diff --git a/README.md b/README.md
index aa64b74..b94a8d9 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+This is a solution for the following ruby test task [roonyx-tech/ruby-test-task](https://github.com/roonyx-tech/ruby-test-task)
+
 # Ruby interview task
 
 ### Overview
diff --git a/app/serializer.rb b/app/serializer.rb
index 258be50..1df55aa 100644
--- a/app/serializer.rb
+++ b/app/serializer.rb
@@ -1,2 +1,40 @@
+# frozen_string_literal: true
+
 class Serializer
+  @@attributes = {}
+
+  class << self
+    def attribute(key, &block)
+      attributes[key] = block_given? ? block : nil
+    end
+
+    def attributes
+      @@attributes[to_s] ||= {}
+    end
+
+    def object
+      @@object
+    end
+  end
+
+  def initialize(object)
+    @@object = object
+  end
+
+  def serialize
+    serialized_data = {}
+
+    attributes.each do |key, value|
+      serialized_data[key] = value ? value.call : object.send(key)
+    end
+    serialized_data
+  end
+
+  def object
+    @@object
+  end
+
+  def attributes
+    @@attributes[self.class.to_s]
+  end
 end