Mechanic

Mechanics love devices, particularly magical devices.  While many do not make their own gear, they do excel at using and repairing other's devices.

Snap Shot

Starting at 3rd level, you can use the bonus action granted by your Cunning Action to make an attack using a hand crossbow.  This action requires it to already be in your hand, but does include one loading.  You can do this a no more than your Dex bonus times before you take a long rest.

Mechanical Advantage

When you investigate or alter (disarm) mechanical devices you have advantage.  This does not magical traps or alarms.

Attunement Expertise

Starting at 9th level, you can attune one additional four magical items, not three.   In addition, attunement takes one action, rather than a short rest.

 

Thief's Use Magic Device

Once you obtain 13th level, you have learned enough about the workings of magic that you can improvise the use of items even when they are not intended for you. You ignore all class, race, and level requirements on the use of magic items.

Mechanic's Reflexes

When you reach 17th level, you have become adept at using charged magic items.  You can do so as a bonus action and when you do so you have advantage on any roll to avoid destroying them upon use.  I.E.  If you have a Wand of Web and expend it's last charge, you roll two d20 and the wand only crumbles into ash if both are natural 1.