What you're probably looking for is some kind of research assistant or lab technician position. In my experience these are rarely advertised. Often they come about as an undergraduate student starts out volunteering in a lab, and then develops some expertise at a particular task. The PI might then hire that student on for a year or so after they graduate if they need someone to keep turning the crank, and for whatever reason a grad student or post-doc isn't a better choice to do it. It can also help if you have some experience or skills at writing code.
It's difficult to find these positions as an outsider. They often come through word of mouth. So you often need to have a foot in the door. One thing you might consider, is asking around at your undergraduate school. Talk with your professors and see if they know of anyone who's looking to hire. Another option to follow up with is if your school has any kind of hub that helps researchers translate from "cool science idea" to "small business startup." Sometimes getting in touch with these groups can help you get your foot in the door with such endeavors as they begin. If you're not already a researcher, you might end up doing a lot more work on the business side of things at first, but it's something.
In my field, medical physics, we will often hire medical physics assistants to help out with basic QA work. Often the minimum requirement for these positions in a BSc in physics. It's often a good way to stay connected to the field while you figure out what your next step is going to be.