Why Senior Developers Make Faster Decisions (It's Not Experience)

Here's something that's been bothering me for years: two developers with identical years of experience can have wildly different decision-making speed and quality. One agonizes over every library choice. The other picks confidently and moves on, and they're usually right. We tell ourselves the fast one just "has more experience." But that's a lazy explanation. I've met 15-year veterans who are paralyzed by every technical choice and 5-year developers who cut through ambiguity like a scalpel. Last year, I set out to understand why. I interviewed 43 senior and staff engineers across companies ranging from early-stage startups to FAANG. I asked them one question: "Walk me through how you made your last significant technical decision." The patterns that emerged had almost nothing to do with experience. They had everything to do with decision frameworks. The Experience Myth Let me be clear: experience matters. Pattern recognition is real. But experience is necessary, not sufficient, for fas