we explore the core principles from A Philosophy of Software Design by John Ousterhout, a thought-provoking guide to building cleaner, more maintainable systems. We discuss why complexity is the enemy, how to recognise and reduce it, and practical techniques for writing code that stands the test of time. Whether you’re a new developer or a seasoned engineer, you’ll gain valuable insights on modularity, interfaces, abstraction, and the art of making design decisions that last.