Section 01 of 07
Home infrastructure: a camera, a mirror, a file server and a gateway, all behind one contract.
Four services that share one four-endpoint contract and nothing else: no database, no library, no host. A camera, a mirror, a file server and a network gateway all appear in the same phone app, and none of them knows the others exist. The interesting part is not any one module; it is that the contract held while the modules got this different from each other.
Layer 1 of 4
One phone app that has never heard of any module. It renders what the contract hands it.
Building — Actively being worked on right now. Personal · 2026
The iOS side: a Swift package that talks to every module, built before there was an app to put it in.
Layer 2 of 4
Four endpoints and one event envelope. The only thing the layers above and below share.
Shipped — Finished, or finished enough that the write-up is about what it does. Personal · 2026
Four endpoints, and the argument that they are enough.
Layer 3 of 4
Services that implement the contract alone. No shared database, library or host.
Shipped — Finished, or finished enough that the write-up is about what it does. Personal · 2026
A file server that checks its own backups are readable, and tells you when they are not.
Shipped — Finished, or finished enough that the write-up is about what it does. Personal · 2026
A camera that recognises faces at a door, and the reasoning about why the lock stays disabled.
Shipped — Finished, or finished enough that the write-up is about what it does. Personal · 2026
A monitor behind two-way glass that wakes up when you walk towards it.
Planned — Specified and not started — the reasoning is usually the interesting part. Personal · 2026
A network gateway, and an honest conflict with the platform's own rules.
Layer 4 of 4
Code shared by choice rather than by contract: the recognition engine a module is built on.
Shipped — Finished, or finished enough that the write-up is about what it does. Personal · 2026
The shared recognition library, and the voting rule that decides when a guess counts as knowing.