diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0bd9ead
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,10 @@
+/.bundle/
+/.yardoc
+/Gemfile.lock
+/_yardoc/
+/coverage/
+/doc/
+/pkg/
+/spec/reports/
+/tmp/
+dump.rdb
diff --git a/.rspec b/.rspec
new file mode 100644
index 0000000..8c18f1a
--- /dev/null
+++ b/.rspec
@@ -0,0 +1,2 @@
+--format documentation
+--color
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..03ee64f
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,5 @@
+sudo: false
+language: ruby
+rvm:
+  - 2.3.1
+before_install: gem install bundler -v 1.12.5
diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000..c766fd2
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,4 @@
+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in sidekiq-batch.gemspec
+gemspec
diff --git a/Guardfile b/Guardfile
new file mode 100644
index 0000000..ac65cab
--- /dev/null
+++ b/Guardfile
@@ -0,0 +1,4 @@
+guard 'rspec', cmd: 'rspec --color' do
+  watch(%r{^lib/(.+)\.rb$}) { |m| "spec/#{m[1]}_spec.rb" }
+  watch(%r|^spec/(.*)_spec\.rb|)
+end
diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
index 0000000..622384f
--- /dev/null
+++ b/LICENSE.txt
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2016 Breamware
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5324182
--- /dev/null
+++ b/README.md
@@ -0,0 +1,32 @@
+# Sidekiq::Batch
+
+Simple Sidekiq Batch Job implementation.
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+```ruby
+gem 'sidekiq-batch'
+```
+
+And then execute:
+
+    $ bundle
+
+Or install it yourself as:
+
+    $ gem install sidekiq-batch
+
+## Usage
+
+Sidekiq Batch is drop-in replacement for the API from Sidekiq PRO. See https://github.com/mperham/sidekiq/wiki/Batches for usage.
+
+## Contributing
+
+Bug reports and pull requests are welcome on GitHub at https://github.com/breamware/sidekiq-batch.
+
+
+## License
+
+The gem is available as open source under the terms of the [MIT License](http://opensource.org/licenses/MIT).
diff --git a/Rakefile b/Rakefile
new file mode 100644
index 0000000..b7e9ed5
--- /dev/null
+++ b/Rakefile
@@ -0,0 +1,6 @@
+require "bundler/gem_tasks"
+require "rspec/core/rake_task"
+
+RSpec::Core::RakeTask.new(:spec)
+
+task :default => :spec
diff --git a/lib/sidekiq/batch.rb b/lib/sidekiq/batch.rb
new file mode 100644
index 0000000..23c7df5
--- /dev/null
+++ b/lib/sidekiq/batch.rb
@@ -0,0 +1,79 @@
+require 'securerandom'
+require 'sidekiq'
+
+require 'sidekiq/batch/callback'
+require 'sidekiq/batch/middleware'
+require 'sidekiq/batch/status'
+require 'sidekiq/batch/version'
+
+module Sidekiq
+  class Batch
+    class NoBlockGivenError < StandardError; end
+
+    attr_reader :bid, :description, :callback_queue
+
+    def initialize(existing_bid = nil)
+      @bid = existing_bid || SecureRandom.urlsafe_base64(10)
+      Sidekiq.redis { |r| r.set("#{bid}-to_process", 0) }
+    end
+
+    def description=(description)
+      @description = description
+      Sidekiq.redis { |r| r.hset(bid, 'description', description) }
+    end
+
+    def callback_queue=(callback_queue)
+      @callback_queue = callback_queue
+      Sidekiq.redis { |r| r.hset(bid, 'callback_queue', callback_queue) }
+    end
+
+    def on(event, callback, options = {})
+      return unless %w(success complete).include?(event.to_s)
+      Sidekiq.redis do |r|
+        r.hset(bid, "callback_#{event}", callback)
+        r.hset(bid, "callback_#{event}_opts", options.to_json)
+      end
+    end
+
+    def jobs
+      raise NoBlockGivenError unless block_given?
