diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
new file mode 100644
index 0000000000000..e814b2af5e527
--- /dev/null
+++ b/.gitlab-ci.yml
@@ -0,0 +1,83 @@
+# use the official gcc image, based on debian
+# can use versions as well, like gcc:5.2
+# see https://hub.docker.com/_/gcc/
+image: gcc
+
+stages:
+  - pre-build
+  - build
+  - test
+
+.linux_set_path: &linux_set_path_def
+  before_script:
+    - export PATH=$(pwd)/bin:$PATH
+  tags:
+    - linux
+
+.windows_set_path: &win_set_path_def
+  before_script:
+    - set PATH=%CD%\bin;%PATH%
+  tags:
+    - windows
+
+build-linux:
+  stage: build
+  script:
+    - sh ci/build.sh
+  artifacts:
+    paths:
+      - bin/nim
+      - bin/nimd
+      - compiler/nim
+      - koch
+    expire_in: 1 week
+  tags:
+    - linux
+
+build-windows:
+  stage: build
+  script:
+    - ci\build.bat
+  artifacts:
+    paths:
+      - bin\nim.exe
+      - bin\nimd.exe
+      - compiler\nim.exe
+      - koch.exe
+    expire_in: 1 week
+  tags:
+    - windows
+
+test-linux:
+  stage: test
+  <<: *linux_set_path_def
+  script:
+    - sh ci/deps.sh
+    - nim c --taintMode:on tests/testament/tester
+    - tests/testament/tester --pedantic all
+  tags:
+    - linux
+
+test-windows:
+  stage: test
+  <<: *win_set_path_def
+  script:
+    - call ci\deps.bat
+    - nim c --taintMode:on tests\testament\tester
+    - tests\testament\tester.exe --pedantic all
+  tags:
+    - windows
+
+.csources: &csources_definition
+  stage: test
+  script:
+    - nim -v
+    - ./koch csources
+    - ./koch xz
+  artifacts:
+    paths:
+      - csources
+
+csources-linux:
+  <<: *csources_definition
+  <<: *linux_set_path_def
diff --git a/ci/build.bat b/ci/build.bat
new file mode 100644
index 0000000000000..cdce8d3d2927a
--- /dev/null
+++ b/ci/build.bat
@@ -0,0 +1,14 @@
+REM Some debug info
+echo "Running on %CI_RUNNER_ID% (%CI_RUNNER_DESCRIPTION%) with tags %CI_RUNNER_TAGS%."
+gcc -v
+
+git clone --depth 1 https://github.com/nim-lang/csources.git
+cd csources
+call build64.bat
+cd ..
+set PATH=%CD%\bin;%PATH%
+nim -v
+nim c koch
+koch.exe boot
+copy bin/nim bin/nimd
+koch.exe boot -d:release
diff --git a/ci/build.sh b/ci/build.sh
new file mode 100644
index 0000000000000..a0fee149775d5
--- /dev/null
+++ b/ci/build.sh
@@ -0,0 +1,15 @@
+sh ci/deps.sh
+
+# Build from C sources.
+git clone --depth 1 https://github.com/nim-lang/csources.git
+cd csources
+sh build.sh
+cd ..
+# Add Nim to the PATH
+export PATH=$(pwd)/bin:$PATH
+# Bootstrap.
+nim -v
+nim c koch
+./koch boot
+cp bin/nim bin/nimd
+./koch boot -d:release
diff --git a/ci/deps.bat b/ci/deps.bat
new file mode 100644
index 0000000000000..d73a7b5af5f34
--- /dev/null
+++ b/ci/deps.bat
@@ -0,0 +1,5 @@
+# Nimble deps
+nim e install_nimble.nims
+nim e tests/test_nimscript.nims
+nimble update
+nimble install -y zip opengl sdl1 jester niminst
diff --git a/ci/deps.sh b/ci/deps.sh
new file mode 100644
index 0000000000000..9ca70b6d2a6b6
--- /dev/null
+++ b/ci/deps.sh
@@ -0,0 +1,19 @@
+# Some debug info
+echo "Running on $CI_RUNNER_ID ($CI_RUNNER_DESCRIPTION) with tags $CI_RUNNER_TAGS."
+gcc -v
+# Packages
+apt-get update -qq
+apt-get install -y -qq libcurl4-openssl-dev libsdl1.2-dev libgc-dev nodejs
+# FASM
+wget http://nim-lang.org/download/fasm-1.71.39.tgz
+tar xvf fasm-1.71.39.tgz
+# PATH handling
+export PATH=$(pwd)/fasm:$PATH
+which fasm
+export PATH=$(pwd)/bin:$PATH
+
+# Nimble deps
+nim e install_nimble.nims
+nim e tests/test_nimscript.nims
+nimble update
+nimble install zip opengl sdl1 jester niminst