der Nebenjob
side job
A paid activity that someone does in addition to their main job, often part-time.
Viele Studenten haben einen Nebenjob, um ihr Studium zu finanzieren.
Many students have a side job to finance their studies.

side job
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side job
A paid activity that someone does in addition to their main job, often part-time.
Viele Studenten haben einen Nebenjob, um ihr Studium zu finanzieren.
Many students have a side job to finance their studies.

The word is made up of 'neben' (beside / alongside) and 'Job' (job). So it literally describes work that you do 'neben' (alongside) your main activity.
Ich suche einen Nebenjob für die Abende.
I'm looking for a side job for the evenings.
The most common verbs used with 'Nebenjob' (side job) are 'einen Nebenjob haben' (to have a side job), 'einen Nebenjob suchen' (to look for a side job), and 'einen Nebenjob ausüben' (to work / carry out a side job).
Er hat einen Nebenjob, um sich das teure Hobby zu finanzieren.
He has a side job to finance his expensive hobby.
To describe the type of side job, you often use the construction 'einen Nebenjob als...' (a side job as...). The noun after 'als' is in the nominative.
Sie hat einen Nebenjob als Kellnerin in einem Café.
She has a side job as a waitress in a café.
minijob
'Nebenjob' and 'Minijob' can both refer to additional or small-scale work. The difference lies in the focus. A 'Nebenjob' is a job alongside a main job, studies, or another main activity. So the point is that it is not the most important activity. A 'Minijob' is a specific legal form of employment in Germany with a fixed earnings limit and special rules. A minijob can also be a side job, but not every side job is automatically a minijob. Learners often confuse the words because both sound like they involve little working time. If you are talking about the legal form, 'Minijob' is more precise.

Neben dem Studium hat Lisa einen Nebenjob in einer Bäckerei.
Alongside her studies, Lisa has a side job in a bakery.
Für den Minijob im Supermarkt darf Max nur bis zur gesetzlichen Grenze verdienen.
For the minijob at the supermarket, Max may only earn up to the legal limit.