I'll make it a short list of recent authors I've liked:
- Adrian Tchaikovsky. He's best known for his Children of Time series, but his other scifi books are also excellent; I haven't read the fantasy ones. "The Expert System's Brother" is particularly excellent.
- James Cambias. "A Darkling Sea" is a tremendously cool novel set at the bottom of an ocean under a moon's icy surface. Arkad's World has some very interesting world-building & aliens. And Corsair is a fun near-future technothriller about near-space and moon mining.
- Stephen Baxter (author of the Xeelee Sequence) writes very good books, but just about none of them have a happy ending, and they're mostly grim - but very interesting.
- It's not HN if I don't recommend Greg Egan, Peter Watts, and Neal Stephenson.
That particular novel isn't the author's best work, but it's decent - his other stuff is much, much better imo.
I'm also surprised to see somebody recommend A Darkling Sea! I don't think I've ever met someone else who's read it and recommended it before. The somewhat odd sidestory of the aliens who communicate through sex has turned off the couple people I've recommended it to from the story, pun not intended.
I'm working through The Final Architecture series right now, it's got some absolutely great SF.