the beams are basically setting on lower notched post. There are two screws visible at top 1/4 of beam attached to the two top post supporting the roof.
The bottom and top post are not connected with any fasteners, at least not visible.
Those fasteners on the double rim joist look like structural screws. Better fastening would be recommended (check for AHJ approval). I would have a problem with the lack of knee bracing to prevent lateral movement since the support posts for the roof are not continuous to the ground.