Architecture decisions that age well
A solid architecture is not the most ambitious-looking one, but the one that stays readable when the context changes.
Architecture ages well when it stays readable under pressure.
That applies both to business applications and to SaaS products.
Stay proportional
The first useful reflex is often to reduce the number of structural decisions taken too early.
Define clear interfaces
Boundaries between modules, applications or services should remain understandable by the team, not only by the person who made the initial choice.
Work with the actual context
Architecture is not only a technical answer. It is also an answer to team size, maturity, budget constraints and delivery rhythm.
A good architecture is rarely spectacular. It is simply coherent when pressure increases.