diff --git a/app/assets/javascripts/discourse/app/models/post-stream.js b/app/assets/javascripts/discourse/app/models/post-stream.js
index 6315fd1e88c..a30e1f51afc 100644
--- a/app/assets/javascripts/discourse/app/models/post-stream.js
+++ b/app/assets/javascripts/discourse/app/models/post-stream.js
@@ -1152,6 +1152,10 @@ export default class PostStream extends RestModel {
       headers,
     }).then((result) => {
       this._setSuggestedTopics(result);
+      if (result.user_badges) {
+        this.topic.user_badges ??= {};
+        Object.assign(this.topic.user_badges, result.user_badges);
+      }
 
       const posts = get(result, "post_stream.posts");
 
diff --git a/app/assets/javascripts/discourse/app/models/post.js b/app/assets/javascripts/discourse/app/models/post.js
index 51c2470e041..96737deaeda 100644
--- a/app/assets/javascripts/discourse/app/models/post.js
+++ b/app/assets/javascripts/discourse/app/models/post.js
@@ -478,4 +478,14 @@ export default class Post extends RestModel {
   get topicNotificationLevel() {
     return this.topic.details.notification_level;
   }
+
+  get userBadges() {
+    if (!this.topic?.user_badges) {
+      return;
+    }
+    const badgeIds = this.topic.user_badges.users[this.user_id]?.badge_ids;
+    if (badgeIds) {
+      return badgeIds.map((badgeId) => this.topic.user_badges.badges[badgeId]);
+    }
+  }
 }
diff --git a/app/models/remote_theme.rb b/app/models/remote_theme.rb
index 8b8452fd3d8..7179934f7b6 100644
--- a/app/models/remote_theme.rb
+++ b/app/models/remote_theme.rb
@@ -297,10 +297,12 @@ class RemoteTheme < ActiveRecord::Base
     end
 
     ThemeModifierSet.modifiers.keys.each do |modifier_name|
-      theme.theme_modifier_set.public_send(
-        :"#{modifier_name}=",
-        theme_info.dig("modifiers", modifier_name.to_s),
-      )
+      value = theme_info.dig("modifiers", modifier_name.to_s)
+      if Hash === value && value["type"] == "setting"
+        theme.theme_modifier_set.add_theme_setting_modifier(modifier_name, value["value"])
+      else
+        theme.theme_modifier_set.public_send(:"#{modifier_name}=", value)
+      end
     end
 
     if !theme.theme_modifier_set.valid?
@@ -383,6 +385,8 @@ class RemoteTheme < ActiveRecord::Base
       self.transaction(&transaction_block)
     end
 
+    theme.theme_modifier_set.save! if theme.theme_modifier_set.refresh_theme_setting_modifiers
+
     self
   ensure
     begin
diff --git a/app/models/theme.rb b/app/models/theme.rb
index fbfb36c7eb8..dd0b032fbe9 100644
--- a/app/models/theme.rb
+++ b/app/models/theme.rb
@@ -756,9 +756,7 @@ class Theme < ActiveRecord::Base
   def update_setting(setting_name, new_value)
     target_setting = settings[setting_name.to_sym]
     raise Discourse::NotFound unless target_setting
-
     target_setting.value = new_value
-
     self.theme_setting_requests_refresh = true if target_setting.requests_refresh?
   end
 
diff --git a/app/models/theme_modifier_set.rb b/app/models/theme_modifier_set.rb
index f7fe5a5a5b7..89eda882595 100644
--- a/app/models/theme_modifier_set.rb
+++ b/app/models/theme_modifier_set.rb
@@ -47,7 +47,7 @@ class ThemeModifierSet < ActiveRecord::Base
     when :string_array
       all_values.flatten(1)
     else
-      raise ThemeModifierSetError "Invalid theme modifier combine_mode"
+      raise ThemeModifierSetError, "Invalid theme modifier combine_mode"
     end
   end
 
@@ -75,14 +75,49 @@ class ThemeModifierSet < ActiveRecord::Base
     super(val.map { |dim| "#{dim[0]}x#{dim[1]}" })
   end
 