+
+      Batch.increment_job_queue(bid)
+      Thread.current[:bid] = bid
+      yield
+      Batch.process_successful_job(bid)
+    end
+
+    class << self
+      def process_failed_job(bid, jid)
+        to_process = Sidekiq.redis do |r|
+          r.multi do
+            r.sadd("#{bid}-failed", jid)
+            r.scard("#{bid}-failed")
+            r.get("#{bid}-to_process")
+          end
+        end
+        if to_process[2].to_i == to_process[1].to_i
+          Callback.call_if_needed(:complete, bid)
+        end
+      end
+
+      def process_successful_job(bid)
+        to_process = Sidekiq.redis do |r|
+          r.multi do
+            r.decr("#{bid}-to_process")
+            r.get("#{bid}-to_process")
+          end
+        end
+        if to_process[1].to_i == 0
+          Callback.call_if_needed(:success, bid)
+          Callback.call_if_needed(:complete, bid)
+        end
+      end
+
+      def increment_job_queue(bid)
+        Sidekiq.redis { |r| r.incr("#{bid}-to_process") }
+      end
+    end
+  end
+end
diff --git a/lib/sidekiq/batch/callback.rb b/lib/sidekiq/batch/callback.rb
new file mode 100644
index 0000000..eb3644e
--- /dev/null
+++ b/lib/sidekiq/batch/callback.rb
@@ -0,0 +1,40 @@
+module Sidekiq
+  class Batch
+    module Callback
+      class Worker
+        include Sidekiq::Worker
+
+        def perform(clazz, event, opts, bid)
+          return unless %w(success complete).include?(event)
+          instance = clazz.constantize.send(:new) rescue nil
+          return unless instance
+          instance.send("on_#{event}", Status.new(bid), opts) rescue nil
+        end
+      end
+
+      class << self
+        def call_if_needed(event, bid)
+          needed = Sidekiq.redis do |r|
+            r.multi do
+              r.hget(bid, event)
+              r.hset(bid, event, true)
+            end
+          end
+          return if 'true' == needed[0]
+          callback, opts, queue = Sidekiq.redis do |r|
+            r.hmget(bid,
+                    "callback_#{event}", "callback_#{event}_opts",
+                    'callback_queue')
+          end
+          return unless callback
+          opts    = JSON.parse(opts) if opts
+          opts  ||= {}
+          queue ||= 'default'
+          Sidekiq::Client.push('class' => Sidekiq::Batch::Callback::Worker,
+                               'args' => [callback, event, opts, bid],
+                               'queue' => queue)
+        end
+      end
+    end
+  end
+end
diff --git a/lib/sidekiq/batch/middleware.rb b/lib/sidekiq/batch/middleware.rb
new file mode 100644
index 0000000..d4775aa
--- /dev/null
+++ b/lib/sidekiq/batch/middleware.rb
@@ -0,0 +1,51 @@
+module Sidekiq
+  class Batch
+    module Middleware
+      def self.extended(base)
+        base.class_eval do
+          register_middleware
+        end
+      end
+
+      def register_middleware
+        Sidekiq.configure_server do |config|
+          config.client_middleware do |chain|
+            chain.add ClientMiddleware
+          end
+          config.server_middleware do |chain|
+            chain.add ClientMiddleware
+            chain.add ServerMiddleware
+          end
+        end
+      end
+
+      class ClientMiddleware
+        def call(_worker, msg, _queue, _redis_pool = nil)
+          if (bid = Thread.current[:bid])
+            Batch.increment_job_queue(bid) if
+            msg[:bid] = bid
+          end
+          yield
+        end
+      end
+
+      class ServerMiddleware
+        def call(_worker, msg, _queue)
+          if (bid = msg['bid'])
+            begin
+              yield
+              Batch.process_successful_job(bid)
+            rescue
+              Batch.process_failed_job(bid, msg['jid'])
+              raise
+            end
+          else
+            yield
+          end
+        end
+      end
+    end
+  end
+end
+
+Sidekiq::Batch::Middleware.send(:extend, Sidekiq::Batch::Middleware)
diff --git a/lib/sidekiq/batch/status.rb b/lib/sidekiq/batch/status.rb
new file mode 100644
index 0000000..52b9721
--- /dev/null
+++ b/lib/sidekiq/batch/status.rb
@@ -0,0 +1,34 @@
+module Sidekiq
+  class Batch
+    class Status
+      attr_reader :bid, :total, :failures, :created_at, :failure_info
+
+      def initialize(bid)
+        @bid = bid
+      end
+
+      def join
+        raise "Not supported"
+      end
+
+      def pending
+        Sidekiq.redis { |r| r.get("#{bid}-to_process") }.to_i
+      end
+
+      def complete?
