The generator matrix

 1  0  0  0  0  1  1  1  0  1  1  1  1  X  0
 0  1  0  0  0  0  0  0  0 X+1  1 X+1 X+1  1  X
 0  0  1  0  0  0  1  1  1  1  1 X+1  0 X+1  0
 0  0  0  1  0  1  1  0  1  0  1 X+1  X  X  X
 0  0  0  0  1  1  0  1  1 X+1  1  0  X  0  0
 0  0  0  0  0  X  0  0  0  X  X  0  0  0  X
 0  0  0  0  0  0  X  0  0  0  0  X  X  X  0
 0  0  0  0  0  0  0  X  0  0  X  X  0  X  0
 0  0  0  0  0  0  0  0  X  0  X  X  X  0  0

generates a code of length 15 over Z2[X]/(X^2) who´s minimum homogenous weight is 8.

Homogenous weight enumerator: w(x)=1x^0+273x^8+960x^10+2640x^12+4272x^14+4427x^16+2528x^18+1072x^20+176x^22+35x^24

The gray image is a linear code over GF(2) with n=30, k=14 and d=8.
As d=8 is an upper bound for linear (30,14,2)-codes, this code is optimal over Z2[X]/(X^2) for dimension 14.
This code was found by Heurico 1.16 in 2.76 seconds.