Domain Prototyping and Whirlpool Process.

Senior DDD is about architectural trade-offs, scalability, and high-level strategic alignment with business goals.

At a senior level, you must decide between Event Sourcing and State-based persistence. You use CQRS to ensure the read model is optimized for the UI while the write model (the Aggregate) focuses purely on business rules. Strategic design (Context Maps) becomes more important than Tactical design (Value Objects).