Software Architecture: Layers, Services and Their Trade-offs
Architecture is the set of decisions that are expensive to reverse: what is split from what, what talks to what, and where state lives. Splitting a system into services buys independent deployment and pays for it in network calls, partial failure and versioning.
What a learner can do afterwards
- Name the decisions in a design that would be costly to change later
- List what a team gives up when one program becomes several services
- Choose a split for a stated growth problem and defend the boundary
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Architecture is the set of choices that are costly to reverse: what is split from what, what talks to what, and where state lives. Like walls in a house, they are cheap to move on paper and costly to move after building. So you plan them early and with care.
A shop splits its single program into three services: orders, payments, and stock. Each team can now ship its own service alone. But every checkout now needs network calls between services, and a failure in one can stall the rest.
Splitting buys independent deployment and separate scaling. It charges network calls, partial failure, versioning, and keeping data consistent. A layered design keeps parts ordered but adds steps between them.
To defend a boundary, name the growth problem first, then show the split fixes it. Split where the load or the team grows apart, and keep together what must stay consistent.
Name the costly choices, weigh what services buy against what they charge, and defend each boundary with the growth it serves.
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Take it off screen
Where it sits
8 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.