diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6d1d762
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,40 @@
+# TODO: Add comments/docs for these.
+.*\.py[co]
+.*\.pyc-2.4
+.*~
+.*\.orig
+.*\.swp
+.*\#.*
+.*@.*
+.nyc_output
+index\.yaml
+REVISION
+.coverage
+coverage
+htmlcov
+.DS_Store
+workspace.xml
+static_src/**/*\.min.js*
+static/dist
+node_modules
+elements/mock-data/*\.json
+!elements/mock-data/gates-mock.json
+app.yaml
+app.prod.yaml
+module-besearch.yaml
+besearch.prod.yaml
+besearch.yaml
+module-latency-insensitive.yaml
+latency-insensitive.prod.yaml
+latency-insensitive.yaml
+module-api.yaml
+templates/webpack-out
+full_results.json
+
+# Python 3 virtual environment. Created with `python3 -m venv venv`.
+venv/
+venv3/
+
+# Python third-party libraries.
+# https://cloud.google.com/appengine/docs/standard/python3/specifying-dependencies
+lib