Look into tusk tenons or soffit tenons for connectors.

I often let just the lower portion of a joist into the carrying beam and leave joist as much above. If the joist were 12" deep you could let it into the beam 5" and have 7 hanging above. Kind of lodged but not. Still just simple drop in pockets with one or two with the tusk tenon. A little more to do when assembling but it give it a clear chance to hold things. Dove tails shrink and distort and stress the wood if you wedge them tight.

You could also put some metal strapping over the tops to tie the works together.