diff --git a/.gitignore b/.gitignore
index 1b6128f..31605da 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 .run/
+backend/.run/
diff --git a/backend/configs/config.yaml b/backend/configs/config.yaml
new file mode 100644
index 0000000..0358a87
--- /dev/null
+++ b/backend/configs/config.yaml
@@ -0,0 +1,9 @@
+server:
+  port: 8080
+
+database:
+  host: localhost
+  port: 3306
+  user: root
+  password: 123456
+  dbname: feedsystem
\ No newline at end of file
diff --git a/go.mod b/backend/go.mod
similarity index 100%
rename from go.mod
rename to backend/go.mod
diff --git a/go.sum b/backend/go.sum
similarity index 100%
rename from go.sum
rename to backend/go.sum
diff --git a/start.sh b/start.sh
index e7eb07e..d108ffe 100644
--- a/start.sh
+++ b/start.sh
@@ -4,15 +4,60 @@ set -eu
 ROOT_DIR="$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)"
 cd "$ROOT_DIR"
 
-RUN_DIR="$ROOT_DIR/.run"
-mkdir -p "$RUN_DIR"
+BACKEND_DIR="${BACKEND_DIR:-$ROOT_DIR/backend}"
+FRONTEND_DIR="${FRONTEND_DIR:-$ROOT_DIR/frontend}"
+RUN_DIR="${RUN_DIR:-$BACKEND_DIR/.run}"
 
-# Start Redis (optional).
+START_REDIS="${START_REDIS:-1}"
+START_BACKEND="${START_BACKEND:-1}"
+START_FRONTEND="${START_FRONTEND:-1}"
+
+# frontend:
+# - FRONTEND_INSTALL=auto|1|0 (default auto, only when node_modules missing)
+# - FRONTEND_SCRIPT=dev|preview|build (default dev)
+FRONTEND_INSTALL="${FRONTEND_INSTALL:-auto}"
+FRONTEND_SCRIPT="${FRONTEND_SCRIPT:-dev}"
+
+# redis:
 # - If you already run Redis elsewhere, this will detect it (when redis-cli exists) and skip.
 REDIS_HOST="${REDIS_HOST:-127.0.0.1}"
 REDIS_PORT="${REDIS_PORT:-6379}"
 REDIS_CONF="${REDIS_CONF:-}"
 
+require_dir() {
+  if [ ! -d "$2" ]; then
+    echo "[start.sh] $1 dir not found: $2"
+    exit 1
+  fi
+}
+
+require_cmd() {
+  if ! command -v "$1" >/dev/null 2>&1; then
+    echo "[start.sh] command not found: $1"
+    exit 1
+  fi
+}
+
+BACKEND_PID=""
+cleanup() {
+  if [ -n "${BACKEND_PID:-}" ]; then
+    echo "[start.sh] Stopping backend (pid=$BACKEND_PID)"
+    kill "$BACKEND_PID" >/dev/null 2>&1 || true
+  fi
+}
+trap cleanup INT TERM EXIT
+
+if [ "$START_BACKEND" = "1" ]; then
+  require_dir backend "$BACKEND_DIR"
+  mkdir -p "$RUN_DIR"
+  require_cmd go
+fi
+
+if [ "$START_FRONTEND" = "1" ]; then
+  require_dir frontend "$FRONTEND_DIR"
+  require_cmd npm
+fi
+
 start_redis() {
   if ! command -v redis-server >/dev/null 2>&1; then
     echo "[start.sh] redis-server not found; skip starting Redis"
@@ -35,7 +80,42 @@ start_redis() {
   echo $! >"$RUN_DIR/redis.pid"
 }
 
-start_redis
+start_backend_bg() {
+  echo "[start.sh] Starting backend (background)"
+  (cd "$BACKEND_DIR" && go run ./cmd) &
+  BACKEND_PID=$!
+  echo "$BACKEND_PID" >"$RUN_DIR/backend.pid"
+  echo "[start.sh] Backend PID: $BACKEND_PID"
+}
 
-echo "[start.sh] Starting app"
-go run ./cmd
+start_backend_fg() {
+  echo "[start.sh] Starting backend"
+  cd "$BACKEND_DIR"
+  go run ./cmd
+}
+
+start_frontend_fg() {
+  if [ "$FRONTEND_INSTALL" = "1" ] || { [ "$FRONTEND_INSTALL" = "auto" ] && [ ! -d "$FRONTEND_DIR/node_modules" ]; }; then
+    echo "[start.sh] Installing frontend deps"
+    (cd "$FRONTEND_DIR" && npm install)
+  fi
+
+  echo "[start.sh] Starting frontend (npm run $FRONTEND_SCRIPT)"
+  cd "$FRONTEND_DIR"
+  npm run "$FRONTEND_SCRIPT"
+}
+
+if [ "$START_REDIS" = "1" ] && [ "$START_BACKEND" = "1" ]; then
+  start_redis
+fi
+
+if [ "$START_BACKEND" = "1" ] && [ "$START_FRONTEND" = "1" ]; then
+  start_backend_bg
+  start_frontend_fg
+elif [ "$START_BACKEND" = "1" ]; then
+  start_backend_fg
+elif [ "$START_FRONTEND" = "1" ]; then
+  start_frontend_fg
+else
+  echo "[start.sh] Nothing to start. Set START_BACKEND=1 and/or START_FRONTEND=1."
+fi