01
Start with structure
Show services, connections, and the reasoning behind the architecture—not just a wall of text.
SYSTEM DESIGN COPILOT
Keep the design.
Change the requirement.
From a connected architecture to the next follow-up. Build on the existing diagram instead of starting again.
02
Make the next change
Add Redis, introduce a service, or revisit a dependency in the context of the existing design.
03
Explain the trade-offs
Continue the conversation about failure, consistency, latency, and the decisions that matter.
Keep the original architecture in view.
Explanatory architecture · not generated app outputClient → API → Link service → PostgreSQL
↳ Redis is added beside the Link service.
PostgreSQL remains the source of truth.
↳ Redis is added beside the Link service.
PostgreSQL remains the source of truth.
Redis adds a cache alongside the existing system. PostgreSQL remains the source of truth; discuss cache misses, consistency, and failure as follow-up questions.
Your next interview.
A clearer way through.
See the product. Try a real question. Make your own decision.