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Polygon
Joist hangers would be fine, forget the dpm it always gathers moisture behind it, just give the end grain of the joists a good soaking in timber preservative. This does mean you would have to build a proper 9" retaining wall to support the decking. If the wall isn't retaining much, build a 4" (single brick) wall with posts inside, it is much easier. The posts don't go into the same foundation as the wall, just use a trenching shovel, dig them in 2' deep and ram 4:1 dry mix concrete around them with a broomstick or similar.