diff --git a/.travis.yml b/.travis.yml
index 73d7f622..73aa542f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,16 +2,6 @@ sudo: false       # use faster docker containers
 language: node_js
 node_js:
   - "0.12"
-before_script:
-  - npm install -g eslint
-  - npm install -g esprima-fb   # allow flow type annotations in eslint
-  - curl 'https://raw.githubusercontent.com/ripple/javascript-style-guide/es6/eslintrc' > ./eslintrc
-  - 'echo "parser: esprima-fb" >> ./eslintrc'
-  - eslint --reset -c ./eslintrc $(git --no-pager diff --name-only -M100% --diff-filter=AM --relative $(git merge-base FETCH_HEAD origin/HEAD) FETCH_HEAD | grep "\.js$")
-  - npm install -g flow-bin
-  - npm run typecheck
-script: MOCHA_REPORTER=tap npm test --coverage
-after_success:
-- npm run coveralls
+script: bin/ci.sh
 notifications:
   email: false
diff --git a/bin/ci.sh b/bin/ci.sh
new file mode 100755
index 00000000..7a7c9aae
--- /dev/null
+++ b/bin/ci.sh
@@ -0,0 +1,54 @@
+#!/bin/bash -ex
+
+NODE_INDEX="$1"
+TOTAL_NODES="$2"
+
+typecheck() {
+  npm install -g flow-bin
+  npm run typecheck
+}
+
+lint() {
+  REPO_URL="https://raw.githubusercontent.com/ripple/javascript-style-guide"
+  npm install -g eslint
+  npm install -g esprima-fb   # allow flow type annotations in eslint
+  curl "$REPO_URL/es6/eslintrc" > ./eslintrc
+  echo "parser: esprima-fb" >> ./eslintrc
+  eslint --reset -c ./eslintrc $(git --no-pager diff --name-only -M100% --diff-filter=AM --relative $(git merge-base FETCH_HEAD origin/HEAD) FETCH_HEAD | grep "\.js$")
+}
+
+unittest() {
+  npm test --coverage
+  npm run coveralls
+}
+
+oneNode() {
+  lint
+  typecheck
+  unittest
+}
+
+twoNodes() {
+  case "$NODE_INDEX" in
+    0) lint && unittest;;
+    1) typecheck;;
+    *) echo "ERROR: invalid usage"; exit 2;;
+  esac
+}
+
+threeNodes() {
+  case "$NODE_INDEX" in
+    0) lint;;
+    1) typecheck;;
+    2) unittest;;
+    *) echo "ERROR: invalid usage"; exit 2;;
+  esac
+}
+
+case "$TOTAL_NODES" in
+  "") oneNode;;
+  1) oneNode;;
+  2) twoNodes;;
+  3) threeNodes;;
+  *) echo "ERROR: invalid usage"; exit 2;;
+esac
diff --git a/circle.yml b/circle.yml
index 47ff3a80..a0cd477e 100644
--- a/circle.yml
+++ b/circle.yml
@@ -1,18 +1,7 @@
 machine:
   node:
     version: 0.12.0
-dependencies:
-  post:
-    - npm install -g eslint
-    - npm install -g esprima-fb   # allow flow type annotations in eslint
-    - npm install -g flow-bin
 test:
-  pre:
-    - curl 'https://raw.githubusercontent.com/ripple/javascript-style-guide/es6/eslintrc' > ./eslintrc
-    - 'echo "parser: esprima-fb" >> ./eslintrc'
-    - eslint --reset -c ./eslintrc $(git --no-pager diff --name-only -M100% --diff-filter=AM --relative $(git merge-base FETCH_HEAD origin/HEAD) FETCH_HEAD | grep "\.js$")
-    - npm run typecheck
   override:
-    - npm test --coverage
-  post:
-    - npm run coveralls
+    - bin/ci.sh "$CIRCLE_NODE_INDEX" "$CIRCLE_NODE_TOTAL":
+        parallel: true