Let the programmers do what they want. The code just "works"

I have inherited a large application built over years without real structure. I managed in some way to improve it and make it in a commercial product sold to more than 20 customers.

Now more programmers are coming in. The CEO and the PM, skipping totally my responsability as tech coordinator, ask any kind of feature development on a daily base to juniors or less juniors.

I cannot enforce any coding or architectural guidelines. Things just get added on a "I want it now - it works" basis.

I don't know really if I should just "let it go" or try to enforce my vision...

Agile methodology will not be understood by the team. We don't have any kind of unit testing nor bug management. We deploy several time per day.