Comment by Twirrim
2 days ago
Microsoft, Amazon, Oracle, Google, all sorts of large companies use them, and talk about it, publicly. They've all published whitepapers and resources about them. Microsoft even employs Dr. Leslie Lamport who created and maintains TLA+ (among other things).
Just for some quick examples:
Microsoft: https://github.com/Azure/azure-cosmos-tla, https://www.youtube.com/watch?v=kYX6UrY_ooA
Google: https://research.google/pubs/specifying-bgp-using-tla/, https://www.researchgate.net/publication/267120559_Formal_Mo...
Oracle: https://blogs.oracle.com/cloud-infrastructure/post/sleeping-... (note the author is a "Formal Verification Engineer", it's literally his job at Oracle to do this stuff)
Intel: https://dl.acm.org/doi/10.1145/1391469.1391675, https://link.springer.com/chapter/10.1007/978-3-540-69850-0_...
Jetbrains: https://lp.jetbrains.com/research/hott-and-dependent-types/
Lamport+Microsoft was the first thing that I thought of when I read the comment. FWIW he retired at the beginning of this year.