Starter? Quick-Win required? JavaFX on JDK17 with nice & smooth screen notification

Optimal job for newcomers here but with good experience on JavaFX!

I require a small javaFX (latest version) prototype which does
- on starting the application shows a start screen
- on demand to open a nice popup dialog on all available displays

We require this prototype to test if we can use for a background running java App so show some important notifications

- no special logic required, only a status class and a observer on change of the registered status
- No framework required (spring or something, if you think you require, let us know)

This is a prototype to test with some human test users. So no big logic required, only JavaFX expertise!

you deliver the code, which basically has
- a main(),
- opens a splash screen on starting
- register to system tray
- display a nice status dialog (with fade out and close button) on status change
- ensures only one instance of app is running
- provide user decision to kill already running instance or to open other instance instead

Delivery Milestones:

MS1:
javaFX delivery for splashScreen, status and system tray
clean code
Needs to work well on windows 10

MS2:
works also on Linux (e.g. use Ubuntu 20.04 LiveDVD on virtualPC/virtualBox)
and on windows 11
delivery of the rest
- ensures only one instance of app is running
- provide user decision to kill already running instance or to open other instance instead

MS3:
needs to work well on MacOS 11 (Big Sur) and newer


delivery?
- in our git (will be shared after award)
- as java source delivery
- clean module and lib dependencies
- maven (dependencies are all managed there)
- required libs need prior confirm to be accepted
- JDK17 compatible

your bid?
you provide estimate per milestone, we may discuss about requirements
we confirm, you implement

Budget?
we do not disclose, place your best bid to get considered

Hint:
be ensured, your bid will be checked by java developers. This is a test task for integrating you into an ongoing project. So dear overseller and sales manager. We know the complexity of the task, and thus we also know if your bid is realistic. Be aware we will only hire the freelancers/companies wo play open and honest on the bid

Outlook:
we will award you all changes for the next steps of the prototype and the requirements we implement
We will require for this a NDA!