Off the top of my head:

https://www.infoq.com/

https://github.com/binhnguyennus/awesome-scalability

https://engineering.linkedin.com/distributed-systems/log-wha...

https://www.microsoft.com/en-us/research/blog/

https://research.ibm.com/publications

I recommend the one I usually read: https://www.ratherlabs.com/blog

Databases:

Murat Buffalo - https://muratbuffalo.blogspot.com/

General:

Julia Evans - https://jvns.ca/

Here's a couple of blogs off the top of my head that I like.

https://gwern.net - This is just a fantastic nerdy blog on so many topics.

https://world.hey.com/dhh - I don't always agree with him and he doesn't always go super in-depth into deeply nerdy topics, but I appreciate his clear writing style and willingness to go a bit against the grain and ruffle a few feathers.

Truth be told though, it looks like a lot of the more talented people are focusing more on things like YouTube for communicating about technical topics. And that's not necessarily a bad thing.