I’m looking for an MQL4 developer to create an Expert Advisor that automatically closes every open market position—buy or sell—whenever price crosses the Bollinger Bands Basis line in either direction. Key points • Platform: MetaTrader 4. • Scope: act on ALL symbols, regardless of chart or timeframe the trade was opened from. • Trigger: the instant the price crosses the Basis band (middle line) up or down, the EA must send a close command for the relevant ticket(s). • Exclusions: leave every pending order untouched. I’d like the usual user-friendly inputs—period, deviation, shift—plus a magic-number filter to avoid clashes with other EAs. The deliverable is a compiled .ex4 file with the editable .mq4 source, ready for testing on my side. Please code efficiently, handle errors (e.g., trade context busy), and include basic logging so I can verify actions in the Experts tab.