Practicing engineering manager here: if you're overly enthusiastic about your current project/task and you can learn from it then it's ok to work more but in ge

Practicing engineering manager here: if you're overly enthusiastic about your current project/task and you can learn from it then it's ok to work more but in general I'd suggest doing personal projects, widening the horizontal bar on your T-shape (https://en.wikipedia.org/wiki/T-shaped_skills https://en.wikipedia.org/wiki/T-shaped_skills) and/or getting your feet wet in different fields like UX, online marketing or product management. I'm always super excited and proud when I hear my engineers talk about their sideprojects on our 1on1s. I find that (constant) overtime is just not worth it. While it may seem like good citizenship to put in constant extra effort but in the mid- or long run you'll feel that it becomes an expectation and you're not being compensated for it. It will lead to burn-out with time. If the projects are constantly badly planned/estimated use your extra time to get better at planning and estimation and coach your team on it - if you're slow and that's why you'd need to work more then use your extra time to get better in your trade with focused practice.