diff --git a/.circleci/config.yml b/.circleci/config.yml
index 6746f8e7bf..4100c3b117 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,36 +1,88 @@
 version: 2
 
+unit_tests: &unit_tests
+  steps:
+    - checkout
+    - run:
+        name: Create Checksum
+        command: sh .circleci/checksum.sh /tmp/checksums.txt
+    - restore_cache:
+        keys:
+          - npm-cache-{{ checksum "/tmp/checksums.txt" }}
+    - run:
+        name: Install Dependencies
+        command: yarn install
+    - save_cache:
+        key: npm-cache-{{ checksum "/tmp/checksums.txt" }}
+        paths:
+          - ./node_modules
+          - ./yarn.lock
+          - ./packages/*/node_modules
+          - ./packages/*/yarn.lock
+    - run:
+        name: Compile code
+        command: yarn compile
+    - run:
+        name: Unit tests
+        command: yarn test:node
+    - run:
+        name: report coverage
+        command: yarn codecov
+
+browsers_unit_tests: &browsers_unit_tests
+  steps:
+    - checkout
+    - run:
+        name: Install Dependencies
+        command: yarn install
+    - run:
+        name: Compile code
+        command: yarn compile
+    - run:
+        name: Unit tests
+        command: yarn test:browser
+
 jobs:
-  build:
+  lint:
     docker:
-      - image: circleci/node:12-browsers
+      - image: node
     steps:
       - checkout
       - run:
-          name: Create Checksum
-          command: sh .circleci/checksum.sh /tmp/checksums.txt
-      - restore_cache:
-          keys:
-            - npm-cache-{{ checksum "/tmp/checksums.txt" }}
-      - run:
-          name: Install Dependencies
+          name: Install modules and dependencies.
           command: yarn install
-      - save_cache:
-          key: npm-cache-{{ checksum "/tmp/checksums.txt" }}
-          paths:
-            - ./node_modules
-            - ./yarn.lock
-            - ./packages/*/node_modules
-            - ./packages/*/yarn.lock
       - run:
-          name: Lint
+          name: Check code style and linting
           command: yarn run check
-      - run:
-          name: Compile
-          command: yarn compile
-      - run:
-          name: Test
-          command: yarn test
-      - run:
-          name: report-coverage
-          command: yarn codecov
+  node8:
+    docker:
+      - image: node:8
+    <<: *unit_tests
+  node10:
+    docker:
+      - image: node:10
+    <<: *unit_tests
+  node11:
+    docker:
+      - image: node:11
+    <<: *unit_tests
+  node12:
+    docker:
+      - image: node:12
+    <<: *unit_tests
+  node12-browsers:
+    docker:
+      - image: circleci/node:12-browsers
+    <<: *browsers_unit_tests
+
+
+workflows:
+  version: 2
+  build:
+    jobs:
+      - lint
+      - node8
+      - node10
+      - node11
+      - node12
+      - node12-browsers
diff --git a/package.json b/package.json
index c24c127fdb..14abd7140a 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,8 @@
     "fix": "lerna run fix",
     "postinstall": "yarn run bootstrap",
     "compile": "lerna run compile",
-    "test": "lerna run test",
+    "test:node": "lerna run test:node",
+    "test:browser": "lerna run test:browser",
     "bootstrap": "lerna bootstrap",
     "bump": "lerna publish",
     "codecov": "lerna run codecov",
diff --git a/packages/opentelemetry-basic-tracer/package.json b/packages/opentelemetry-basic-tracer/package.json
index 5a53a61866..b0c0e0dfad 100644
--- a/packages/opentelemetry-basic-tracer/package.json
+++ b/packages/opentelemetry-basic-tracer/package.json
@@ -6,14 +6,13 @@
   "types": "build/src/index.d.ts",
