vollzeit
full-time
Covering the full, regular working hours, as opposed to part-time. Usually used adverbially or as part of a compound word.
Sie arbeitet vollzeit in einer Anwaltskanzlei.
She works full-time at a law firm.

full-time
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full-time
Covering the full, regular working hours, as opposed to part-time. Usually used adverbially or as part of a compound word.
Sie arbeitet vollzeit in einer Anwaltskanzlei.
She works full-time at a law firm.

The word is simply made up of 'voll' (full) and 'Zeit' (time). It literally means that you work the entire, full working time.
Ein Vollzeitjob hat in der Regel 40 Stunden pro Woche.
A full-time job usually has 40 hours per week.
'Vollzeit' (full-time) is mainly used in two ways: as an adverb after a verb or as the first part of a compound noun. As an adverb, it is written in lowercase.
Mein Bruder arbeitet vollzeit als Programmierer.
My brother works full-time as a programmer.
In the context of work, fixed combinations like 'vollzeit arbeiten' (to work full-time), 'vollzeit beschäftigt sein' (to be employed full-time), or 'in Vollzeit tätig sein' (to work full-time) are very common. The nouns 'der Vollzeitjob' (full-time job) and 'die Vollzeitstelle' (full-time position) are also typical.
Er sucht eine neue Stelle in Vollzeit.
He is looking for a new full-time position.
full-time
'vollzeit' and 'hauptberuflich' both have to do with work and professions. 'vollzeit' mainly describes the amount of working time: you work the full normal number of hours and not just part-time. 'hauptberuflich' describes that an activity is the main profession from which someone mainly makes a living. That does not always have to be exactly the same thing. You can be self-employed 'hauptberuflich' and still have very different working hours. Learners may confuse the words because both often occur in professional situations. If it is about hours, 'vollzeit' fits. If it is about the main profession as opposed to a side job or volunteer work, 'hauptberuflich' fits.

Seit diesem Monat arbeitet er vollzeit in einer Arztpraxis.
Since this month, he has been working full-time in a doctor's office.
Sie ist hauptberuflich Lehrerin und gibt abends noch Sprachkurse.
She is a teacher as her main profession and also teaches language courses in the evenings.