On what principle will you choose the architecture for your project?

The choice of architecture depends on several factors, key among which are:

1. Project scale and expected load: A monolith is suitable for small projects, while microservices or distributed architecture are better for large or high-load projects.
2. Flexibility and development requirements: Microservices facilitate parallel development and independent deployment. Monoliths are simpler in initial development.
3. Budget and development timelines: Complex architectures require more time and developer expertise.
4. Team experience: The architecture should be manageable and understandable for the current development team.
5. Domain specifics: Some domains are better suited to certain architectural styles (e.g., CQRS for systems with a clear separation of read and write operations).
6. Need for future modifications: How easily the system can be modified and expanded in the future.

Typically, I start with analyzing requirements and business processes, then assess potential risks and limitations of each architectural style in relation to the project, and only then make an informed decision. Preference is often given to proven patterns like DDD or Layered Architecture, with the possibility of an evolutionary transition to other styles if necessary.