diff --git a/.buildkite/brewfile b/.buildkite/brewfile
new file mode 100644
index 000000000..b81c12211
--- /dev/null
+++ b/.buildkite/brewfile
@@ -0,0 +1,4 @@
+brew "pkg-config"
+brew "libxml2"
+brew "imagemagick@6"
+brew "git-lfs"
\ No newline at end of file
diff --git a/.buildkite/gem-push.sh b/.buildkite/gem-push.sh
new file mode 100755
index 000000000..44999de32
--- /dev/null
+++ b/.buildkite/gem-push.sh
@@ -0,0 +1,18 @@
+#!/bin/bash -eu
+
+echo "--- :beer: Installing Dependencies"
+brew bundle --file .buildkite/brewfile
+
+echo "--- :rubygems: Setting up Gems"
+install_gems
+
+echo "--- :hammer: Build Gemspec"
+gem build fastlane-plugin-wpmreleasetoolkit.gemspec
+
+echo "--- :sleuth_or_spy: Validate Gem Install"
+gem install --user-install fastlane-plugin-wpmreleasetoolkit-*.gem
+
+echo "--- :rubygems: Gem Push"
+echo ":rubygems_api_key: ${RUBYGEMS_API_KEY}" >>".gem-credentials"
+chmod 600 ".gem-credentials"
+gem push --config-file ".gem-credentials" fastlane-plugin-wpmreleasetoolkit-*.gem
diff --git a/.buildkite/pipeline.yml b/.buildkite/pipeline.yml
new file mode 100644
index 000000000..42b75e3c4
--- /dev/null
+++ b/.buildkite/pipeline.yml
@@ -0,0 +1,77 @@
+# Nodes with values to reuse in the pipeline.
+common_params:
+  plugins: &common_plugins
+  - &bash_cache automattic/bash-cache#v1.3.2: ~
+  env: &common_env
+    IMAGE_ID: xcode-12.5.1
+
+steps:
+  #################
+  # Build and Test
+  #################
+  - label: "🧪 Build and Test"
+    key: "test"
+    command: |
+      echo "--- :beer: Installing Dependencies"
+      brew bundle --file .buildkite/brewfile
+
+      echo "--- :rubygems: Setting up Gems"
+      install_gems
+
+      echo "--- :hammer: Build DrawText"
+      bundle exec rake compile
+
+      echo "--- :git: Setting up git-lfs"
+      git-lfs install
+
+      echo "--- :rspec: Run Rspec"
+      bundle exec rspec --profile 10 --format progress
+    env: *common_env
+    plugins: *common_plugins
+    agents:
+      queue: "mac"
+
+  #################
+  # Lint
+  #################
+  - label: "🧹 Lint"
+    command: |
+      echo "--- :rubygems: Setting up Gems"
+      install_gems
+
+      echo "--- :rubocop: Run Rubocop"
+      bundle exec rubocop
+    env: *common_env
+    plugins: *common_plugins
+    agents:
+      queue: "mac"
+
+  #################
+  # Danger
+  #################
+  - label: "⛔️ Danger"
+    command: |
+      echo "--- :rubygems: Setting up Gems"
+      install_gems
+
+      echo "--- :rubocop: Run Danger"
+      bundle exec danger
+    env: *common_env
+    plugins: *common_plugins
+    agents:
+      queue: "mac"
+
+  #################
+  # Push to RubyGems
+  #################
+  - label: ":rubygems: Publish to RubyGems"
+    key: "gem-push"
+    if: build.tag != null
+    # Note: We intentionally call a separate `.sh` script here (as opposed to having all the 
+    # commands written inline) to avoid leaking a key used in the process in clear in the
+    # BUILDKITE_COMMAND environment variable.
+    command: .buildkite/gem-push.sh
+    env: *common_env
+    plugins: *common_plugins
+    agents:
+      queue: "mac"
diff --git a/.bundle/config b/.bundle/config
index 5fc4c9f0e..724931e27 100644
--- a/.bundle/config
+++ b/.bundle/config
@@ -1,3 +1,3 @@
 ---
+BUNDLE_PATH: "vendor/bundle"
 BUNDLE_SPECIFIC_PLATFORM: "false"
-BUNDLE_WITH: "test"
diff --git a/.circleci/.brewfile b/.circleci/.brewfile
deleted file mode 100644
index 5b7ff29d0..000000000
--- a/.circleci/.brewfile
+++ /dev/null
@@ -1,3 +0,0 @@
-pkg-config
-libxml2
-imagemagick@6
\ No newline at end of file
diff --git a/.circleci/cache-version b/.circleci/cache-version
deleted file mode 100644
index fc10ecf80..000000000
--- a/.circleci/cache-version
+++ /dev/null
@@ -1,2 +0,0 @@
-# To invalidate the cache, generate a new UUID using `uuidgen` on the command line then paste it here
-24D38297-3B05-4032-96E8-4D606515BAC1
\ No newline at end of file
diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index d6d2f932c..000000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,100 +0,0 @@
-version: 2.1
-
-orbs:
-  ios: wordpress-mobile/ios@1.0
-
-# Common steps reused on various jobs
-commands:
-  setup_tools:
-    description: "Install Homebrew and Ruby dependencies"
