Application Architecture
Module 1
Layered Architecture
The most widely used application structure there is: what layering actually buys, the difference between closed and open layers, and the two failure modes that give it its reputation.
32 min2 lessons
Start moduleWhat you will be able to do
- Explain what a layer boundary protects and what it costs on every request.
- Distinguish closed from open layers and choose between them deliberately.
- Recognise the sinkhole and pass-through failures and respond proportionately.
- Place transactions, validation and mapping in the layer where they belong.
- Judge when layering is the right choice and when a different structure serves better.
- 11 min
01What a Layer Actually Buys
Layers are a dependency rule, not a folder convention: everything above may depend on what is below, and nothing below may know what is above.
- 11 min
02Making Layers Hold in a Real Codebase
Where transactions, validation and authorisation belong; why layering degrades quietly; and the mechanical checks that keep it honest.
Layered Architecture
6 questions · pass at 75%