Why Even Senior Engineers Struggle to Pass the System Design Interview?

Senior engineers often fail system design interviews despite real-world experience because interview success requires structured thinking, clear communication, and trade-off reasoning under time pressure—skills distinct from day-to-day work. Success comes from mastering frameworks that break problems into components (requirements, APIs, data modeling, scalability), practicing with realistic scenarios, and learning to articulate design decisions. Key preparation strategies include using structured learning platforms, practicing mock interviews, understanding fundamentals like caching and consistency models, and internalizing trade-offs rather than memorizing patterns.