Code quality is a result of many factors, but the single biggest factor is whether Management treats developers as a profit centre or as a cost centre. That makes the difference in:

- Developer compensation

- Training and career development

- Staffing properly i.e. not under-staffing

- Giving devs proper slack time between tasks and not over-burdening them with projects

- Letting developers own the stack not just in name only but truly own the technical decisions made in the stack without micro-management, including choice of language, platform, etc.

Without all those factors, it's a red herring to point to the code quality. The code quality is just the final output of all of the above decisions.