Scalping EA/straddle

Specification

Title: Custom EA: Dynamic Trailing Limit Grid with Volatility/Velocity Filter and Auto SL/TP
Description:
I am looking for an experienced MQL5 programmer to develop a high-performance, robust Expert Advisor (EA) for MetaTrader 5. The strategy relies on dynamic trailing limit orders that automatically adjust to market price changes, featuring a safety buffer during high-velocity price spikes.
The EA must include the following core mechanics:
  1. Dynamic Trailing Limit Orders
  • The EA must maintain one Buy Limit and one Sell Limit order at an equal distance (Points/Pips) from the current market price.
  • As the market price moves smoothly, the EA must continuously modify these pending orders to maintain the exact predefined distance.
  • To prevent broker server flooding, include a minimal price step threshold (e.g., only modify orders if the price shifts by 'X' points).
  1. Price Velocity / Abrupt Move Filter ("Slug")
  • The EA must track price velocity (tick-by-tick momentum or price change over a millisecond time delta).
  • If the price moves abruptly (exceeding a user-defined velocity threshold), the EA must instantly pause limit order modifications to allow a "slug" or execution buffer.
  • During an abrupt move, the EA should either freeze the pending limits, widen them temporarily, or allow the price to run past them to avoid getting caught in toxic slip/bad fills.
  1. Automatic Protection (SL & TP)
  • The moment a pending Buy Limit or Sell Limit order is triggered and turns into an active position, the EA must immediately apply a hardcoded Stop Loss (SL) and Take Profit (TP) to the order on the broker's server.
Developer Requirements:
  • Deep experience with asynchronous order management ( OrderSendAsync ) and high-frequency order modification loops in MQL5.
  • Strong understanding of execution latency, slippage prevention, and handling broker error codes (e.g., re-quotes, context busy).
  • Clean, commented code structure with an optimized event handling mechanism ( OnTick or OnTimer ).
Please provide examples of previous grid/trailing order systems you have coded when applying. 

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Project information

Budget
30 - 200 USD