-    parameters:
-      skip_brew_install:
-        type: boolean
-        default: false
-    steps:
-      - restore_cache:
-          name: Restore Homebrew + Ruby Dependencies
-          keys:
-            - &cache_key brew-dependencies-{{ checksum ".circleci/cache-version" }}-{{ checksum ".circleci/.brewfile" }}-{{ checksum "Gemfile.lock" }}
-      - unless:
-          condition: <<parameters.skip_brew_install>>
-          steps:
-            - run:
-                name: Install Homebrew dependencies, if neeeded
-                command: |
-                  # Because the CircleCI image uses shallow clones, we need to unshallow them first. See https://bit.ly/3vx6EAL
-                  git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow
-                  git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask fetch --unshallow
-                  brew update && xargs brew install --verbose < .circleci/.brewfile
-      - run:
-          name: Install Ruby dependencies, if neeeded
-          command: bundle check --path vendor/bundle || bundle install
-      - save_cache:
-          name: Cache Homebrew + Ruby Dependencies
-          key: *cache_key
-          paths:
-            - vendor/
-            - /usr/local/Cellar
-
-jobs:
-  test:
-    executor:
-      name: ios/default
-      xcode-version: "11.2.1"
-    environment:
-      HOMEBREW_NO_AUTO_UPDATE: 1
-      PKG_CONFIG_PATH: "/usr/local/opt/imagemagick@6/lib/pkgconfig"
-    steps:
-      - checkout
-      - setup_tools
-      - run: # Compile drawText
-          name: Compile drawText
-          command: bundle exec rake compile
-      - run:
-          name: Run rspec and upload coverage report
-          command: |
-            bundle exec rspec --profile 10 \
-                              --format RspecJunitFormatter \
-                              --out test_results/rspec.xml \
-                              --format progress \
-                              $(circleci tests glob "spec/**/*_spec.rb" | circleci tests split --split-by=timings)
-      # Save test results for timing analysis
-      - store_test_results:
-          path: test_results
-
-      # Coverage reports are sent to Codecov as part of running `rspec`, not as a CircleCI step.
-      # We may wish to change this for consistency.
-
-  gem-push:
-    executor:
-      name: ios/default
-      xcode-version: "11.2.1" # We need an Xcode-enabled CI image to build drawText during gem build
-    steps:
-      - checkout
-      - setup_tools:
-          skip_brew_install: true
-      - run:
-          name: Build gem
-          command: gem build fastlane-plugin-wpmreleasetoolkit.gemspec
-      - run:
-          name: Check the gem is installable
-          command: gem install --user-install fastlane-plugin-wpmreleasetoolkit-*.gem
-      - run:
-          name: Push to RubyGems
-          command: |
-            echo ":rubygems_api_key: ${GEM_HOST_API_KEY}" >>"$HOME/.gem/credentials"
-            chmod 600 "$HOME/.gem/credentials"
-            gem push fastlane-plugin-wpmreleasetoolkit-*.gem
-
-workflows:
-  test:
-    jobs:
-      - test
-  release:
-    jobs:
-      - gem-push:
-          filters:
-            tags:
-              only: /.*/
-            branches:
-              ignore: /.*/
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
deleted file mode 100644
index 1d9e3d7d9..000000000
--- a/.github/workflows/ci.yml
+++ /dev/null
@@ -1,32 +0,0 @@
-name: Danger
-on:
-  pull_request:
-    types: [opened, reopened, synchronize]
-
-jobs:
-  danger:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 150
-
-      # This action reads the Ruby version from .ruby-version
-      - uses: ruby/setup-ruby@v1
-
-      - uses: actions/cache@v2
-        with:
-          path: vendor/bundle
-          key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-gems-
-
-      - name: Install Gems
-        run: |
-          bundle config path vendor/bundle
-          BUNDLE_WITHOUT=test bundle install --jobs 4 --retry 3
-
-      - name: Run Danger
-        run: bundle exec danger
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1e0384bd4..e1b4568b1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,7 +18,7 @@ _None_
 
