diff --git a/Gemfile b/Gemfile
index 9334227c..ce0fe1b8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -33,6 +33,7 @@ gem 'skylight', '~> 0.6.0.beta.1'
 gem 'stackprof'
 
 gem 'jemalloc'
+gem 'customerio'
 
 group :test do
   gem 'rspec',         '~> 2.13'
diff --git a/Gemfile.lock b/Gemfile.lock
index 9353a43e..d587bd84 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -50,7 +50,7 @@ GIT
 
 GIT
   remote: git://github.com/travis-ci/travis-core.git
-  revision: 6ce83e05afc07d412195d226b77a896e2b652146
+  revision: 90c2d1b67935f20fd117bc6d9bc02783312e27ba
   specs:
     travis-core (0.0.1)
       actionmailer (~> 3.2.19)
@@ -157,6 +157,9 @@ GEM
     composite_primary_keys (5.0.14)
       activerecord (~> 3.2.0, >= 3.2.9)
     connection_pool (2.1.1)
+    customerio (0.6.1)
+      httparty (>= 0.5, < 0.12)
+      multi_json (~> 1.0)
     dalli (2.7.2)
     data_migrations (0.0.1)
       activerecord
@@ -187,6 +190,9 @@ GEM
     hashr (0.0.22)
     hike (1.2.3)
     hitimes (1.2.3)
+    httparty (0.11.0)
+      multi_json (~> 1.0)
+      multi_xml (>= 0.5.2)
     httpclient (2.7.0.1)
     i18n (0.7.0)
     ice_nine (0.11.1)
@@ -215,6 +221,7 @@ GEM
     mocha (0.14.0)
       metaclass (~> 0.0.1)
     multi_json (1.11.2)
+    multi_xml (0.5.5)
     multipart-post (2.0.0)
     net-http-persistent (2.9.4)
     net-http-pipeline (1.0.1)
@@ -315,7 +322,7 @@ GEM
     treetop (1.4.15)
       polyglot
       polyglot (>= 0.3.1)
-    tzinfo (0.3.45)
+    tzinfo (0.3.46)
     unicorn (4.8.3)
       kgio (~> 2.6)
       rack
@@ -335,6 +342,7 @@ PLATFORMS
 DEPENDENCIES
   active_model_serializers
   bunny (~> 0.8.0)
+  customerio
   dalli
   database_cleaner (~> 0.8.0)
   factory_girl (~> 2.4.0)
@@ -369,3 +377,6 @@ DEPENDENCIES
   travis-yaml!
   unicorn
   yard-sinatra!
+
+BUNDLED WITH
+   1.10.6
diff --git a/lib/travis/api/app/endpoint/authorization.rb b/lib/travis/api/app/endpoint/authorization.rb
index 41b06e75..441032c0 100644
--- a/lib/travis/api/app/endpoint/authorization.rb
+++ b/lib/travis/api/app/endpoint/authorization.rb
@@ -2,6 +2,7 @@ require 'travis/api/app'
 require 'addressable/uri'
 require 'faraday'
 require 'securerandom'
+require 'customerio'
 
 class Travis::Api::App
   class Endpoint
@@ -95,6 +96,7 @@ class Travis::Api::App
       # * **redirect_uri**: URI to redirect to after handshake.
       get '/handshake' do
         handshake do |user, token, redirect_uri|
+
           if target_ok? redirect_uri
             content_type :html
             data = { user: user, token: token, uri: redirect_uri }
@@ -156,6 +158,33 @@ class Travis::Api::App
           halt 403, "you are currently not allowed to perform this request. please contact support@travis-ci.com."
         end
 
+        # update first login date if not set
+        def update_first_login(user)
+          unless user.first_logged_in_at
+            user.update_attributes(first_logged_in_at: Time.now)
+          end
+        end
+
+        def update_customerio(user)
+          return unless Travis.config.customerio.site_id
+
+          # send event to customer.io
+          payload = {
+            :id => user.id,
+            :name => user.name,
+            :login => user.login,
+            :email => primary_email_for_user(user.github_oauth_token),
+            :created_at => user.created_at.to_i,
+            :github_id => user.github_id,
+            :education => user.education,
+            :first_logged_in_at => user.first_logged_in_at.to_i
+          }
+
+          customerio.identify(payload)
+        rescue StandardError => e
+          Travis.logger.error "Could not update Customer.io for User: #{user.id}:#{user.login} with message:#{e.message}"
+        end
+
         def serialize_user(user)
           rendered = Travis::Api.data(user, version: :v2)
           rendered['user'].merge('token' => user.tokens.first.try(:token).to_s)
@@ -185,6 +214,8 @@ class Travis::Api::App
             user                   = user_for_github_token(github_token)
             token                  = generate_token(user: user, app_id: 0)
             payload                = params[:state].split(":::", 2)[1]
+            update_first_login(user)
+            update_customerio(user)
             yield serialize_user(user), token, payload
           else
             values[:state]         = create_state
@@ -194,6 +225,7 @@ class Travis::Api::App
           end
         end
 
+
         def create_state
           state = SecureRandom.urlsafe_base64(16)
           redis.sadd('github:states', state)
@@ -223,6 +255,7 @@ class Travis::Api::App
             super
 
             @user = ::User.find_by_github_id(data['id'])
+
           end
 
           def info(attributes = {})
@@ -353,6 +386,15 @@ class Travis::Api::App
         def allowed_https_targets
           @allowed_https_targets ||= Travis.config.auth.target_origin.to_s.split(',')
         end
+
+        def primary_email_for_user(oauth_token)
+          # check for the users primary email address (we don't store this info)
+          GH.with(token: oauth_token, client_id: nil) { GH['user/emails'] }.select { |e| e['primary'] }.first['email']
+        end
+
+        def customerio
+          Customerio::Client.new(Travis.config.customerio.site_id, Travis.config.customerio.api_key, :json => true)
+        end
     end
   end
 end