Custom MT5 Expert Advisor: Full-Body Engulfing Scalper with ATR Risk & Optional Trailing Buffer

Tarea técnica

​I am looking for an experienced MQL5 developer to build a fully automated MetaTrader 5 Expert Advisor (EA) optimized primarily for XAUUSD (Gold), featuring a clean Tkinter-style telemetry dashboard control concept or customizable input parameters.
​1. Core Strategy Rules (Full-Body Engulfing)
​Signal Identification: The EA must scan completed candles across multiple selectable timeframes (e.g., 1M, 5M, 15M, 30M, 1H) using strict Full-Body Engulfing pattern logic:
​Bullish Engulfing: A bearish candle followed by a bullish candle where the current body entirely engulfs the previous body (curr_close >= prev_open and curr_open <= prev_close, with curr_body_size >= prev_body_size).
​Bearish Engulfing: A bullish candle followed by a bearish candle where the current body entirely engulfs the previous body (curr_close <= prev_open and curr_open >= prev_close, with curr_body_size >= prev_body_size).
​Execution Constraint: Must evaluate completed bars only (preventing repainting) on a bar-time progression trigger.
​2. Risk Management & Dynamic Trailing System
​ATR-Based Initial Entries: Initial Stop Loss (SL) and Take Profit (TP) distances must be dynamically calculated using Average True Range (ATR Period, ATR SL Multiplier, ATR TP Multiplier).
​Spread Filter: Must check market spread before opening positions and reject trades if the current spread exceeds the maximum allowed pips limit.
​Optional Trailing Buffer ($3 Step-Lock): Include a toggle option to enable/disable a dynamic trailing mechanism:
​When active, once the price reaches a 1:1 risk-to-reward ratio, the Stop Loss moves to break-even.
​Simultaneously, the fixed Take Profit is removed (TP = 0.0) to let the trade run open-ended.
​The Stop Loss then trails closely behind the favorable price action using a defined buffer step-lock to capture extended trends.
​3. Account Guardrails & Safety
​Max Concurrent Trades: Hard limit on simultaneous active trades per symbol.
​Session Guardrails: Monitors initial session balance against current equity, with automated circuit breakers for Max Drawdown percentage and Profit Target percentage thresholds.
​Deliverables Required:
​Clean, well-commented MQL5 source code file (.mq5).
​Compiled executable file (.ex5).
​Full integration of all specified input parameters and logic.

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