expertReal System Design Problems
Design Meta's Cross-Platform Identity System — one identity across Facebook, Instagram, and WhatsApp.
The unified-identity-across-products problem: how user identities are linked across products that each have different underlying data models, how privacy requirements and regulatory constraints differ across products and jurisdictions, and how a change to one identity correctly propagates to every linked product.
Ready to design this system end to end?
Generate a complete, structured system design answer — requirements, capacity estimation, API design, architecture, database choice, scaling, caching, fault tolerance, security, trade-offs, and more, walked through the way a strong senior engineer would in a real interview.
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