diff --git a/app/concepts/project/operation/create_remix.rb b/app/concepts/project/operation/create_remix.rb
new file mode 100644
index 00000000..298ed876
--- /dev/null
+++ b/app/concepts/project/operation/create_remix.rb
@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+class Project
+  module Operation
+    class CreateRemix
+      require 'operation_response'
+
+      def self.call(params)
+        response = OperationResponse.new
+
+        validate_params(response, params)
+        return response if response.failure?
+
+        remix_project(response, params)
+        response
+      end
+
+      class << self
+        private
+
+        def validate_params(response, params)
+          valid = params[:phrase_id].present? && params[:remix][:user_id].present?
+          response[:error] = 'Invalid parameters' unless valid
+        end
+
+        def remix_project(response, params)
+          original_project = Project.find_by!(identifier: params[:phrase_id])
+
+          response[:project] = original_project.dup.tap do |proj|
+            proj.user_id = params[:remix][:user_id]
+            proj.components = original_project.components.map(&:dup)
+          end
+
+          response[:error] = 'Unable to create project' unless response[:project].save
+          response
+        end
+      end
+    end
+  end
+end
diff --git a/app/controllers/api/projects/phrases_controller.rb b/app/controllers/api/projects/phrases_controller.rb
index 6e1e245f..c855d26a 100644
--- a/app/controllers/api/projects/phrases_controller.rb
+++ b/app/controllers/api/projects/phrases_controller.rb
@@ -21,21 +21,6 @@ def update
         head :ok
       end
 
-      def remix
-        old = Project.find_by!(identifier: params[:phrase_id])
-
-        @project = old.dup
-        @project.identifier = PhraseIdentifier.generate
-
-        old.components.each do |component|
-          @project.components << component.dup
-        end
-
-        @project.save
-
-        render '/api/projects/show', formats: [:json]
-      end
-
       private
 
       def project_params
diff --git a/app/controllers/api/projects/remixes_controller.rb b/app/controllers/api/projects/remixes_controller.rb
new file mode 100644
index 00000000..38a0c530
--- /dev/null
+++ b/app/controllers/api/projects/remixes_controller.rb
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+module Api
+  module Projects
+    class RemixesController < ApiController
+      def create
+        result = Project::Operation::CreateRemix.call(remix_params)
+
+        if result.success?
+          @project = result[:project]
+          render '/api/projects/show', formats: [:json]
+        else
+          render json: { error: result[:error] }, status: :bad_request
+        end
+      end
+
+      private
+
+      def remix_params
+        params.permit(:phrase_id, remix: [:user_id])
+      end
+    end
+  end
+end
diff --git a/config/routes.rb b/config/routes.rb
index 0dfec3ec..3903d801 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -14,7 +14,7 @@
 
     namespace :projects do
       resources :phrases, only: %i[show update] do
-        post 'remix', to: 'phrases#remix'
+        resource :remix, only: %i[create]
       end
     end
   end
diff --git a/docker-compose.yml b/docker-compose.yml
index d0c297e5..6591b4a0 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -18,6 +18,8 @@ services:
       - "3009:3009"
     depends_on:
       - db
+    stdin_open: true
+    tty: true
 
 volumes:
   pg-data:
diff --git a/lib/operation_response.rb b/lib/operation_response.rb
new file mode 100644
index 00000000..024e33f9
--- /dev/null
+++ b/lib/operation_response.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class OperationResponse < Hash
+  def success?
+    return false unless self[:error].nil?
+
+    true
+  end
+
+  def failure?
+    !success?
+  end
+end
diff --git a/spec/concepts/project/operation/create_remix_spec.rb b/spec/concepts/project/operation/create_remix_spec.rb
new file mode 100644
index 00000000..780f9721
--- /dev/null
+++ b/spec/concepts/project/operation/create_remix_spec.rb
@@ -0,0 +1,79 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Project::Operation::CreateRemix, type: :unit do
+  subject(:create_remix) { described_class.call(params) }
+
+  let(:user_id) { 'e0675b6c-dc48-4cd6-8c04-0f7ac05af51a' }
+  let!(:original_project) { create(:project, :with_components) }
+
+  before do
+    mock_phrase_generation
+  end
+
+  describe '.call' do
+    context 'when all params valid' do
+      let(:params) { { phrase_id: original_project.identifier, remix: { user_id: user_id } } }
+
+      it 'returns success' do
+        result = create_remix
+        expect(result.success?).to eq(true)
+      end
+
+      it 'creates new project' do
+        expect { create_remix }.to change(Project, :count).by(1)
+      end
+
+      it 'assigns a new identifer to new project' do
+        result = create_remix
+        remixed_project = result[:project]
+        expect(remixed_project.identifier).not_to eq(original_project.identifier)
+      end
+
+      it 'assigns user_id to new project' do
+        remixed_project = create_remix[:project]
+        expect(remixed_project.user_id).to eq(user_id)
+      end
+
+      it 'duplicates properties on new project' do
+        remixed_project = create_remix[:project]
+
+        remixed_attrs = remixed_project.attributes.symbolize_keys.slice(:name, :project_type)
+        original_attrs = original_project.attributes.symbolize_keys.slice(:name, :project_type)
+        expect(remixed_attrs).to eq(original_attrs)
+      end
+
+      it 'duplicates project components' do
+        remixed_props_array = component_array_props(create_remix[:project].components)
+        original_props_array = component_array_props(original_project.components)
+
+        expect(remixed_props_array).to match_array(original_props_array)
+      end
+    end
+
+    context 'when user_id is not present' do
+      let(:params) { { phrase_id: original_project.identifier, remix: { user_id: '' } } }
+
+      it 'returns failure' do
+        result = create_remix
+        expect(result.failure?).to eq(true)
+      end
+
+      it 'does not create new project' do
+        expect { create_remix }.not_to change(Project, :count)
+      end
+    end
+  end
+
+  def component_array_props(components)
+    components.map do |x|
+      {
+        name: x.name,
+        content: x.content,
+        extension: x.extension,
+        index: x.index
+      }
+    end
+  end
+end
diff --git a/spec/factories/component.rb b/spec/factories/component.rb
new file mode 100644
index 00000000..74c43dba
--- /dev/null
+++ b/spec/factories/component.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :component do
+    name { Faker::Lorem.word }
+    extension { 'py' }
+    content { Faker::Lorem.paragraph(sentence_count: 2) }
+  end
+end
diff --git a/spec/factories/project.rb b/spec/factories/project.rb
index 83361497..7badbdcb 100644
--- a/spec/factories/project.rb
+++ b/spec/factories/project.rb
@@ -2,9 +2,15 @@
 
