diff --git a/.circleci/config.yml b/.circleci/config.yml
new file mode 100644
index 00000000..696f4882
--- /dev/null
+++ b/.circleci/config.yml
@@ -0,0 +1,158 @@
+version: 2.1
+
+orbs:
+  win: circleci/windows@2.2.0
+
+jobs:
+  test_linux:
+    parameters:
+      ruby_version:
+        description: "version tag for the veracross/circleci-ruby-freetds container"
+        type: string
+
+    docker:
+      - image: veracross/circleci-ruby-freetds:latest
+      - image: metaskills/mssql-server-linux-tinytds:2017-GA
+
+    working_directory: ~/repo
+
+    steps:
+      - checkout
+
+      - restore_cache:
+          name: restore gem cache
+          keys:
+            - v1-bundle-<< parameters.ruby_version >>-{{ .Branch }}-{{ checksum "tiny_tds.gemspec" }}
+            - v1-bundle-<< parameters.ruby_version >>-{{ .Branch }}-
+            - v1-bundle-<< parameters.ruby_version >>-
+
+      - run:
+          name: install dependencies
+          command: |
+            bundle check --path ./vendor/bundle || bundle install --jobs=3 --retry=3 --path vendor/bundle
+            bundle clean
+
+      - save_cache:
+          name: save gem cache
+          paths:
+            - ./vendor/bundle
+          key: v1-bundle-<< parameters.ruby_version >>-{{ .Branch }}-{{ checksum "tiny_tds.gemspec" }}
+
+      - run:
+          name: build gem
+          command: |
+            bundle exec rake build
+
+      - run:
+          # imported from setup.sh, although we should do better...
+          name: wait for database
+          command: |
+            sleep 10
+
+      - run:
+          name: run tests
+          command: |
+            TINYTDS_UNIT_HOST=localhost bundle exec rake test
+
+  test_windows:
+    parameters:
+      ruby_version:
+        description: "version tag for the veracross/circleci-ruby-freetds container"
+        type: string
+
+    executor:
+      name: win/default
+      shell: powershell.exe
+
+    steps:
+      # - run:
+      #     name: diagnostics
+      #     command: |
+      #       systeminfo
+      #       pwd
+      #       where perl
+      #       perl --version
+      #       ruby --version
+      #       gem --version
+
+      - run:
+          name: install msys2
+          command: |
+            choco install msys2
+
+      - run:
+          name: ridk install
+          command: |
+            ridk install 2 3
+
+      # - run:
+      #     name: diagnostics- perl modules
+      #     command: |
+      #       cpan -l
+
+      # - run:
+      #     name: install Pod::Usage
+      #     command: |
+      #       cpanm Pod::Usage
+
+      - checkout
+
+      - restore_cache:
+          name: restore gem cache
+          keys:
+            - v1-bundle-<< parameters.ruby_version >>-{{ .Branch }}-{{ checksum "tiny_tds.gemspec" }}
+            - v1-bundle-<< parameters.ruby_version >>-{{ .Branch }}-
+            - v1-bundle-<< parameters.ruby_version >>-
+
+      - run:
+          name: install dependencies
+          command: |
+            bundle install --jobs=3 --retry=3 --path ./vendor/bundle
+            bundle clean
+
+      - save_cache:
+          name: save gem cache
+          paths:
+            - ./vendor/bundle
+          key: v1-bundle-<< parameters.ruby_version >>-{{ .Branch }}-{{ checksum "tiny_tds.gemspec" }}
+
+      - run:
+          name: install ports
+          no_output_timeout: 60m
+          command: |
+            ridk enable
+            bundle exec rake ports
+
+      - run:
+          name: build gem
+          command: |
+            bundle exec rake build
+
+      - run:
+          # imported from setup.sh, although we should do better...
+          name: wait for database
+          command: |
+            sleep 10
+
+      - run:
+          name: run tests
+          command: |
+            TINYTDS_UNIT_HOST=localhost bundle exec rake test
+
+workflows:
+  test_supported_ruby_versions:
+    jobs:
+      # - test_linux:
+      #     matrix:
+      #       parameters:
+      #         ruby_version:
+      #           - '2.5.3'
+      #           - '2.7'
+
+
+      - test_windows:
+          matrix:
+            parameters:
+              ruby_version:
+                # - '2.5.3'
+                - '2.7'