diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
new file mode 100644
index 00000000..01bea41a
--- /dev/null
+++ b/.devcontainer/devcontainer.json
@@ -0,0 +1,13 @@
+{
+  "name": "Simplicity C",
+  "image": "mcr.microsoft.com/devcontainers/cpp:1-ubuntu-24.04",
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "ms-vscode.cpptools",
+        "ms-vscode.makefile-tools"
+      ]
+    }
+  },
+  "postCreateCommand": "cd C && make"
+}
diff --git a/.devcontainer/nix/devcontainer.json b/.devcontainer/nix/devcontainer.json
new file mode 100644
index 00000000..05043420
--- /dev/null
+++ b/.devcontainer/nix/devcontainer.json
@@ -0,0 +1,19 @@
+{
+  "name": "Simplicity Nix",
+  "image": "mcr.microsoft.com/devcontainers/base:ubuntu-22.04",
+  "features": {
+    "ghcr.io/devcontainers/features/nix:1": {
+      "multiUser": false,
+      "extraNixConfig": "sandbox = false"
+    }
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "jnoortheen.nix-ide",
+        "mkhl.direnv"
+      ]
+    }
+  },
+  "postCreateCommand": "nix-shell --run 'echo Nix shell environment ready'"
+}
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 00000000..ce599159
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,8 @@
+# Force LF line endings for all text files (prevents CRLF issues in Nix builds)
+* text=auto eol=lf
+
+# Explicitly binary files
+*.png binary
+*.jpg binary
+*.pdf binary
+*.eps binary