diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
new file mode 100644
index 0000000..605d950
--- /dev/null
+++ b/.devcontainer/Dockerfile
@@ -0,0 +1,22 @@
+FROM mcr.microsoft.com/devcontainers/base:ubuntu-24.04
+
+USER root
+RUN curl -fsSL https://deb.nodesource.com/setup_lts.x | bash - && \
+    apt-get install -y nodejs
+
+USER vscode
+
+RUN npm config set prefix /home/vscode/.npm-global
+ENV PATH="/home/vscode/.npm-global/bin:/home/vscode/.local/bin:$PATH"
+
+RUN curl https://mise.run | sh
+
+RUN /home/vscode/.local/bin/mise install elixir@latest erlang@latest && \
+    /home/vscode/.local/bin/mise use --global elixir@latest erlang@latest
+
+RUN /home/vscode/.local/bin/mise exec -- mix local.hex --force && \
+    /home/vscode/.local/bin/mise exec -- mix local.rebar --force
+
+RUN npm install -g @mariozechner/pi-coding-agent
+
+USER root
diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index e7d5451..731e74b 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -1,10 +1,11 @@
 {
     "$schema": "https://containers.dev/implementors/json_schema/",
-    "image": "mcr.microsoft.com/devcontainers/base:ubuntu-24.04",
+    "build": {
+        "dockerfile": "Dockerfile"
+    },
     "remoteUser": "vscode",
     "runArgs": [],
     "features": {
-        "ghcr.io/devcontainers/features/node:1": {},
         "ghcr.io/devcontainers/features/python:1": {},
         "ghcr.io/jsburckhardt/devcontainer-features/uv:1": {},
         "ghcr.io/jsburckhardt/devcontainer-features/ruff:1": {}
@@ -16,9 +17,8 @@
         "source=${localEnv:HOME}/.pi/agent/bin,target=/home/vscode/.pi/agent/bin,type=bind,consistency=cached"
     ],
     "postCreateCommand": {
-      "pi-agent": "bash -ic 'npm install -g @mariozechner/pi-coding-agent && pi install npm:pi-subagents'"
+        "pi-subagents": "bash -ic 'pi install npm:pi-subagents'"
     },
-
     "customizations": {
         "jetbrains": {
             "settings": {
@@ -31,7 +31,8 @@
             },
             "extensions": [
                 "ms-python.python",
-                "ms-toolsai.jupyter"
+                "ms-toolsai.jupyter",
+                "jakebecker.elixir-ls"
             ]
         }
     }