Iterations and assigning roles to the GPT help. Give a small block of code, ask GPT to review this with a panel of developers (frontend, backend, ...), users and UI/UX experts for 5 iterations, and then provide the final code. GPT 4 works better. However, a lot of times the code is outdated and creates new issues. Manual review and fixes are needed for most custom code blocks. It works well for standard code modules.