She (work)…………………….as an engineer since 2020.​

She (work) as an engineer since 2020. = She has (worked) as an engineer since 2020

En espérant t'avoir aidée !

Bonjour

She has worked as an engineer since 2020.

Il s'agit d'une action débutée dans le passé et qui continue dans le présent. On emploie donc le present perfect

Have/has + p. passé

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si on veut insister sur la durée, on emploiera alors le present perfect continuous

have/has + been + BV ing ==>

She has been working as an engineer since 2020.

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Bonne soirée ☺☺☺