Students: 16 hours/week all year OR full-time all summer, and internships are permit-free
Non-EU students on a study permit can legally earn: EITHER max 16 hours/week year-round OR full-time in June-August (not both). An accredited internship that is part of your Dutch programme needs no work permit at all - a signed three-party agreement replaces it. Your employer (not you) applies for the work permit (TWV); without it the paid job is illegal. EU/EEA students have no hour limit and need no permit.
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MAS reads your IND letter, checks whether an employer can legally sponsor you, and finds work that will actually take you. Free, no account.