Ask HN: How to enforce engineers to understand the code they are shipping

Everyone is using AI for everything now. Company is pushing for AI-first and encourages the adoption of AI in every part of our work.

AI for planning, AI for RFC, AI for writing code, AI for creating PRs. Sure we can have harnesses and tests to ensure nothing breaks. But how do we enforce engineers to have a deep understanding of the code that they are shipping?

Our team has the usual suggestions: write a plan first, write test cases first, etc. But in this age, how do you verify that the engineer did not simply delegate these tasks to an LLM first?

Also genuinely worried about junior engineers' growth if this is the future.