I don’t care much about location, but I would use a notification service that is provably end-to-end encrypted. Possible use cases:

* Long build finishes on my PC. Send me a message on the phone.

* Log watcher detects an issue on a server. Send me a message.

* CI job fails. Same.

* Some notification pops up in my laptop’s browser. Forward it to the phone.

Last time I looked at apps doing this, they either did not appear particularly trustworthy, or were too limited.