 ### Internal Changes
 
-_None_
+- Replace CircleCI and GitHub Actions with Buildkite
 
 ## 1.4.0
 
diff --git a/Gemfile b/Gemfile
index 3e5adfe1a..8bc3507e5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,12 +5,9 @@ gemspec
 gem 'danger', '~> 8.0'
 gem 'danger-rubocop', '~> 0.6'
 
-group :test do
-  gem 'codecov', require: false
-  gem 'rspec'
-  gem 'webmock', require: false, group: :test
-  gem 'yard'
-end
+gem 'codecov', require: false
+gem 'webmock', require: false
+gem 'yard'
 
 plugins_path = File.join(File.dirname(__FILE__), 'fastlane', 'Pluginfile')
 eval_gemfile(plugins_path) if File.exist?(plugins_path)
diff --git a/Gemfile.lock b/Gemfile.lock
index c932c79b3..1b6321e6a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -414,7 +414,9 @@ DEPENDENCIES
   fastlane-plugin-wpmreleasetoolkit!
   pry (~> 0.12.2)
   rmagick (~> 4.1)
-  rspec
+  rspec (~> 3.8)
+  rspec-expectations (~> 3.8)
+  rspec-mocks (~> 3.8)
   rspec_junit_formatter (~> 0.4.1)
   rubocop (~> 1.0)
   rubocop-require_tools (~> 0.1.2)
@@ -424,4 +426,4 @@ DEPENDENCIES
   yard
 
 BUNDLED WITH
-   2.2.25
+   2.2.27
diff --git a/lib/fastlane/plugin/wpmreleasetoolkit/actions/android/android_download_file_by_version.rb b/lib/fastlane/plugin/wpmreleasetoolkit/actions/android/android_download_file_by_version.rb
index 301f427eb..967e42247 100644
--- a/lib/fastlane/plugin/wpmreleasetoolkit/actions/android/android_download_file_by_version.rb
+++ b/lib/fastlane/plugin/wpmreleasetoolkit/actions/android/android_download_file_by_version.rb
@@ -27,7 +27,7 @@ def self.description
 
       def self.details
         'This action extracts the version of the library which is imported by the client app' \
-        'and downloads the request file from the relevant GitHub release'
+          'and downloads the request file from the relevant GitHub release'
       end
 
       def self.available_options
diff --git a/lib/fastlane/plugin/wpmreleasetoolkit/actions/common/check_translation_progress.rb b/lib/fastlane/plugin/wpmreleasetoolkit/actions/common/check_translation_progress.rb
index 07f260ee8..3e90a0c1d 100644
--- a/lib/fastlane/plugin/wpmreleasetoolkit/actions/common/check_translation_progress.rb
+++ b/lib/fastlane/plugin/wpmreleasetoolkit/actions/common/check_translation_progress.rb
@@ -98,7 +98,7 @@ def self.description
 
       def self.details
         'This actions checks the current status of the translations on GlotPress ' \
-        'and raises an error if it\'s below the provided threshold'
+          'and raises an error if it\'s below the provided threshold'
       end
 
       def self.available_options
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index a30e654b0..9fc311a64 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -2,6 +2,7 @@
 
 require 'simplecov'
 require 'codecov'
+require 'webmock/rspec'
 
 # SimpleCov.minimum_coverage 95
 SimpleCov.start