diff --git a/.github/buildomat/README.md b/.github/buildomat/README.md
new file mode 100644
index 0000000000000..ee18e415a1eea
--- /dev/null
+++ b/.github/buildomat/README.md
@@ -0,0 +1,5 @@
+# Buildomat CI
+
+For builds on illumos, we use Oxide Computer's [Buildomat CI](https://github.com/oxidecomputer/buildomat).
+
+Compute resources for CI are provided by Oxide Computer.
diff --git a/.github/buildomat/build-and-test.sh b/.github/buildomat/build-and-test.sh
new file mode 100644
index 0000000000000..3f104fa7cf99a
--- /dev/null
+++ b/.github/buildomat/build-and-test.sh
@@ -0,0 +1,20 @@
+#!/bin/env bash
+
+set -o errexit
+set -o pipefail
+set -o xtrace
+
+# Enable ANSI colors in Cargo output.
+export CARGO_TERM_COLOR=always
+
+cargo --version
+rustc --version
+
+banner libc
+ptime -m cargo build --verbose
+
+banner test
+ptime -m cargo test --verbose
+
+banner libctest
+ptime -m cargo test --verbose --manifest-path libc-test/Cargo.toml
diff --git a/.github/buildomat/config.toml b/.github/buildomat/config.toml
new file mode 100644
index 0000000000000..55ba305e7566f
--- /dev/null
+++ b/.github/buildomat/config.toml
@@ -0,0 +1,7 @@
+# Configuration for buildomat. See
+# https://github.com/oxidecomputer/buildomat?tab=readme-ov-file#per-repository-configuration.
+
+enable = true
+# The buildomat jobs don't have access to any secrets, so it's okay for GitHub
+# users to create them.
+org_only = false
diff --git a/.github/buildomat/jobs/x86_64-unknown-illumos.sh b/.github/buildomat/jobs/x86_64-unknown-illumos.sh
new file mode 100644
index 0000000000000..846661a8e31dc
--- /dev/null
+++ b/.github/buildomat/jobs/x86_64-unknown-illumos.sh
@@ -0,0 +1,8 @@
+#!/bin/env bash
+#:
+#: name = "x86_64-unknown-illumos"
+#: variety = "basic"
+#: target = "helios-latest"
+#: rust_toolchain = "stable"
+
+exec .github/buildomat/build-and-test.sh illumos