Which repeated decision deserves to become a service rather than a collection of copied code?
REFERENCE PROCESS / CONCEPTUAL
01 / ENGINEERING NOTE
Observe repeated decisions
Search, identity, notification and workflow logic may appear in several applications. Not every duplicate deserves a service. The stronger signals are divergent authorization semantics, repeated incident patterns, incompatible audit behavior and real pressure for coordinated change.
Measure duplication of responsibility, not only lines of code.
02 / ENGINEERING NOTE
Do not centralize too early
A platform built before variation is understood can force every product through a premature abstraction. Teams become slower as shared policy and release processes consume attention. Sometimes local duplication is the more reversible decision.
Explicitly record why a boundary should be shared now.
03 / ENGINEERING NOTE
Treat developers as users
Once a shared capability has consumers, documentation, onboarding, migration, version contracts, observability and support become product work. A technically elegant API that is difficult to adopt exports its complexity to every team.
Observe the time to first successful consumer integration.
04 / ENGINEERING NOTE
Measure leverage and reversibility
The aim is safer product change, not maximum centralization. Evaluate incident blast radius, deployment independence, consumer migration costs and operating ownership. Keep an exit route around volatile dependencies.
A platform proves value by reducing repeated coordination.
These notes describe design reasoning, not a product certification or client deployment.
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