How to approach hard problems — first principles thinking for engineers
First principles thinking is a powerful engineering method for solving hard problems by stripping away assumptions, reducing a system to fundamental truths, and reasoning back up to a solution from those truths. In practice, it helps you avoid cargo-cult design, debug faster, and make architecture decisions based on invariants instead of habit.
What it is
First principles thinking means asking: what do we know for certain, what is merely assumed, and what must be true for this system to work?
Instead of copying a known pattern because it worked somewhere else, you decompose the problem into constraints, facts, resources, and failure modes, then build the simplest solution that satisfies them.
