Custom cut and fit the lower one to fit the space.
Rip the 2X material to fit your needed requirements.
The rear joist will be tapered to fit the paver slope, and the sides will be 2 different heights, with the face joist being tapered to fit the outer edge.
allow the thickness of your floor boards in the cuts.
This will give you a level lower landing, then build your upper landing to the height for a comfortable step.
ED
Rip the 2X material to fit your needed requirements.
The rear joist will be tapered to fit the paver slope, and the sides will be 2 different heights, with the face joist being tapered to fit the outer edge.
allow the thickness of your floor boards in the cuts.
This will give you a level lower landing, then build your upper landing to the height for a comfortable step.
ED