I have taken on additional responsibilities beyond my original role.
'Responsabilità' = re-spon-sa-bi-li-TÀ; seven syllables, stress on the final accented one.
Use when your actual workload or scope has grown significantly beyond what was in your original job description.
This is one of the strongest arguments for a raise: you are doing more than you were originally hired to do, so your pay should reflect that. 'Rispetto al mio ruolo originale' (beyond my original role) frames the argument clearly without sounding like a complaint.
Il mio ruolo si è ampliato notevolmente nell'ultimo anno.
My role has expanded significantly over the past year.
Focuses on the growth of the role rather than the effort
Gestisco attività che non rientravano nel mio contratto iniziale.
I manage activities that were not part of my initial contract.
More contractual framing; use if there is written documentation
In pratica, svolgo le funzioni di un [ruolo superiore].
In practice, I perform the functions of a [higher role].
Directly claims a higher job level; bold but effective if accurate
In Italy, job titles and role descriptions are often formally attached to the employment contract (contratto di assunzione). If you are consistently performing above your contractual level, you may have a legal basis for reclassification and a corresponding salary uplift.