"Developers don't write automated tests
"Developers don't write automated tests. That's QA's job".
I just had a consulting call with a dev team in this situation. I see this often, and it's not ideal.
Ideally, devs should write tests and *collaborate* with QA to improve the tests.
Automated tests accelerate development, document intent, and assure the code works right.
So, ideally tests should be created and written as part of the development process, not after.