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24+ curated questions with the same answer shape every time: quick recap, deep dive, pitfalls, and follow-ups. Coverage includes design fundamentals, scalability, load balancing, caching at scale, and more.
Suggested path
Topics follow a teaching order. Each answer ends with a clear Next question control so you can move forward without hunting the list.
System design interviews are the senior/staff round that tests whether you can architect at scale. This module is an elevation arc: it opens with design fundamentals (the approach, the requirements gathering), then the core primitives — scalability, load balancing, caching, the CAP theorem. High availability and database design at scale follow, then the architecture patterns — event-driven and microservices design. Capacity planning closes the advanced tier, then comparisons and scenario-based design questions.
Full catalog
Topics are ordered for learning. Within each topic, rows are numbered 1–24 globally so you always know where you are. Collapse topics if you want a lighter view — use Expand all when you need the full list again.
Numbers 1–24 follow the order we recommend — click any row to open the full answer, or use the sticky Next link at the bottom of each page to go Q1 → Q24.
Interviewers rarely ask System Design Fundamentals in isolation. These are the modules that most often come up in the same loop.