Developer to build a GRID trading EA

The mechanics for this strategy is the following:

The EA will always have both sides of positions open (short and long)

The TP will be based either on the balance or equity (input)

Once it hits TP to either side will reopen a new position with the initial lot size

Every time price hits the step level of an opposite direction the EA has to open a new position based on the martingale multiplier

Two multipliers will be needed. One for the second position, and the second one for the third on

The EA needs to calculate the commission fees and swap fees on the backtest

Inputs needed:

Size lot based on the balance percentage

Take profit based on the balance/equity

Second position multiplier input

A fixed multiplier for the rest of the positions 

Grid step based on a percentage of price or points

How will the multipliers work?

Let's say my second position multiplier is 2x and the rest will be 1.5x

So the lot sizes will be opened as 1.00, 2.00, 3.00, 4.50, 6.75, 10.13 respectively