+        'true' == Sidekiq.redis { |r| r.hget(bid, 'complete') }
+      end
+
+      def data
+        {
+          total: total,
+          failures: failures,
+          pending: pending,
+          created_at: created_at,
+          complete: complete?,
+          failure_info: failure_info
+        }
+      end
+    end
+  end
+end
diff --git a/lib/sidekiq/batch/version.rb b/lib/sidekiq/batch/version.rb
new file mode 100644
index 0000000..7d8aca3
--- /dev/null
+++ b/lib/sidekiq/batch/version.rb
@@ -0,0 +1,5 @@
+module Sidekiq
+  class Batch
+    VERSION = '0.1.0.pre'.freeze
+  end
+end
diff --git a/sidekiq-batch.gemspec b/sidekiq-batch.gemspec
new file mode 100644
index 0000000..4931279
--- /dev/null
+++ b/sidekiq-batch.gemspec
@@ -0,0 +1,27 @@
+# coding: utf-8
+lib = File.expand_path('../lib', __FILE__)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
+require 'sidekiq/batch/version'
+
+Gem::Specification.new do |spec|
+  spec.name          = "sidekiq-batch"
+  spec.version       = Sidekiq::Batch::VERSION
+  spec.authors       = ["Marcin Naglik"]
+  spec.email         = ["marcin.naglik@gmail.com"]
+
+  spec.summary       = "Sidekiq Batch Jobs"
+  spec.description   = "Sidekiq Batch Jobs Implementation"
+  spec.homepage      = "http://github.com/breamware/sidekiq-batch"
+  spec.license       = "MIT"
+
+  spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
+  spec.bindir        = "exe"
+  spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
+  spec.require_paths = ["lib"]
+
+  spec.add_dependency "sidekiq", "~> 4"
+
+  spec.add_development_dependency "bundler", "~> 1.12"
+  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "rspec", "~> 3.0"
+end
diff --git a/spec/integration/integration.rb b/spec/integration/integration.rb
new file mode 100644
index 0000000..edc743a
--- /dev/null
+++ b/spec/integration/integration.rb
@@ -0,0 +1,31 @@
+require 'sidekiq/batch'
+
+class TestWorker
+  include Sidekiq::Worker
+
+  def perform
+  end
+end
+
+class MyCallback
+  def on_success(status, options)
+    puts "Success #{options} #{status.data}"
+  end
+
+  def on_complete(status, options)
+    puts "Complete #{options} #{status.data}"
+  end
+end
+
+batch = Sidekiq::Batch.new
+batch.description = 'Test batch'
+batch.callback_queue = :default
+batch.on(:success, MyCallback, to: 'success@gmail.com')
+batch.on(:complete, MyCallback, to: 'complete@gmail.com')
+
+batch.jobs do
+  10.times do
+    TestWorker.perform_async
+  end
+end
+puts Sidekiq::Batch::Status.new(batch.bid).data
diff --git a/spec/sidekiq/batch/callback_spec.rb b/spec/sidekiq/batch/callback_spec.rb
new file mode 100644
index 0000000..4d00fbe
--- /dev/null
+++ b/spec/sidekiq/batch/callback_spec.rb
@@ -0,0 +1,39 @@
+require 'spec_helper'
+
+describe Sidekiq::Batch::Callback::Worker do
+  describe '#perfom' do
+    it 'does not do anything if it cannot find the callback class' do
+      subject.perform('SampleCallback', 'complete', {}, 'ABCD')
+    end
+
+    it 'does not do anything if event is different from complete or success' do
+      class SampleCallback; end
+      expect(SampleCallback).not_to receive(:new)
+      subject.perform('SampleCallback', 'ups', {}, 'ABCD')
+    end
+
+    it 'creates instance when class and event' do
+      class SampleCallback; end
+      expect(SampleCallback).to receive(:new)
+      subject.perform('SampleCallback', 'success', {}, 'ABCD')
+    end
+
+    it 'calls on_success if defined' do
+      callback_instance = double('SampleCallback')
+      class SampleCallback; end
+      expect(SampleCallback).to receive(:new).and_return(callback_instance)
+      expect(callback_instance).to receive(:on_success)
+        .with(instance_of(Sidekiq::Batch::Status), {})
+      subject.perform('SampleCallback', 'success', {}, 'ABCD')
+    end
+
+    it 'calls on_complete if defined' do
+      callback_instance = double('SampleCallback')
+      class SampleCallback; end
+      expect(SampleCallback).to receive(:new).and_return(callback_instance)
+      expect(callback_instance).to receive(:on_complete)
+        .with(instance_of(Sidekiq::Batch::Status), {})
+      subject.perform('SampleCallback', 'complete', {}, 'ABCD')
+    end
+  end
+end
diff --git a/spec/sidekiq/batch/middleware_spec.rb b/spec/sidekiq/batch/middleware_spec.rb
new file mode 100644
index 0000000..41f1e75
--- /dev/null
+++ b/spec/sidekiq/batch/middleware_spec.rb
