diff --git a/frontend/app.py b/frontend/app.py
index e69de29..04b9c09 100644
--- a/frontend/app.py
+++ b/frontend/app.py
@@ -0,0 +1,49 @@
+import streamlit as st
+import sys
+from pathlib import Path
+
+# Add project root to Python path for imports
+sys.path.insert(0, str(Path(__file__).parent.parent))
+
+from frontend.sidebar import render_sidebar
+from frontend.editor import render_editor
+from frontend.chat import render_chat
+
+
+def init_state():
+    """Initialize session state variables."""
+    if "selected_file" not in st.session_state:
+        st.session_state.selected_file = None
+    if "file_content" not in st.session_state:
+        st.session_state.file_content = ""
+    if "chat_history" not in st.session_state:
+        st.session_state.chat_history = []
+    if "code_output" not in st.session_state:
+        st.session_state.code_output = ""
+
+
+def main():
+    st.set_page_config(
+        page_title="Lightweight code editor", 
+        layout="wide")
+    
+    st.title("Lightweight code editor")
+
+    init_state()
+
+    left, right = st.columns([1, 3])
+
+    with left:
+        choice = render_sidebar()
+    
+    with right:
+        if choice == "Chat with AI Assistant":
+            render_chat()
+        elif choice == "Code Editor":
+            render_editor()
+        elif choice == "File Explorer":
+            st.subheader("File Explorer")
+            st.info("File Explorer functionality is not implemented yet.")
+
+if __name__ == "__main__":
+    main()
diff --git a/frontend/chat.py b/frontend/chat.py
index e69de29..1a06046 100644
--- a/frontend/chat.py
+++ b/frontend/chat.py
@@ -0,0 +1,21 @@
+import streamlit as st
+
+def render_chat():
+    st.subheader("Chat with AI Assistant")
+    
+    if st.session_state.chat_history:
+        for message in st.session_state.chat_history:
+            st.markdown(f"**{message['role'].capitalize()}:** {message['content']}")
+    
+    user_input = st.text_input("Type your message here:", key="chat_input")
+    
+    if st.button("Send", key="send_button") and user_input:
+        st.session_state.chat_history.append({"role": "user", "content": user_input})
+        # Here you would typically call your AI assistant to get a response
+        # For demonstration, we'll just echo the user's message
+        ai_response = f"Echo: {user_input}"
+        st.session_state.chat_history.append({"role": "assistant", "content": ai_response})
+        st.session_state.chat_input = ""  # Clear input after sending
+
+if __name__ == "__main__":
+    render_chat()
\ No newline at end of file
diff --git a/frontend/editor.py b/frontend/editor.py
index e69de29..5020986 100644
--- a/frontend/editor.py
+++ b/frontend/editor.py
@@ -0,0 +1,17 @@
+import streamlit as st
+
+def render_editor():
+    st.subheader("Code Editor")
+    
+    if st.session_state.selected_file:
+        st.text_area(
+            "Edit your code here:",
+            value=st.session_state.file_content,
+            height=400,
+            key="code_editor"
+        )
+    else:
+        st.info("Please select a file to edit.")
+    
+if __name__ == "__main__":
+    render_editor()
\ No newline at end of file
diff --git a/frontend/sidebar.py b/frontend/sidebar.py
index e69de29..0c914a1 100644
--- a/frontend/sidebar.py
+++ b/frontend/sidebar.py
@@ -0,0 +1,13 @@
+import streamlit as st
+
+def render_sidebar():
+    st.sidebar.title("Navigation")
+    
+    options = ["Chat with AI Assistant", "Code Editor", "File Explorer"]
+    choice = st.sidebar.radio("Go to:", options)
+    
+    return choice
+
+if __name__ == "__main__":
+    render_sidebar()
+    
\ No newline at end of file
diff --git a/frontend/state.py b/frontend/state.py
new file mode 100644
index 0000000..a340bb5
--- /dev/null
+++ b/frontend/state.py
@@ -0,0 +1,20 @@
+import streamlit as st
+
+def init_state():
+    if "selected_file" not in st.session_state:
+        st.session_state.selected_file = None
+    
+    if "file_content" not in st.session_state:
+        st.session_state.file_content = ""
+    
+    if "is_editing" not in st.session_state:
+        st.session_state.is_editing = False
+    
+    if "chat_history" not in st.session_state:
+        st.session_state.chat_history = []
+    
+    if "code_suggestions" not in st.session_state:
+        st.session_state.code_suggestions = []
+    
+if __name__ == "__main__":
+    init_state()
\ No newline at end of file