diff --git a/deployer/group_vars/all/vars.yml b/deployer/group_vars/all/vars.yml
index 07656e5..1036bc6 100644
--- a/deployer/group_vars/all/vars.yml
+++ b/deployer/group_vars/all/vars.yml
@@ -12,6 +12,8 @@ wordpress:
   checksum: sha1:d5f1e6d7cadd72c11d086a2e1ede0a72f23d993e
 gitea:
   version: 1.11.4
+synapse:
+  version: v1.13.0-py3
 
 sites:
   # - slug: rdb # Shorthand name to use as directory/file name
@@ -126,3 +128,25 @@ sites:
     mysql_database: gitea
     mysql_username: gitea
     mysql_password: "{{ vault_gitea_mysql_password }}"
+
+  - slug: synapse_test # Shorthand name to use as directory/file name
+    # The site URL (without www)
+    url: test.zinz.dev
+    # What kind of site is that?
+    type: synapse
+    # Subnet addresses
+    subnet_cidr_address: 172.27.7.0/24
+    subnet_gateway_ip: 172.27.7.1
+    subnet_site_ip: 172.27.7.2
+    # PostgreSQL
+    psql_database: synapse_test
+    psql_username: synapse_test
+    psql_password: "{{ vault_synapse_test_psql_password }}"
+    # SMTP
+    contact_email: contact@zinz.dev 
+    smtp_host: mail.gandi.net
+    smtp_port: 465 # Clear: 25, SSL: 465, STARTTLS: 587
+    smtp_username: contact@zinz.dev 
+    smtp_password: "{{ vault_synapse_test_smtp_password }}"
+    # Secrets
+    registration_shared_secret: "{{ vault_synapse_test_registration_shared_secret }}"
diff --git a/deployer/group_vars/all/vault.yml b/deployer/group_vars/all/vault.yml
index a2cc694..24e1f87 100644
--- a/deployer/group_vars/all/vault.yml
+++ b/deployer/group_vars/all/vault.yml
@@ -1,41 +1,54 @@
 $ANSIBLE_VAULT;1.1;AES256
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diff --git a/deployer/roles/build/tasks/main.yml b/deployer/roles/build/tasks/main.yml
index 8116df5..057339c 100644
--- a/deployer/roles/build/tasks/main.yml
+++ b/deployer/roles/build/tasks/main.yml
@@ -24,10 +24,10 @@
   when: site.type == "gitea"
   tags: gitea
 
-# build an image
-  # do the msmtp bullshit
-# docker compose
-# nginx
-# let's encrypt
-
-# in another role: deploy the stuff
\ No newline at end of file
+- name: Build Synapse sites
+  include_tasks: synapse.yml  
+  loop: "{{ sites }}"
+  loop_control:
+    loop_var: site
+  when: site.type == "synapse"
+  tags: synapse
diff --git a/deployer/roles/build/tasks/synapse.yml b/deployer/roles/build/tasks/synapse.yml
new file mode 100644
index 0000000..1a1391d
--- /dev/null
+++ b/deployer/roles/build/tasks/synapse.yml
@@ -0,0 +1,12 @@
+---
+- name: "Set site_data_path to {{ www_path }}/{{ site.slug }}"
+  set_fact: site_data_path="{{ www_path }}/{{ site.slug }}"
+  tags: always
+
+####################
+# Render templates #
+####################
+
+- name: "Render templates"
+  import_tasks: render.yml
+  tags: render
\ No newline at end of file
diff --git a/deployer/roles/build/templates/synapse/docker-compose.yml.j2 b/deployer/roles/build/templates/synapse/docker-compose.yml.j2
new file mode 100644
index 0000000..6479993
--- /dev/null
+++ b/deployer/roles/build/templates/synapse/docker-compose.yml.j2
@@ -0,0 +1,40 @@
+version: '3'
+
+# Generated by ansible for site {{ site.url }} 
+# On network {{ site.subnet_cidr_address }}:
+# - site (synapse) at {{ site.subnet_site_ip }}
+
+services:
+  site:
+    # build: site
+    image: matrixdotorg/synapse:{{ gitea.version }}
+    restart: always
+    environment:
+      APP_NAME: "Gitea: git with a cup of coffee"
+      DOMAIN: "{{ site.url }}"
+      SSH_DOMAIN: "{{ site.url }}"
+      ROOL_URL: "https://{{ site.url }}/"
+      USER_UID: "{{ site.user_uid }}"
+      USER_GID: "{{ site.user_gid }}"
+      DB_TYPE: mysql
+      DB_HOST: "{{ site.subnet_gateway_ip }}"
+      DB_USER: "{{ site.mysql_username }}"
+      DB_PASSWD: "{{ site.mysql_password }}"
+      DB_NAME: "{{ site.mysql_database }}"
+    volumes: 
+      - "{{ site_data_path }}:/data"
+      - "/home/git/.ssh:/data/git/.ssh"
+      - "/etc/timezone:/etc/timezone:ro"
+      - "/etc/localtime:/etc/localtime:ro"
+    networks:
+      net:
+        ipv4_address: "{{ site.subnet_site_ip }}"
+    ports:
+      - "127.0.0.1:2222:22" # SSH Passthrough
+
+networks:
+  net:
+    ipam:
+      driver: default
+      config:
+        - subnet: "{{ site.subnet_cidr_address }}"
diff --git a/deployer/roles/build/templates/synapse/nginx.host.j2 b/deployer/roles/build/templates/synapse/nginx.host.j2
new file mode 100644
index 0000000..f73b3d7
--- /dev/null
+++ b/deployer/roles/build/templates/synapse/nginx.host.j2
@@ -0,0 +1,55 @@
+# Generated by ansible for site {{ site.url }} 
+# At {{ site.subnet_site_ip }} on {{ site.subnet_cidr_address }}
+
+server {
+  listen 80;
+  listen [::]:80;
+  server_name {{ site.url }} www.{{ site.url }};
+
+  # Let's Encrypt
+  include snippets/letsencrypt.conf;
+
+  location / {
+{# Does this work as intended when redirect_to_ww is undefined? #}
+{% if site.redirect_to_www %}
+    return 301 https://www.{{ site.url }}$request_uri;
+{% else %}
+    return 301 https://{{ site.url }}$request_uri;
+{% endif %}
+  }
+}
+
+server {
+  listen 443 ssl;
+  listen [::]:443 ssl;
+  server_name {{ site.url }} www.{{ site.url }};
+
+  access_log  /var/log/nginx/{{ site.slug }}-access.log;
+  error_log   /var/log/nginx/{{ site.slug }}-error.log;
+
+{% if site.redirect_to_www %}
+  # Redirect non-www to www
+  if ($host = {{ site.url }}) {
+    rewrite ^ https://www.{{ site.url }}$request_uri permanent;
+  }
+{% else %}
+  # Redirect www to non-www
+  if ($host = www.{{ site.url }}) {
+    rewrite ^ https://{{ site.url }}$request_uri permanent;
+  }
+{% endif %}
+
+  # Let's Encrypt
+  include snippets/letsencrypt.conf;
+
+  include snippets/ssl-params.conf;
+  ssl_certificate /etc/letsencrypt/live/{{ site.url }}/fullchain.pem;
+  ssl_certificate_key /etc/letsencrypt/live/{{ site.url }}/privkey.pem;
+  
+  include snippets/header-params_server.conf;
+  location / {
+    include snippets/header-params_location.conf;
+  
+    proxy_pass http://{{ site.subnet_site_ip }}:3000;
+  }
+}