@@ -0,0 +1,77 @@
+require 'spec_helper'
+
+describe Sidekiq::Batch::Middleware do
+  describe Sidekiq::Batch::Middleware::ServerMiddleware do
+    context 'when without batch' do
+      it 'just yields' do
+        yielded = false
+        expect(Sidekiq::Batch).not_to receive(:process_successful_job)
+        expect(Sidekiq::Batch).not_to receive(:process_failed_job)
+        subject.call(nil, {}, nil) { yielded = true }
+        expect(yielded).to be_truthy
+      end
+    end
+
+    context 'when in batch' do
+      let(:bid) { 'SAMPLEBID' }
+      context 'when successful' do
+        it 'yields' do
+          yielded = false
+          subject.call(nil, { 'bid' => bid }, nil) { yielded = true }
+          expect(yielded).to be_truthy
+        end
+
+        it 'calls process_successful_job' do
+          expect(Sidekiq::Batch).to receive(:process_successful_job).with(bid)
+          subject.call(nil, { 'bid' => bid }, nil) {}
+        end
+      end
+
+      context 'when failed' do
+        it 'calls process_failed_job and reraises exception' do
+          reraised = false
+          expect(Sidekiq::Batch).to receive(:process_failed_job)
+          begin
+            subject.call(nil, { 'bid' => bid }, nil) { raise 'ERR' }
+          rescue
+            reraised = true
+          end
+          expect(reraised).to be_truthy
+        end
+      end
+    end
+  end
+
+  describe Sidekiq::Batch::Middleware::ClientMiddleware do
+    context 'when without batch' do
+      it 'just yields' do
+        yielded = false
+        expect(Sidekiq::Batch).not_to receive(:increment_job_queue)
+        subject.call(nil, nil, nil) { yielded = true }
+        expect(yielded).to be_truthy
+      end
+    end
+
+    context 'when in batch' do
+      let(:bid) { 'SAMPLEBID' }
+      before { Thread.current[:bid] = bid }
+
+      it 'yields' do
+        yielded = false
+        subject.call(nil, {}, nil) { yielded = true }
+        expect(yielded).to be_truthy
+      end
+
+      it 'increments job queue' do
+        expect(Sidekiq::Batch).to receive(:increment_job_queue).with(bid)
+        subject.call(nil, {}, nil) {}
+      end
+
+      it 'assigns bid to msg' do
+        msg = {}
+        subject.call(nil, msg, nil) {}
+        expect(msg[:bid]).to eq(bid)
+      end
+    end
+  end
+end
diff --git a/spec/sidekiq/batch/status_spec.rb b/spec/sidekiq/batch/status_spec.rb
new file mode 100644
index 0000000..f212912
--- /dev/null
+++ b/spec/sidekiq/batch/status_spec.rb
@@ -0,0 +1,4 @@
+require 'spec_helper'
+
+describe Sidekiq::Batch::Status do
+end
diff --git a/spec/sidekiq/batch_spec.rb b/spec/sidekiq/batch_spec.rb
new file mode 100644
index 0000000..e6ec2d5
--- /dev/null
+++ b/spec/sidekiq/batch_spec.rb
@@ -0,0 +1,54 @@
+require 'spec_helper'
+
+describe Sidekiq::Batch do
+  it 'has a version number' do
+    expect(Sidekiq::Batch::VERSION).not_to be nil
+  end
+
+  describe '#initialize' do
+    subject { described_class }
+
+    it 'creates bid when called without it' do
+      expect(subject.new.bid).not_to be_nil
+    end
+
+    it 'reuses bid when called with it' do
+      batch = subject.new('dayPO5KxuRXXxw')
+      expect(batch.bid).to eq('dayPO5KxuRXXxw')
+    end
+  end
+
+  describe '#description' do
+    let(:description) { 'custom description' }
+    before { subject.description = description }
+
+    it 'sets descriptions' do
+      expect(subject.description).to eq(description)
+    end
+
+    it 'persists description' do
+      expect(Sidekiq.redis { |r| r.hget(subject.bid, 'description') })
+        .to eq(description)
+    end
+  end
+
+  describe '#callback_queue' do
+    let(:callback_queue) { 'custom_queue' }
+    before { subject.callback_queue = callback_queue }
+
+    it 'sets callback_queue' do
+      expect(subject.callback_queue).to eq(callback_queue)
+    end
+
+    it 'persists callback_queue' do
+      expect(Sidekiq.redis { |r| r.hget(subject.bid, 'callback_queue') })
+        .to eq(callback_queue)
+    end
+  end
+
+  describe '#jobs' do
+    it 'throws error if no block given' do
+      expect { subject.jobs }.to raise_error Sidekiq::Batch::NoBlockGivenError
+    end
+  end
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
new file mode 100644
index 0000000..541117e
--- /dev/null
+++ b/spec/spec_helper.rb
@@ -0,0 +1,2 @@
+$LOAD_PATH.unshift File.expand_path('../../lib', __FILE__)
+require 'sidekiq/batch'