Though I haven't previously written anything for pay, I am an extremely capable writer with strong skills in all types of writing except poetry.
In March 2022, I self-published a 568-page novel which was truly a one-man production: serving as my own proofreader and editor, I am solely responsible for the entire finished manuscript, and for the formatting/typesetting as well (which I performed using LaTeX). Excerpts from the novel can be found on its website: https://revolutionnovel.com. All the content of this website was written by me, too.
I also excel at a completely different type of writing in my "day job" as a software engineer, where I'm well known for my thorough, straightforward descriptions of complex ideas and my clear-eyed analysis of thorny issues.
If you require any further evidence of my abilities, I am happy to compose a new sample for you, free of charge, of whatever kind of writing you specify. Also happy to answer any questions you might have.