What size is the company? For a big company, just prevent merge to main unless approved by another team member. Set up pairings, like Junior<-->Senior reviews. The junior reviewer will learn a low from the senior coding style.

For very small companies, ask yourself if you have time for code review. If you do, great -- but sometimes you are all just burning the midnight oil in those 1-5 person companies just to KTLO. Maybe do with less frequency if company is tiny and doesn't have PMF.