Marijn Mijnders studied with Davina van Wely at the Royal Conservatoire in The Hague and was awarded the Nicolaï Prize upon completion of her performance degree. She won the Prize of the City of Amsterdam at the 1985 Oskar Back National Violin Competition. Marijn Mijnders served as principal violinist of the North Netherlands Symphony Orchestra from 1985 to 1988.
In 1989, Marijn Mijnders was appointed assistant principal violinist of the Royal Concertgebouw Orchestra. She is also a member of the Uriël Ensemble.
Since 2015 Marijn Mijnders plays a beautiful Stradivarius, provided to her in loan via RCO's donors foundation Stichting Donateurs.