diff --git a/.bazelrc b/.bazelrc
index 82be45bc..558b781e 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -1,3 +1,4 @@
+build --enable_platform_specific_config
 # Options common for all EngFlow remote configurations.
 build:engflow_common --jobs=8
 build:engflow_common --define=EXECUTOR=remote
@@ -17,6 +18,11 @@ build:engflow_common --platforms=//remote_config/config:platform
 build:engflow_common --java_runtime_version=remotejdk_11
 build:engflow_common --java_language_version=11
 
+build:macos --host_platform @io_bazel_rules_dotnet//dotnet/toolchain:darwin_amd64_3.1.100
+build:macos --platforms @io_bazel_rules_dotnet//dotnet/toolchain:darwin_amd64_3.1.100
+build:linux --host_platform @io_bazel_rules_dotnet//dotnet/toolchain:linux_amd64_3.1.100
+build:linux --platforms @io_bazel_rules_dotnet//dotnet/toolchain:linux_amd64_3.1.100
+
 build:without_bytes --experimental_remote_download_outputs=minimal
 
 # Options for a private EngFlow cluster.
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 00c64e53..119ff14e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -51,3 +51,6 @@ jobs:
       run: |
         bazel build //typescript/...
         bazel test //typescript/...
+
+    - name: Building //csharp directory
+      run: bazel build //csharp/...
diff --git a/WORKSPACE b/WORKSPACE
index 03305a90..016fb9b0 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -203,3 +203,20 @@ nodejs_register_toolchains(
 load("@bazel_skylib//:workspace.bzl", "bazel_skylib_workspace")
 
 bazel_skylib_workspace()
+
+http_archive(
+    name = "io_bazel_rules_dotnet",
+    sha256 = "400416de5d5d321fa7ca9e46110373cd39db7ed84ef3a61e1150c5813cb1c99e",
+    strip_prefix = "rules_dotnet-0.0.7",
+    urls = ["https://github.com/bazelbuild/rules_dotnet/archive/refs/tags/0.0.7.zip"],
+)
+
+load("@io_bazel_rules_dotnet//dotnet:deps.bzl", "dotnet_repositories")
+
+dotnet_repositories()
+
+load("@io_bazel_rules_dotnet//dotnet:defs.bzl", "dotnet_register_toolchains", "dotnet_repositories_nugets")
+
+dotnet_register_toolchains()
+
+dotnet_repositories_nugets()
diff --git a/csharp/BUILD b/csharp/BUILD
new file mode 100644
index 00000000..1a43aedd
--- /dev/null
+++ b/csharp/BUILD
@@ -0,0 +1,11 @@
+load("@io_bazel_rules_dotnet//dotnet:defs.bzl", "csharp_binary")
+
+csharp_binary(
+    name = "csharp.exe",
+    srcs = [
+        "Main.cs",
+    ],
+    deps = [
+        "@core_sdk_stdlib//:libraryset",
+    ],
+)
diff --git a/csharp/Main.cs b/csharp/Main.cs
new file mode 100644
index 00000000..e581983e
--- /dev/null
+++ b/csharp/Main.cs
@@ -0,0 +1,11 @@
+using System;
+
+namespace HelloWorld
+{
+    class Hello {
+        static void Main(string[] args)
+        {
+            System.Console.WriteLine("Hello World!");
+        }
+    }
+}