 FactoryBot.define do
   factory :project do
-    user_id { rand(10**10) }
+    user_id { SecureRandom.uuid }
     name { Faker::Book.title }
     identifier { "#{Faker::Verb.base}-#{Faker::Verb.base}-#{Faker::Verb.base}" }
-    project_type { %w[python html].sample }
+    project_type { 'python' }
+
+    trait :with_components do
+      after(:create) do |object|
+        object.components = FactoryBot.create_list(:component, 2, project: object)
+      end
+    end
   end
 end
diff --git a/spec/lib/operation_response_spec.rb b/spec/lib/operation_response_spec.rb
new file mode 100644
index 00000000..faa9b59c
--- /dev/null
+++ b/spec/lib/operation_response_spec.rb
@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require_relative '../../lib/operation_response'
+
+RSpec.describe OperationResponse do
+  describe '#success?' do
+    context 'when :error not present' do
+      it 'returns true' do
+        response = described_class.new
+        expect(response.success?).to eq(true)
+      end
+    end
+
+    context 'when :error has been set' do
+      it 'returns false' do
+        response = described_class.new
+        response[:error] = 'An error'
+        expect(response.success?).to eq(false)
+      end
+    end
+  end
+
+  describe '#failure?' do
+    context 'when :error not present' do
+      it 'returns false' do
+        response = described_class.new
+        expect(response.failure?).to eq(false)
+      end
+    end
+
+    context 'when :error has been set' do
+      it 'returns true' do
+        response = described_class.new
+        response[:error] = 'An error'
+        expect(response.failure?).to eq(true)
+      end
+    end
+  end
+end
diff --git a/spec/models/component_spec.rb b/spec/models/component_spec.rb
index 48bab3aa..b041ddad 100644
--- a/spec/models/component_spec.rb
+++ b/spec/models/component_spec.rb
@@ -3,5 +3,5 @@
 require 'rails_helper'
 
 RSpec.describe Component, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+  it { is_expected.to belong_to(:project) }
 end
diff --git a/spec/models/word_spec.rb b/spec/models/word_spec.rb
deleted file mode 100644
index c9aba94b..00000000
--- a/spec/models/word_spec.rb
+++ /dev/null
@@ -1,7 +0,0 @@
-# frozen_string_literal: true
-
-require 'rails_helper'
-
-RSpec.describe Word, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
-end
diff --git a/spec/rails_helper.rb b/spec/rails_helper.rb
index 77e66855..c2f7fa72 100644
--- a/spec/rails_helper.rb
+++ b/spec/rails_helper.rb
@@ -13,6 +13,7 @@
 abort('The Rails environment is running in production mode!') if Rails.env.production?
 require 'rspec/rails'
 # Add additional requires below this line. Rails is not loaded until this point!
+
 Dir[Rails.root.join('spec/support/**/*.rb')].each { |f| require f }
 
 # Requires supporting ruby files with custom matchers and macros, etc, in
@@ -69,6 +70,7 @@
   config.filter_rails_from_backtrace!
   # arbitrary gems may also be filtered via:
   # config.filter_gems_from_backtrace("gem name")
+  config.include PhraseIdentifierMock
 end
 
 Shoulda::Matchers.configure do |config|
diff --git a/spec/request/projects/remix_spec.rb b/spec/request/projects/remix_spec.rb
new file mode 100644
index 00000000..2b7805e1
--- /dev/null
+++ b/spec/request/projects/remix_spec.rb
@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe 'Remix requests', type: :request do
+  let!(:original_project) { create(:project) }
+  let(:user_id) { 'e0675b6c-dc48-4cd6-8c04-0f7ac05af51a' }
+
+  describe 'create' do
+    before do
+      mock_phrase_generation
+    end
+
+    it 'returns expected response' do
+      post "/api/projects/phrases/#{original_project.identifier}/remix",
+           params: { remix: { user_id: user_id } }
+
+      expect(response.status).to eq(200)
+    end
+
+    context 'when request is invalid' do
+      it 'returns error response' do
+        post "/api/projects/phrases/#{original_project.identifier}/remix",
+             params: { remix: { user_id: '' } }
+
+        expect(response.status).to eq(400)
+      end
+    end
+  end
+end
diff --git a/spec/support/phrase_identifier_mock.rb b/spec/support/phrase_identifier_mock.rb
new file mode 100644
index 00000000..18b97b00
--- /dev/null
+++ b/spec/support/phrase_identifier_mock.rb
@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+module PhraseIdentifierMock
+  def mock_phrase_generation(phrase = nil)
+    # This could cause problems if tests require multiple phrases to be generated
+    phrase ||= "#{Faker::Verb.base}-#{Faker::Verb.base}-#{Faker::Verb.base}"
+
+    allow(PhraseIdentifier).to receive(:generate).and_return(phrase)
+  end
+end