I am a computational chemist so... Not sure how you would translate that so that someone from the 1700s would understand but whatever it is would get me burned as a witch.

Yes.

Someone else makes a complicated tools for teeth doctors to record what they do and helps them keep track of how much money they are owed.

I teach people to use that tool, and fix it when it breaks. Usually both because I'll try to explain how to do something and realize it's broken half way through

Books

I'm a math nerd at the head of a math department for a big company. Pretty sure they still stoned math nerds to death then so I'd lie.

I make machines talk to each other so that people can talk to each other through the machines from really far away. Like, you know that brand new thing called the telegraph? Well now we call those optical telegraphs because ours are made of pieces of lightning called electricity, and I work on even better versions of that. You can talk to anyone you know instantly with the machines I work on, no matter where in the world they are.

I direct a controlled form of lightning down metal wires to power electric candles, and other amazing devices.

I'm an artist, so probably. I do traditional painting, something they'd get immediately, but my digital stuff would be difficult to explain. They'd probably think my subject matter is weird, but they'd certainly be able to identify my work as art.

They probably wouldn't understand what a software engineer is. I would explain to them that we have mechanical devices that are so complex that humans have to write instructions on how it behaves. That's probably not enough, but would be enough for them to ask clarifying questions.

I work with a number of shops (all belonging to one family) to try to make sure that we send enough stock from the company's warehouse to them.

Yeah I'd say that's a simple one .

We're not all physicist. I coordinate the movement of goods from one county to the other.

I solve problems related to how lightning rocks talk to each other. Often there's an issue with how automatic scribes decide they don't feel like talking. Some days I must travel more than double the speed of your fastest horse using a metal box with wheels. I will often complain when my metal box picks the wrong music to play.

in 1730 they invented magazines, pretty much most tech and communications jobs are based off of that

I'm just going to call myself an artist of new media types and end it there.

That's a challenge.

The job I do didn't exist when I was in high school, and most of the technology it was built on didn't exist until the early 1900s.

I suppose I could just call myself a general repairman and leave it at that.

People who try to work together fail to do it well, so I help them understand why this happens, so that they can do better.

I'd have to go through a bunch of concepts about light, moving motion and photography in general but I'm sure we'd get there eventually.