+  def add_theme_setting_modifier(modifier_name, setting_name)
+    self.theme_setting_modifiers ||= {}
+    self.theme_setting_modifiers[modifier_name] = setting_name
+  end
+
+  def refresh_theme_setting_modifiers(target_setting_name: nil, target_setting_value: nil)
+    changed = false
+    if self.theme_setting_modifiers.present?
+      self.theme_setting_modifiers.each do |modifier_name, setting_name|
+        modifier_name = modifier_name.to_sym
+        setting_name = setting_name.to_sym
+
+        next if target_setting_name.present? && target_setting_name.to_sym != setting_name
+
+        value =
+          target_setting_name.present? ? target_setting_value : theme.settings[setting_name]&.value
+        value = coerce_setting_value(modifier_name, value)
+        if read_attribute(modifier_name) != value
+          write_attribute(modifier_name, value)
+          changed = true
+        end
+      end
+    end
+    changed
+  end
+
   private
 
+  def coerce_setting_value(modifier_name, value)
+    type = ThemeModifierSet.modifiers.dig(modifier_name, :type)
+    if type == :boolean
+      value.to_s != "false"
+    elsif type == :string_array
+      value.is_a?(Array) ? value : value.to_s.split("|")
+    end
+  end
+
   # Build the list of modifiers from the DB schema.
   # This allows plugins to introduce new modifiers by adding columns to the table
   def self.load_modifiers
     hash = {}
     columns_hash.each do |column_name, info|
-      next if %w[id theme_id].include?(column_name)
+      next if %w[id theme_id theme_setting_modifiers].include?(column_name)
 
       type = nil
       if info.type == :string && info.array?
@@ -105,13 +140,15 @@ end
 #
 # Table name: theme_modifier_sets
 #
-#  id                       :bigint           not null, primary key
-#  theme_id                 :bigint           not null
-#  serialize_topic_excerpts :boolean
-#  csp_extensions           :string           is an Array
-#  svg_icons                :string           is an Array
-#  topic_thumbnail_sizes    :string           is an Array
-#  custom_homepage          :boolean
+#  id                         :bigint           not null, primary key
+#  theme_id                   :bigint           not null
+#  serialize_topic_excerpts   :boolean
+#  csp_extensions             :string           is an Array
+#  svg_icons                  :string           is an Array
+#  topic_thumbnail_sizes      :string           is an Array
+#  custom_homepage            :boolean
+#  serialize_post_user_badges :string           is an Array
+#  theme_setting_modifiers    :jsonb
 #
 # Indexes
 #
diff --git a/app/models/theme_setting.rb b/app/models/theme_setting.rb
index 58221b548d9..cabfbc54f89 100644
--- a/app/models/theme_setting.rb
+++ b/app/models/theme_setting.rb
@@ -22,6 +22,13 @@ class ThemeSetting < ActiveRecord::Base
     if self.data_type == ThemeSetting.types[:upload] && saved_change_to_value?
       UploadReference.ensure_exist!(upload_ids: [self.value], target: self)
     end
+
+    if theme.theme_modifier_set.refresh_theme_setting_modifiers(
+         target_setting_name: self.name,
+         target_setting_value: self.value,
+       )
+      theme.theme_modifier_set.save!
+    end
   end
 
   def clear_settings_cache
diff --git a/app/serializers/post_stream_serializer_mixin.rb b/app/serializers/post_stream_serializer_mixin.rb
index e3e8612aab5..e3cb95554ee 100644
--- a/app/serializers/post_stream_serializer_mixin.rb
+++ b/app/serializers/post_stream_serializer_mixin.rb
@@ -4,6 +4,7 @@ module PostStreamSerializerMixin
   def self.included(klass)
     klass.attributes :post_stream
     klass.attributes :timeline_lookup
+    klass.attributes :user_badges
   end
 
   def include_stream?
@@ -14,6 +15,18 @@ module PostStreamSerializerMixin
     true
   end
 
+  def include_user_badges?
+    badges_to_include.present?
+  end
+
+  def user_badges
+    object.user_badges(badges_to_include)
+  end
+
+  def badges_to_include
+    @badges_to_include ||= theme_modifier_helper.serialize_post_user_badges
+  end
+
   def post_stream
     result = { posts: posts }
 
