"What's your title?"

The one staring at logs at 2am.
The one who wrote the docs no one reads.
The one who deployed and prayed.

Title: Builder.

"End-to-end ownership" sounds corporate.

Really it means:
You designed it. You defend it.
You broke it. You fix it.
You shipped it. You support it.

No handoffs.
No blame.
Just outcomes.