The spec-driven approach resonates. I've found that the quality of the initial context you feed to AI coding tools determines everything downstream. Vague specs produce vague code that needs constant correction.

One pattern that's worked well for me: instead of writing specs manually, I extract structured architecture docs from existing systems (database schemas, API endpoints, workflow logic) and use those as the spec. The AI gets concrete field names, actual data relationships, and real business logic — not abstractions. The output quality jumps significantly compared to hand-written descriptions.

The tricky part is getting that structured context in the first place. For greenfield projects it's straightforward. For migrations or rewrites of existing systems, it's the bottleneck that determines whether AI-assisted development actually saves time or just shifts the effort from coding to prompt engineering.