diff --git a/backend/app/strategy/indicators.py b/backend/app/strategy/indicators.py
new file mode 100644
index 0000000..bf22e2d
--- /dev/null
+++ b/backend/app/strategy/indicators.py
@@ -0,0 +1,158 @@
+"""
+Technical Indicators
+
+보조지표 계산 함수들
+"""
+from typing import List, Optional, Tuple
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+def sma(prices: List[float], period: int) -> Optional[float]:
+    """단순 이동평균 (Simple Moving Average)"""
+    if len(prices) < period:
+        return None
+    return sum(prices[-period:]) / period
+
+
+def ema(prices: List[float], period: int, prev_ema: Optional[float] = None) -> Optional[float]:
+    """지수 이동평균 (Exponential Moving Average)"""
+    if len(prices) < period:
+        return None
+    
+    k = 2 / (period + 1)
+    if prev_ema is None:
+        # 초기값은 SMA
+        prev_ema = sum(prices[-period:]) / period
+    
+    return prices[-1] * k + prev_ema * (1 - k)
+
+
+def rsi(prices: List[float], period: int = 14) -> Optional[float]:
+    """
+RSI (Relative Strength Index)
+    
+    Args:
+        prices: 종가 리스트
+        period: 기간 (기본 14)
+    
+    Returns:
+        0~100 사이 RSI 값
+    """
+    if len(prices) < period + 1:
+        return None
+    
+    gains, losses = [], []
+    for i in range(-period, 0):
+        delta = prices[i] - prices[i - 1]
+        gains.append(max(delta, 0))
+        losses.append(max(-delta, 0))
+    
+    avg_gain = sum(gains) / period
+    avg_loss = sum(losses) / period
+    
+    if avg_loss == 0:
+        return 100.0
+    
+    rs = avg_gain / avg_loss
+    return 100 - (100 / (1 + rs))
+
+
+def bollinger_bands(prices: List[float], period: int = 20, std_mult: float = 2.0) -> Optional[Tuple[float, float, float]]:
+    """
+    볼린저 밴드
+    
+    Returns:
+        (upper, middle, lower) 또는 None
+    """
+    if len(prices) < period:
+        return None
+    
+    window = prices[-period:]
+    middle = sum(window) / period
+    variance = sum((p - middle) ** 2 for p in window) / period
+    std = variance ** 0.5
+    
+    upper = middle + std_mult * std
+    lower = middle - std_mult * std
+    
+    return (upper, middle, lower)
+
+
+def macd(prices: List[float], fast: int = 12, slow: int = 26, signal: int = 9) -> Optional[Tuple[float, float, float]]:
+    """
+    MACD (Moving Average Convergence Divergence)
+    
+    Returns:
+        (macd_line, signal_line, histogram) 또는 None
+    """
+    if len(prices) < slow:
+        return None
+    
+    # EMA 계산 (재귀적으로 계산)
+    def calc_ema(data: List[float], period: int) -> float:
+        k = 2 / (period + 1)
+        ema_val = sum(data[:period]) / period
+        for p in data[period:]:
+            ema_val = p * k + ema_val * (1 - k)
+        return ema_val
+    
+    ema_fast = calc_ema(prices, fast)
+    ema_slow = calc_ema(prices, slow)
+    macd_line = ema_fast - ema_slow
+    
+    # Signal line = MACD의 EMA(9)
+    # 실제로는 과거 MACD 값들 필요 (간략화)
+    signal_line = macd_line  # TODO: 정확한 구현 필요
+    histogram = macd_line - signal_line
+    
+    return (macd_line, signal_line, histogram)
+
+
+def atr(highs: List[float], lows: List[float], closes: List[float], period: int = 14) -> Optional[float]:
+    """
+    ATR (Average True Range)
+    
+    Args:
+        highs: 고가 리스트
+        lows: 저가 리스트
+        closes: 종가 리스트
+        period: 기간
+    
+    Returns:
+        ATR 값
+    """
+    if len(highs) < period + 1 or len(lows) < period + 1 or len(closes) < period + 1:
+        return None
+    
+    trs = []
+    for i in range(1, len(highs)):
+        h = highs[i]
+        l = lows[i]
+        cp = closes[i - 1]
+        tr = max(h - l, abs(h - cp), abs(l - cp))
+        trs.append(tr)
+    
