People have given you good info here! Yay!
Here I was in the apartment, playing around with a piece of fabric tied in a backcarry, when DS was...3 months old.
Weird, I can't find my back-carry-with-Korean-podegi picture, oh well!
Point is, in those traditional carriers there are many ways for a secure back-carry.
Now, I coudln't put him on my back for anything until he was old enough to stand behind me and climb up. Pregnancy just devastated my joints, and I couldn't move my arms in the right way to get him up there or even do the hip scoot move. So I always had to have someone there with me to put him up and hold him up while I tied it.
But as you can see in my avatar, I kept DS in a front, facing-me carry for a good long time! He's about 1 year 4 months at
Disneyland in my avatar picture.

He always enjoyed interacting with people behind me, and they liked it that I coudln't see the silly faces they were making.
If your joints aren't as bad as mine...mamatoto.org has good instructions for ties and getting baby up there, and I'm sure thebabywearer.com (or something like that?) has good info too!
Oh, while my mei tai wasn't solarveil, I'm sure the mesh idea is about the same...my mei tai isn't padded in the shoulders. And if your babe is on the heavier side, if your shoulder straps aren't padded either, watch out for the skin below your shoulders and in front of your armpits! Once I started backcarries with that mei tai, I got broken blood vessels there (AKA hickeys) from the upadded straps...for a future mei tai even if it's solarveil, I'd get lightly padded straps.