Setup Suggestions For Built In Speakers Throughout The House

(First post, an audiophile friend sent me this way.)

I just bought a house that came with some built-in speakers throughput and am looking for suggestions on what equipment I should get to create multiple dynamic zones.

Details: There are currently 4 pairs of speakers:
1. Two in-ceiling in the living room.
2. Two in-ceiling in the dining room (with volume control knob).
3. Two outdoor speakers in the backyard.
4. Two in-ceiling in the master bedroom (with volume control knob).

All four pairs are independently wired and the wires terminate in an area that has plenty of room and ventilation for equipment, if needed.

What I'm hoping to achieve is a setup where I can dynamically direct the individual speaker pairs across up to three independent zones playing different audio.

For example, I can imagine a situation where I want
Zone A: pairs #1 and #2
Zone B: pair #3
Zone C: pair #4

Or, maybe
Zone A: pair #1, #2
Zone B: pair #3
(#4 off)

But also of course
Zone A: pairs #1, #2, #3, #4

And so on, and so on.

The audio source for all of these zones would very likely be streaming (Spotify, Chromecast, etc).

So, hivemind, is it possible to make this vision come to life? I'm a software engineer by day so am not averse to doing some Android development or utilizing a Raspberry Pi type device to control switches, for example. I have a decent understanding of audio equipment and terminology, although admittedly haven't played around with anything more advanced than a receiver/amp+5.1 speaker setup in ~20 years.

Thanks!