That is a millipede. They are beneficial decomposer insects outdoors but sometimes get in, especially during rainy times. They do not bite and usually die fairly quickly from drying out. You don't need an exterminator, but someone to tighten up/seal the areas where they are entering. They can be swept up or vacuumed when dry.

Here is our page about them:
https://extension.umd.edu/hgic/topics/millipedes


Christine