diff --git a/.vscode/Dockerfile b/.vscode/Dockerfile
new file mode 100644
index 0000000..b83ced3
--- /dev/null
+++ b/.vscode/Dockerfile
@@ -0,0 +1,24 @@
+FROM mcr.microsoft.com/vscode/devcontainers/base:bullseye
+
+WORKDIR /opt
+
+# hadolint ignore=DL3008
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        ca-certificates \
+        curl && \
+    rm -rf /var/lib/apt/lists/*
+
+SHELL [ "/bin/bash", "-o", "pipefail", "-c" ]
+RUN curl -sSf https://rye-up.com/get | RYE_INSTALL_OPTION="--yes" bash && \
+    rye config --set-bool behavior.global-python=true && \
+    rye config --set-bool behavior.use-uv=true
+
+ENV RYE_HOME="/opt/rye"
+ENV PATH="$RYE_HOME/shims:$PATH"
+
+COPY ./.python-version ./pyproject.toml ./requirements* ./
+RUN rye pin "$(cat .python-version)" && \
+    rye sync
+
+RUN chown -R vscode $RYE_HOME
diff --git a/Fibonacci.py b/Fibonacci.py
new file mode 100644
index 0000000..8617013
--- /dev/null
+++ b/Fibonacci.py
@@ -0,0 +1,7 @@
+def Fib(n) -> int:  # noqa: N802, D103, ANN001
+    if n == 1:
+        return 0
+    elif n == 2:  # noqa: RET505, PLR2004
+        return 1
+    else:
+        return Fib(n - 1) + Fib(n - 2)