diff --git a/.travis.yml b/.travis.yml
index 7336dd02..f6039a30 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,16 +14,17 @@ addons:
     packages:
       - libgmp-dev
 
+env:
+  - COMPONENT=client
+  - COMPONENT=server
+
 before_install:
   - mkdir -p ~/.local/bin
   - export PATH=$HOME/.local/bin:$PATH
   - curl -L https://www.stackage.org/stack/linux-x86_64 | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'
 
 script:
-  # Set a timeout of 35 minutes. We could use travis_wait here, but travis_wait
-  # doesn't produce any output until the command finishes, and also doesn't
-  # always show all of the command's output.
-  - timeout 35m stack --no-terminal -j1 --install-ghc build
+  ./ci/build.sh
 
 notifications:
   email: true
diff --git a/ci/build.sh b/ci/build.sh
new file mode 100755
index 00000000..d03185a0
--- /dev/null
+++ b/ci/build.sh
@@ -0,0 +1,22 @@
+#! /usr/bin/env bash
+
+set -ex
+
+case $COMPONENT in
+  server)
+    # Set a timeout of 35 minutes. We could use travis_wait here, but travis_wait
+    # doesn't produce any output until the command finishes, and also doesn't
+    # always show all of the command's output.
+    timeout 35m stack --no-terminal -j1 --install-ghc build
+    ;;
+  client)
+    cd client
+    npm install
+    npm run build
+    npm run bundle
+    ;;
+  *)
+    echo >&2 "Unrecognised component: $COMPONENT"
+    exit 1
+    ;;
+esac