@@ -55,4 +68,8 @@ module PostStreamSerializerMixin
         end
       end
   end
+
+  def theme_modifier_helper
+    @theme_modifier_helper ||= ThemeModifierHelper.new(request: scope.request)
+  end
 end
diff --git a/db/migrate/20241011033602_add_post_badges_to_theme_modifiers.rb b/db/migrate/20241011033602_add_post_badges_to_theme_modifiers.rb
new file mode 100644
index 00000000000..fd54996385d
--- /dev/null
+++ b/db/migrate/20241011033602_add_post_badges_to_theme_modifiers.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+class AddPostBadgesToThemeModifiers < ActiveRecord::Migration[7.1]
+  def change
+    add_column :theme_modifier_sets, :serialize_post_user_badges, :string, array: true
+    add_column :theme_modifier_sets, :theme_setting_modifiers, :jsonb
+  end
+end
diff --git a/lib/topic_view.rb b/lib/topic_view.rb
index d89612d12c7..16aed2f74f7 100644
--- a/lib/topic_view.rb
+++ b/lib/topic_view.rb
@@ -155,6 +155,56 @@ class TopicView
     @personal_message = @topic.private_message?
   end
 
+  def user_badges(badge_names)
+    return if !badge_names.present?
+
+    user_ids = Set.new
+    posts.each { |post| user_ids << post.user_id if post.user_id }
+
+    return if !user_ids.present?
+
+    badges =
+      Badge.where("LOWER(name) IN (?)", badge_names.map(&:downcase)).where(enabled: true).to_a
+
+    sql = <<~SQL
+     SELECT user_id, badge_id
+     FROM user_badges
+     WHERE user_id IN (:user_ids) AND badge_id IN (:badge_ids)
+     GROUP BY user_id, badge_id
+     ORDER BY user_id, badge_id
+   SQL
+
+    user_badges = DB.query(sql, user_ids: user_ids, badge_ids: badges.map(&:id))
+
+    user_badge_mapping = {}
+    user_badges.each do |user_badge|
+      user_badge_mapping[user_badge.user_id] ||= []
+      user_badge_mapping[user_badge.user_id] << user_badge.badge_id
+    end
+
+    indexed_badges = {}
+
+    badges.each do |badge|
+      indexed_badges[badge.id] = {
+        id: badge.id,
+        name: badge.name,
+        slug: badge.slug,
+        description: badge.description,
+        icon: badge.icon,
+        image_url: badge.image_url,
+        badge_grouping_id: badge.badge_grouping_id,
+        badge_type_id: badge.badge_type_id,
+      }
+    end
+
+    user_badge_mapping =
+      user_badge_mapping
+        .map { |user_id, badge_ids| [user_id, { id: user_id, badge_ids: badge_ids }] }
+        .to_h
+
+    { users: user_badge_mapping, badges: indexed_badges }
+  end
+
   def show_read_indicator?
     return false if !@user || !topic.private_message?
 
diff --git a/spec/models/remote_theme_spec.rb b/spec/models/remote_theme_spec.rb
index a4d70b1ca87..51f1396d761 100644
--- a/spec/models/remote_theme_spec.rb
+++ b/spec/models/remote_theme_spec.rb
@@ -25,7 +25,15 @@ RSpec.describe RemoteTheme do
             }
           },
           "modifiers": {
-            "serialize_topic_excerpts": true
+            "serialize_topic_excerpts": true,
+            "custom_homepage": {
+              "type": "setting",
+              "value": "boolean_setting"
+            },
+            "serialize_post_user_badges": {
+              "type": "setting",
+              "value": "list_setting"
+            }
           }
         }
       JSON
@@ -42,6 +50,12 @@ RSpec.describe RemoteTheme do
       JS
 
     let :initial_repo do
+      settings = <<~YAML
+        boolean_setting: true
+        list_setting:
+          type: list
+          default: ""
+      YAML
       setup_git_repo(
         "about.json" => about_json,
         "desktop/desktop.scss" => scss_data,
@@ -55,7 +69,7 @@ RSpec.describe RemoteTheme do
         "common/embedded.scss" => "EMBED",
         "common/color_definitions.scss" => ":root{--color-var: red}",
         "assets/font.woff2" => "FAKE FONT",
-        "settings.yaml" => "boolean_setting: true",
+        "settings.yaml" => settings,
         "locales/en.yml" => "sometranslations",
         "migrations/settings/0001-some-migration.js" => migration_js,
       )
@@ -175,6 +189,7 @@ RSpec.describe RemoteTheme do
       expect(remote.minimum_discourse_version).to eq("1.0.0")
 
       expect(theme.theme_modifier_set.serialize_topic_excerpts).to eq(true)
+      expect(theme.theme_modifier_set.custom_homepage).to eq(true)
 
       expect(theme.theme_fields.length).to eq(12)
 
