For a Sci-Fi Saturday post, this started as a stretch and then some. While Zero Sum Game (2018), by S.L. Huang, has at least a science fiction flavor, The Gun Seller (1996), by Hugh Laurie (yes, that Hugh Laurie), is more fantastical than science fictional. They do have in common a protagonist beyond capable as well as action hero thriller plots.
I can redeem the post now that I’ve read The Android’s Dream (2006), by John Scalzi (whom I’ve praised here before for Redshirts). Here, too, is an extremely competent protagonist in an action hero thriller. (As an aside, the two written by men feature a love interest. (While I’m at it, guess which of the three does not have a Wiki page.))
The bottom line: I thoroughly enjoyed all three!