Ask HN: Agentic coding workflows for complex features and large codebases?

I’m a software engineer looking for real-world examples of excellent developers using agentic coding tools (like Claude Code, Gemini, Codex, etc.) to build complex features or fix bugs in large production codebases. So far, YouTube is full of founders hyping their own AI-coding products or creators building yet another todo list app.

Does anyone know of senior developers demonstrating how they actually use agentic coding in production settings?