Final answer:
Developers ensure good application architecture through practices like regularly refactoring code to maintain quality and adaptability, and by conducting code reviews for early issue identification and improved code quality.
Step-by-step explanation:
Developers can ensure a good application architecture by engaging in practices such as regularly refactoring code and involving the team in code reviews. Refactoring is the process of restructuring existing computer code without changing its external behavior, which improves nonfunctional attributes of the software. Regular refactoring helps to maintain code quality and to adapt the codebase to changing requirements or technology, thereby avoiding technical debt, which is the implicit cost of additional rework caused by choosing an easy solution now instead of using a better approach that would take longer.
Moreover, code reviews involve systematically examining source code by one or more peers, which can identify issues earlier and improve code quality. Isolation can lead to oversight and missing broader system impacts, which is why working as a team and collaboration are fundamental to good architecture. By avoiding working in isolation and ignoring technical debt, developers contribute to a more robust and maintainable architecture.