I loved Just For the Summer, Abby Jimenez (and almost everything by her). The couple here meets over a Reddit thread and she slides into his DMs. I thought the texting/DMs dialog was pitch-perfect.

https://www.goodreads.com/book/show/195820807

Books that come to mind are The Soulmate Equation by Christina Lauren (DNA-based matching service) and Alisha Rai's series Modern Love that includes The Right Swipe, Girl Gone Viral, and First Comes Like.

are there any good books that involve tinder or any of the modern online dating? It seems romance novels are still "he was in front of me at the coffee shop!"