You have to understand that these writing companies, specially those that pose as niche specific companies are usually scam artists of the highest degree. They do not have actual nurses writing the papers for their students and they do not have any intention of delivering a well developed nursing paper for the client either.
This is true. There are no essay companies whose writers are all "unemployed professors" or "nurses" or "lawyers." That's nothing but a deceitful marketing tactic.
Your best bet would be to find an independent writer who has a nursing background and has the ability to actually turn in these quality papers while also attending to his regular job as a nurse.
In my experience, this is something that simply doesn't exist. As I've mentioned before, in my 25 years of writing academic projects for a living, I've had more nursing clients than students in any other field, and I recently posted a photo of a stack of nursing textbooks representing roughly half of my hard-copy sources. While I don't keep a precise count, I've definitely written more than 1,000 nursing projects for several hundred nursing clients, including everything from 100-pg PhD dissertations for Nurse-Practitioner degree candidates to those dopey series of 150-word class-forum posts and responses to classmates' related posts, which means that, in addition to exposure to the writing abilities of my clients, I've also become quite familiar with the writing abilities and styles of a dozen or more classmates of each nursing client for whom I've written those series of class-forum posts. In fact, their relative inability to write (and/or interpret and comment meaningfully on the assigned articles for those forum assignments) was shocking to me, at first. One of my very first clients (in 1999) was a gym friend who was entirely unable to write any of his own projects in nursing school. He'd never have been able to graduate, otherwise; however, he's now a very respected senior nurse supervisor with a successful 20-year career in the field, thereby (also) proving that there's no correlation between nursing writing assignments and the actual practice of nursing. By far, I've also had many more nurses refer their friends and colleagues to me than clients in any other field, to the extent that I've produced as many as three different versions of the exact same assignment and deadline for three clients all taking the same course together; and at least two of my nursing clients eventually referred their daughters to me for work, roughly a decade after they received their own degrees. If there were such a thing as nurses writing nursing papers for hire, they'd never have become so reliant on and loyal to me, as clients.
In my experience, most nursing-degree candidates don't write very well, at all; and those who might write well are already working grueling shifts that (at least) do pay very well. The last thing that any practicing nurses need to do is take on more of the same writing projects that they (typically) hated having to do for their own degrees, for the comparative pittance that they'd earn per hour writing essays in their free time. If they ever need the extra money, they simply pick up an extra 4-hour or 8-hour or 12-hour shift for much more money than they'd earn working on someone else's academic essay for 2x or 3x or 4x the amount of time investment and less money. Additionally, a very substantial percentage of my nursing clients have always been ESL students who could never have written any of the projects required of them by their nursing programs. Meanwhile, most of the assigned topics (or topic choices) of those required projects are entirely irrelevant to their learning the substantive concepts and clinical skills that actually correspond to being a good nurse. I suppose it's possible that there might be nurses who are good writers and who aren't currently working as nurses, but I doubt that they'd be writing nursing papers for work, except (perhaps) the occasional project for close friends; and I highly doubt that any of them advertises and/or could be found by -- or would be interested in taking work from -- any nursing students they don't already know, personally.