Gadgeteer

Source: Compendium of Craft and Creation

Swinging from a grappling hook before dropping a smoke bomb, rigging a stubborn lock to blow, or rejiggering traps to spring on those that set them, the Gadgeteer lives by fast paced innovation and thinking outside the box on the fly... sometimes literally.
Specializing tools that let themselves get in and out of trouble, they don’t fight fair, relying on things that go "boom", "zap" or "whirr". They live on the edge of their own explosions, though often rewriting the story in later retellings that they doffed their darkened goggles as they walked away slowly, omitting the singed seat of their trousers and yelping.

Gadget DC

Your gadgets are a combination of innovative mechanical parts and magic. You use your Intelligence for gadget-based effects when they refer to a spell attack roll or spell save DC.

Gadget DC = 8 + your proficiency bonus + your Intelligence modifier
Gadget modifier = your proficiency bonus + your Intelligence modifier