System Design Under Pressure

System Design Under Pressure 30 Real-World Architecture Problems Every Senior Software Engineer Should Know How to Solve Knowing how distributed systems work is one thing. Making the right architectural decision when production is failing, requirements are changing, and every option involves trade-offs is another. System Design Under Pressure explores 30 realistic software architecture problems that challenge engineers to think beyond textbook diagrams and idealized interview answers. Each scenario follows a consistent decision-making framework: PRESSURE — Understand the business and technical constraints. DIAGNOSE — Identify the evidence that matters. DECIDE — Choose an architecture and understand its trade-offs. DEFEND — Explain why the decision makes sense. BREAK — Explore failure modes and limitations. EVOLVE — Understand how the design should change as conditions shift. Through practical scenarios involving distributed systems, scalability, reliability, performance, and production operations, the book helps engineers develop stronger architectural judgment. Who this book is for: Senior software engineers preparing for architecture discussions and system design interviews. Tech leads responsible for making and defending technical decisions. Backend and distributed-systems engineers navigating production complexity. Developers moving from implementation-focused work toward system-level ownership. This is not a collection of architecture diagrams to memorize. It is a practical guide to reasoning through difficult engineering decisions, understanding what can go wrong, and defending your choices when the stakes are high.