+    if len(trs) < period:
+        return None
+    
+    return sum(trs[-period:]) / period
+
+
+def vwap(prices: List[float], volumes: List[float]) -> Optional[float]:
+    """
+    VWAP (Volume Weighted Average Price)
+    
+    Returns:
+        VWAP 값
+    """
+    if len(prices) != len(volumes) or not prices:
+        return None
+    
+    total_volume = sum(volumes)
+    if total_volume == 0:
+        return None
+    
+    total_pv = sum(p * v for p, v in zip(prices, volumes))
+    return total_pv / total_volume
diff --git a/backend/app/strategy/strategies/__init__.py b/backend/app/strategy/strategies/__init__.py
new file mode 100644
index 0000000..8a06e69
--- /dev/null
+++ b/backend/app/strategy/strategies/__init__.py
@@ -0,0 +1,11 @@
+"""
+Trading Strategies
+
+구체적인 매매 전략 구현체
+"""
+
+from app.strategy.strategies.day_trading import DayTradingStrategy
+
+__all__ = [
+    "DayTradingStrategy",
+]
diff --git a/backend/app/strategy/strategies/day_trading.py b/backend/app/strategy/strategies/day_trading.py
new file mode 100644
index 0000000..d40b42a
--- /dev/null
+++ b/backend/app/strategy/strategies/day_trading.py
@@ -0,0 +1,181 @@
+"""
+Day Trading Strategy (Refactored)
+
+기존 day_trading_strategy.py를 BaseStrategy 구조로 변환
+
+전략:
+  - ORB (Opening Range Breakout)
+  - VWAP Bounce
+  - RSI+BB 과매도 반등
+"""
+import logging
+from typing import Optional, Dict, Any
+from datetime import datetime, time
+import pytz
+
+from app.strategy.base_strategy import BaseStrategy
+from app.strategy.signal import Signal, SignalType
+from app.core.config import settings
+
+logger = logging.getLogger(__name__)
+
+
+class DayTradingStrategy(BaseStrategy):
+    """
+    데이트레이딩 전략 (단기 스칼핑)
+    
+    09:00~15:20 간 급등/급락 모멘텀 포착
+    """
+    
+    DEFAULT_CONFIG = {
+        "max_positions": 3,
+        "max_capital_ratio": 0.1,  # 종목당 10%
+        "orb_breakout_margin": 0.002,  # 0.2% 돌파
+        "stop_loss_pct": 0.025,  # -2.5%
+        "entry_cutoff": "14:30",  # 신규 진입 마감
+        "eod_flat": "15:20",  # EOD 청산
+    }
+    
+    def __init__(self, name: str = "DayTrading", config: Optional[Dict[str, Any]] = None):
+        merged_config = {**self.DEFAULT_CONFIG, **(config or {})}
+        super().__init__(name, merged_config)
+        
+        self.kst = pytz.timezone("Asia/Seoul")
+        self.entry_cutoff = self._parse_time(self.config["entry_cutoff"])
+        self.eod_flat = self._parse_time(self.config["eod_flat"])
+    
+    def _parse_time(self, time_str: str) -> time:
+        """문자열 "HH:MM" → time 객체"""
+        h, m = map(int, time_str.split(":"))
+        return time(h, m)
+    
+    async def analyze(
+        self,
+        stock_code: str,
+        market_data: Dict[str, Any],
+        portfolio_data: Optional[Dict[str, Any]] = None
+    ) -> Optional[Signal]:
+        """
+        시장 데이터 분석
+        
+        Args:
+            market_data: {
+                "current_price": float,
+                "minute_chart": List[dict],  # 1분봉
+                "orderbook": dict,
+                "stock_name": str,
+            }
+            portfolio_data: {
+                "holding_quantity": int,
+                "avg_price": float,
+            }
+        """
+        current_time = datetime.now(self.kst).time()
+        
+        # 1. 시간 체크
+        if current_time >= self.eod_flat:
+            # EOD 청산 신호
+            if portfolio_data and portfolio_data.get("holding_quantity", 0) > 0:
+                return Signal(
+                    stock_code=stock_code,
+                    signal_type=SignalType.SELL,
+                    strategy_name=self.name,
+                    timestamp=datetime.now(self.kst),
+                    quantity=portfolio_data["holding_quantity"],
