diff --git a/oss-internship-2020/jsonnet/examples/jsonnet_base_transaction.cc b/oss-internship-2020/jsonnet/examples/jsonnet_base_transaction.cc
new file mode 100644
index 0000000..d1ae7b1
--- /dev/null
+++ b/oss-internship-2020/jsonnet/examples/jsonnet_base_transaction.cc
@@ -0,0 +1,14 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
diff --git a/oss-internship-2020/jsonnet/examples/jsonnet_base_transaction.h b/oss-internship-2020/jsonnet/examples/jsonnet_base_transaction.h
new file mode 100644
index 0000000..bc0bb24
--- /dev/null
+++ b/oss-internship-2020/jsonnet/examples/jsonnet_base_transaction.h
@@ -0,0 +1,51 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <syscall.h>
+#include <libgen.h>
+
+#include "sandboxed_api/transaction.h"
+#include "sandboxed_api/vars.h"
+
+#include "jsonnet_sapi.sapi.h"
+
+class JsonnetSapiTransactionSandbox : public JsonnetSandbox {
+ public:
+  explicit JsonnetSapiTransactionSandbox(std::string in_file, std::string out_file)
+      : in_file_(std::move(in_file)), out_file_(std::move(out_file)) {}
+
+  std::unique_ptr<sandbox2::Policy> ModifyPolicy(
+      sandbox2::PolicyBuilder *) override {
+    return sandbox2::PolicyBuilder()
+        .AllowStaticStartup()
+        .AllowOpen()
+        .AllowRead()
+        .AllowWrite()
+        .AllowStat()
+        .AllowSystemMalloc()
+        .AllowExit()
+        .AllowSyscalls({
+            __NR_futex,
+            __NR_close,
+        })
+        .AddDirectoryAt(dirname(&out_file_[0]), "/output", /*is_ro=*/false)
+        .AddDirectoryAt(dirname(&in_file_[0]), "/input", true)
+        .BuildOrDie();
+  }
+
+ private:
+  std::string in_file_;
+  std::string out_file_;
+};
+