   "repository": "open-telemetry/opentelemetry-js",
   "scripts": {
-    "test": "c8 ts-mocha -p tsconfig.json test/**/*.ts",
+    "test:node": "c8 ts-mocha -p tsconfig.json test/**/*.ts",
     "tdd": "yarn test -- --watch-extensions ts --watch",
     "codecov": "c8 report --reporter=json && codecov -f coverage/*.json -p ../../",
     "clean": "rimraf build/*",
     "check": "gts check",
     "compile": "tsc -p .",
-    "fix": "gts fix",
-    "posttest": "yarn run check"
+    "fix": "gts fix"
   },
   "keywords": [
     "opentelemetry",
diff --git a/packages/opentelemetry-core/package.json b/packages/opentelemetry-core/package.json
index 7a5f44498b..24e0732e73 100644
--- a/packages/opentelemetry-core/package.json
+++ b/packages/opentelemetry-core/package.json
@@ -19,8 +19,7 @@
     "clean": "rimraf build/*",
     "check": "gts check",
     "compile": "tsc -p .",
-    "fix": "gts fix",
-    "posttest": "yarn run check"
+    "fix": "gts fix"
   },
   "keywords": [
     "opentelemetry",
diff --git a/packages/opentelemetry-node-tracer/package.json b/packages/opentelemetry-node-tracer/package.json
index 885c819a2c..59ed542694 100644
--- a/packages/opentelemetry-node-tracer/package.json
+++ b/packages/opentelemetry-node-tracer/package.json
@@ -6,14 +6,13 @@
   "types": "build/src/index.d.ts",
   "repository": "open-telemetry/opentelemetry-js",
   "scripts": {
-    "test": "c8 ts-mocha -p tsconfig.json test/**/*.ts",
+    "test:node": "c8 ts-mocha -p tsconfig.json test/**/*.ts",
     "tdd": "yarn test -- --watch-extensions ts --watch",
     "codecov": "c8 report --reporter=json && codecov -f coverage/*.json -p ../../",
     "clean": "rimraf build/*",
     "check": "gts check",
     "compile": "tsc -p .",
-    "fix": "gts fix",
-    "posttest": "yarn run check"
+    "fix": "gts fix"
   },
   "keywords": [
     "opentelemetry",
diff --git a/packages/opentelemetry-scope-async-hooks/package.json b/packages/opentelemetry-scope-async-hooks/package.json
index d783127d84..7fa20b01b8 100644
--- a/packages/opentelemetry-scope-async-hooks/package.json
+++ b/packages/opentelemetry-scope-async-hooks/package.json
@@ -6,14 +6,13 @@
   "types": "build/src/index.d.ts",
   "repository": "open-telemetry/opentelemetry-js",
   "scripts": {
-    "test": "c8 ts-mocha -p tsconfig.json test/**/*.ts",
+    "test:node": "c8 ts-mocha -p tsconfig.json test/**/*.ts",
     "tdd": "yarn test -- --watch-extensions ts --watch",
     "codecov": "c8 report --reporter=json && codecov -f coverage/*.json -p ../../",
     "clean": "rimraf build/*",
     "check": "gts check",
     "compile": "tsc -p .",
-    "fix": "gts fix",
-    "posttest": "yarn run check"
+    "fix": "gts fix"
   },
   "keywords": [
     "opentelemetry",
diff --git a/packages/opentelemetry-scope-base/package.json b/packages/opentelemetry-scope-base/package.json
index 75b7020299..e8bc0d9e2f 100644
--- a/packages/opentelemetry-scope-base/package.json
+++ b/packages/opentelemetry-scope-base/package.json
@@ -6,14 +6,13 @@
   "types": "build/src/index.d.ts",
   "repository": "open-telemetry/opentelemetry-js",
   "scripts": {
-    "test": "c8 ts-mocha -p tsconfig.json test/**/*.ts",
+    "test:node": "c8 ts-mocha -p tsconfig.json test/**/*.ts",
     "tdd": "yarn test -- --watch-extensions ts --watch",
     "codecov": "c8 report --reporter=json && codecov -f coverage/*.json -p ../../",
     "clean": "rimraf build/*",
     "check": "gts check",
     "compile": "tsc -p .",
-    "fix": "gts fix",
-    "posttest": "yarn run check"
+    "fix": "gts fix"
   },
   "keywords": [
     "opentelemetry",