+                    price=None,  # 시장가
+                    confidence=1.0,
+                    reason="EOD 강제 청산"
+                )
+            return None
+        
+        if current_time >= self.entry_cutoff:
+            # 신규 진입 차단
+            return None
+        
+        # 2. 현재 보유 중이면 청산 조건 체크
+        if portfolio_data and portfolio_data.get("holding_quantity", 0) > 0:
+            exit_signal = self._check_exit(
+                stock_code,
+                market_data,
+                portfolio_data
+            )
+            if exit_signal:
+                return exit_signal
+            return None  # 보유 유지
+        
+        # 3. 신규 진입 검토
+        return self._check_entry(stock_code, market_data)
+    
+    def _check_entry(self, stock_code: str, market_data: Dict[str, Any]) -> Optional[Signal]:
+        """신규 진입 신호 체크"""
+        current_price = market_data.get("current_price")
+        minute_chart = market_data.get("minute_chart", [])
+        
+        if not current_price or not minute_chart:
+            return None
+        
+        # 예시: ORB 전략 (간단화)
+        # 실제는 기존 check_orb_signal() 등을 호출
+        
+        # 임시 구현: 단순 예시
+        if len(minute_chart) >= 30:  # 09:00~09:30 데이터 있음
+            orb_high = max(c.get("high", 0) for c in minute_chart[:30])
+            
+            if current_price > orb_high * (1 + self.config["orb_breakout_margin"]):
+                stop_loss = current_price * (1 - self.config["stop_loss_pct"])
+                target = current_price * 1.03  # +3% 목표
+                
+                return Signal(
+                    stock_code=stock_code,
+                    signal_type=SignalType.BUY,
+                    strategy_name=self.name,
+                    timestamp=datetime.now(self.kst),
+                    quantity=None,  # OrderManager가 계산
+                    price=current_price,
+                    confidence=0.75,
+                    stop_loss_price=stop_loss,
+                    take_profit_price=target,
+                    reason=f"ORB 돌파: {orb_high:.0f} → {current_price:.0f}",
+                    metadata={"strategy_type": "ORB"}
+                )
+        
+        return None
+    
+    def _check_exit(self, stock_code: str, market_data: Dict[str, Any], portfolio_data: Dict[str, Any]) -> Optional[Signal]:
+        """청산 신호 체크"""
+        current_price = market_data.get("current_price")
+        avg_price = portfolio_data.get("avg_price")
+        quantity = portfolio_data.get("holding_quantity")
+        
+        if not current_price or not avg_price or not quantity:
+            return None
+        
+        # 손절 체크
+        stop_loss = avg_price * (1 - self.config["stop_loss_pct"])
+        if current_price <= stop_loss:
+            return Signal(
+                stock_code=stock_code,
+                signal_type=SignalType.STOP_LOSS,
+                strategy_name=self.name,
+                timestamp=datetime.now(self.kst),
+                quantity=quantity,
+                price=None,  # 시장가
+                confidence=1.0,
+                reason=f"손절: {current_price:.0f} ≤ {stop_loss:.0f}"
+            )
+        
+        # 익절 체크
+        target = avg_price * 1.03
+        if current_price >= target:
+            return Signal(
+                stock_code=stock_code,
+                signal_type=SignalType.TAKE_PROFIT,
+                strategy_name=self.name,
+                timestamp=datetime.now(self.kst),
+                quantity=quantity,
+                price=None,
+                confidence=1.0,
+                reason=f"목표가 도달: {current_price:.0f} ≥ {target:.0f}"
+            )
+        
+        return None