Back when The Mandalorian debuted on Disney+, fans of Star Wars: The Old Republic began their own speculation as to "what spec" he would be. Since the show had no reason to follow the stipulations of the MMO, this was bound to stay a little in-joke of the community; that is, until Season 2 Episode 11: The Heiress removed any doubt. Din Djarin was an Shield Tech Powertech.
Or, at least the closest to it! The ST-PT, whose shorthand appropriately sounds like some kind of Star Wars walker, is the Tank discipline, focusing on passive damage reduction, of the Powertech advanced class (the way Din 'tanked' the Stormtrooper fire in that corridor removed all doubt, and all his gadget use rules out Mercenary) and is mirrored by the Shield Specialist Vanguard on the Republic side.
Here's our guide on how to master your very own Mando in SWTOR.
Introduction
It's long past time for BioWare to give Bounty Hunters the ability to wield weapons other than blaster pistols, since it's likely a stretch that a raid boss will look at a party of players and consider the guy with the dinky little weapon the greatest threat - but we digress.
Unlike the two DPS disciplines of the Powertech, Shield Tech focuses on a balanced blend of passive and active damage reduction with a focus on the former, alongside threat generation (obviously). As far as the game's tank disciplines go, Shield Tech offers competitive quantities of damage output and decent crowd control abilities, so it is more viable for solo play and leveling than most others in the category.
A key aspect of the Shield Tech compared to other classes is the shoulder cannon, the related abilities of which are off the global cooldown. Slotting this into your rotations is a great way of increasing your actions-per-minute and maintaining consistent threat even though the spec won't be heavy on alacrity. The spec also has more crowd control options than the average tank and fares pretty well in terms of mobility.