@@ -187,7 +202,9 @@ RSpec.describe RemoteTheme do
 
       expect(mapped["0-font"]).to eq("")
 
-      expect(mapped["3-yaml"]).to eq("boolean_setting: true")
+      expect(mapped["3-yaml"]).to eq(
+        "boolean_setting: true\nlist_setting:\n  type: list\n  default: \"\"\n",
+      )
 
       expect(mapped["4-en"]).to eq("sometranslations")
       expect(mapped["7-acceptance/theme-test.js"]).to eq("assert.ok(true);")
@@ -197,9 +214,18 @@ RSpec.describe RemoteTheme do
 
       expect(mapped.length).to eq(12)
 
-      expect(theme.settings.length).to eq(1)
+      expect(theme.settings.length).to eq(2)
       expect(theme.settings[:boolean_setting].value).to eq(true)
+      expect(theme.settings[:list_setting].value).to eq("")
 
+      # lets change the setting to see modifier reflects
+      theme.update_setting(:boolean_setting, false)
+      theme.update_setting(:list_setting, "badge1|badge2")
+      theme.save!
+      theme.reload
+
+      expect(theme.theme_modifier_set.custom_homepage).to eq(false)
+      expect(theme.theme_modifier_set.serialize_post_user_badges).to eq(%w[badge1 badge2])
       expect(remote.remote_updated_at).to eq_time(time)
 
       scheme = ColorScheme.find_by(theme_id: theme.id)
diff --git a/spec/requests/topics_controller_spec.rb b/spec/requests/topics_controller_spec.rb
index 6470eec2868..c36cff13727 100644
--- a/spec/requests/topics_controller_spec.rb
+++ b/spec/requests/topics_controller_spec.rb
@@ -2455,6 +2455,53 @@ RSpec.describe TopicsController do
       expect(user_options_queries.size).to eq(1) # for all mentioned users
     end
 
+    context "with serialize_post_user_badges" do
+      fab!(:badge)
+      before do
+        theme = Fabricate(:theme)
+        theme.theme_modifier_set.update!(serialize_post_user_badges: [badge.name])
+        SiteSetting.default_theme_id = theme.id
+      end
+
+      it "correctly returns user badges that are registered" do
+        first_post = topic.posts.order(:post_number).first
+        first_post.user.user_badges.create!(
+          badge_id: badge.id,
+          granted_at: Time.zone.now,
+          granted_by: Discourse.system_user,
+        )
+
+        expected_payload = {
+          "users" => {
+            first_post.user_id.to_s => {
+              "id" => first_post.user.id,
+              "badge_ids" => [badge.id],
+            },
+          },
+          "badges" => {
+            badge.id.to_s => {
+              "id" => badge.id,
+              "name" => badge.name,
+              "slug" => badge.slug,
+              "description" => badge.description,
+              "icon" => badge.icon,
+              "image_url" => badge.image_url,
+              "badge_grouping_id" => badge.badge_grouping_id,
+              "badge_type_id" => badge.badge_type_id,
+            },
+          },
+        }
+
+        get "/t/#{topic.slug}/#{topic.id}.json"
+        user_badges = response.parsed_body["user_badges"]
+        expect(user_badges).to eq(expected_payload)
+
+        get "/t/#{topic.id}/posts.json?post_ids[]=#{first_post.id}"
+        user_badges = response.parsed_body["user_badges"]
+        expect(user_badges).to eq(expected_payload)
+      end
+    end
+
     context "with registered redirect_to_correct_topic_additional_query_parameters" do
       let(:modifier_block) { Proc.new { |allowed_params| allowed_params << :silly_param } }