diff --git a/.ci/.gitignore b/.ci/.gitignore
new file mode 100644
index 0000000..1fd44ac
--- /dev/null
+++ b/.ci/.gitignore
@@ -0,0 +1 @@
+/cached-shell
diff --git a/.ci/cache-shell.sh b/.ci/cache-shell.sh
new file mode 100755
index 0000000..b810324
--- /dev/null
+++ b/.ci/cache-shell.sh
@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+source "$(dirname "${BASH_SOURCE[0]}")/common.sh"
+
+>&2 echo "Caching dev shell"
+nix print-dev-env "${base}#" >"${cached_shell}"
diff --git a/.ci/common.sh b/.ci/common.sh
new file mode 100644
index 0000000..1c8d67c
--- /dev/null
+++ b/.ci/common.sh
@@ -0,0 +1,7 @@
+# Use as:
+#
+# source "$(dirname "${BASH_SOURCE[0]}")/common.sh"
+
+set -euo pipefail
+base="$(readlink -f $(dirname "${BASH_SOURCE[0]}")/..)"
+cached_shell="${base}/.ci/cached-shell"
diff --git a/.ci/run b/.ci/run
new file mode 100755
index 0000000..67b60b0
--- /dev/null
+++ b/.ci/run
@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+source "$(dirname "${BASH_SOURCE[0]}")/common.sh"
+
+if [[ ! -f "${cached_shell}" ]]; then
+	>&2 echo "No cached shell in ${cached_shell}"
+	exit 1
+fi
+
+. "${cached_shell}"
+exec "$@"