I'm a little confused by both the question and the current answers. Maybe because, when I've had that position, there was a project manager that or similar that

I'm a little confused by both the question and the current answers. Maybe because, when I've had that position, there was a project manager that or similar that dictated what should I do and what was expected from me. Also being new with a tech stack is enough of a handicap to keep me busy getting to speed, so adding quality and better engineering practices had to wait. Actually, the first time that I found myself in such a situation, I later regretted I had not invested much more time in learning the framework so I could had detected bad design that later slowed us.