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who specializes in computers.

In most cases, since I install and maintain point of sale systems, store computers and printers, and service scales, I just say that I'm a computer tech in grocery stores. For most people, this is sufficient. If they want me to get specific, I tell them I work on the registers, store PCs, and "the scales in the deli."

They usually understand that.

Edit: spelling

I get paid to play with all the cool toys.

If people want more, I tell them I am to blame for the network, servers, security, training, hardware and software at work.

Then after the deer in headlights look fades, "I am responsible for anything computer related."

They "get" that last one.

Field Service Engineer. I have to service everything from Satelite earth stations to PC's. and anything that hooks to them. Point of sale and order entry equipment in resturants to refineries. Key storage systems at car dealers or rewinders of aluminum wire at the manufactures
plant. Infra-red scanning of hydroelectric generators at dams, coking plants, boilers and personal homes. Repair of servos, proximity detectors and strain gauges at nuclear plants is my favorite as it involves a lot of prep time and usually very little work and only happens once a year due to exposure limitations. Travel, usually in excess of 100K miles a year in personal, rent-a-car and borrowed company vehicles makes for a TYPE A personality that I'm able to turn off and on depending on the attitude of the customer and the traffic.

Unlike you.
Service 180 nurses by yourself !
What a job, you need help, I have an excellent candidate lined up.
I usually describe myself as a programmer, makes it easier for the boss, they've some vague notion of what that entails.