Were the deliverables fixed by the management or you were responsible for the estimate? If you are the one who consistently underestimates the time, maybe that'

Were the deliverables fixed by the management or you were responsible for the estimate? If you are the one who consistently underestimates the time, maybe that's a legitimate point. Ultimately, it is stupid if they'd favor giving a project to an intern over you despite your results/writing maintainable code etc. The company will pay for shit code accrued over time.