Noting that you asked for company blogs and not personal blogs: I think the most interesting ones are among startups since at larger scale there is still great technical content but it's more of just a random collection of great writing and no coherent story-telling tied to the company itself.
Like Microsoft has awesome random blogs all over the place (Raymond Chen for example). Etsy, Netflix both have good ones. They just don't tell any single story about the company any more.
So among smaller companies with strong technical+narrative writing I think of Tailscale, HoneyComb, Memfault, maybe Oxide Computer, maybe Trail of Bits.