,iv:36EGmqqIpeNWylinu902MFU3MZf6sPRWvUrSl5usxHI=,tag:XxoTdq10zgr6xtMn4TYDOA==,type:str]
 sops:
     kms: []
     gcp_kms: []
@@ -98,8 +100,8 @@ sops:
             bndBTXJhQVE2OVlKeGNTbzJlL0duUzAKIWdesesYvBIN/m36fhzxq30+IT8qp/pF
             S6i7QqZF75y2BpEoupRCqNIAsHrouUE+U9ZQJZO8m9J591mWvbVJIw==
             -----END AGE ENCRYPTED FILE-----
-    lastmodified: "2024-05-01T01:20:25Z"
-    mac: ENC[AES256_GCM,data:2fVIskFTMl1jefsa3A9fbBBUBK3Ni9XpUjLbwgewEUEKDhwzHY7vjlauzEVtcFJhYkorG/I/0YkPE6PjHta8Qk4mAOfXeVeLDrwH0dmIoPxw+J4kCgRNgNGdhkvmSUBQKwmhfvG3owZnGvq6JfcKZW8HodXyZ+GQQNknGzoX1wQ=,iv:fIXw7lsLwMHsNpZyv9nil7pdXrYNm18UV87KY0Z2zJ4=,tag:L/zymgljJWopKN1q7rpPhg==,type:str]
+    lastmodified: "2024-05-08T11:06:26Z"
+    mac: ENC[AES256_GCM,data:H18GHY66eYI8BfJNd1ybzTgrPoq+lGnSp1f+65/+cOOndgyzo9/XwgToB3tMMyJFIXbQ0li9zYIb0TMldSYsaXI1AixPqRh8UXwM5x7OBZCi3DFA+SLKhslO88Lw3abZ9IEkZgrnNjeLKKXxgZwPHEpmlkOS38rDYTFCToK5JVI=,iv:TKaay3eFIDGr++8F500n45BISH6LnhWQ1+x18HiXZD8=,tag:Zecr/XH6NfP8tOj4T9Fmqg==,type:str]
     pgp: []
     unencrypted_suffix: _unencrypted
     version: 3.8.1