Do you have experience in system design — planning architecture from scratch, defending it before the team?

Yes, I have experience in system design from scratch. I usually start with analyzing requirements and constraints, then form a high-level architecture, highlighting main components and their interactions. After that, I detail key modules, considering scalability, fault tolerance, and performance. When presenting the architecture to the team, I explain the choice of technologies and patterns, demonstrate how the architecture addresses business challenges, and considers potential risks. It's important to openly discuss alternatives and be ready for feedback.