When to raise middle to senior?

Question

Software testing

It's about QA, but the question is rather general.
I ask, because management experience required. As you understand, that a person is already pulling to the next step. If he just wants more ZP, then this is not connected.
Yes, I already asked - What is the difference between a junior tester and an ordinary one and an ordinary one from a senior one?
But it seems to me that it was not clear why the seemingly obvious question

Answer 1

The leader is already a little (and sometimes even a lot) leader.
They are promoted to the head when
1. The person has grown to lead
2. The person was liked by the higher leader.
3. There was a need to single out a group or task/project with the delegation of its leadership to an individual (the current leader is overloaded).
Usually you need all three points to converge, although one of them is enough.

Answer 2

Signor tester is a rare bird. It lives in large companies where there are large and complex projects. He is not afraid of new projects, he is not afraid of shitty code, he knows how to find errors and fixes that a fallen project can raise. Finds errors in the infrastructure. Finds bugs in open source software, fixes them and gets them accepted.
There is no formal reason for the promotion, other than the manager's instinct, which is based on the analysis of the bug tracker and personal communication

Answer 3

This should always come from the tester himself, and what a senior the tester can be, he is not a programmer.