Product-first architecture
Start from customer workflow, delivery speed and expected scale rather than building enterprise complexity before it is needed.
Domain context changes the engineering choices.
Lean infrastructure
Use managed or simple operating patterns where they reduce effort, while keeping data ownership, security and recovery explicit.
Build vs buy
Keep custom engineering focused on differentiation and use proven services where they safely remove undifferentiated work.
Scale when evidence says so
Instrument performance and cost early enough to see when a database, API, queue or infrastructure pattern actually needs to change.