🛠️ The Senior Software Engineer Playbook: From Good Coder to High-Impact Engineer 🚀

A deep, opinionated, practical guide for the engineer who has crossed the mid-level threshold - or is about to. The mental models, technical habits, ownership patterns, communication skills, and career mechanics that separate "solid senior" from "engineer the whole team builds around." Grounded in 2026 reality - AI-augmented coding, distributed async teams, post-ZIRP efficiency pressure, and a market that rewards impact over activity. If you read only one section first, read §2 Mindset, §5 Ownership, and §14 Writing. Everything else is the implementation of those three.