When preparing for system design interviews, don’t chase every possible use case. Instead, go deeper into a few real-world stories. The real learning lies not in the final architecture but in the transitions how systems started small, the decisions made along the way, and the new challenges that emerged.

👉 Why focus on transitions?

• Learn the real trade-offs engineers faced

• See how today’s solution creates tomorrow’s problem

• Understand scalability and trust decisions in action

• Build a mindset for evolving architectures, not static ones

I’ve covered Facebook’s evolution (multi-part series) and DynamoDB’s journey in detail on my blog. More such stories are on the way, don’t miss them! Subscribe to my newsletter 👇