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Marien van Os has been working in the field of front-end development since 1999. Marien began their career as a Front-end Developer at Marvos DP and then moved to TouchTribe in 2013, where they held the same role. In 2015, they began working as a Senior Front-end Developer at both Valtech Nederland and Nextail. Marien then moved to 9Yards in 2012, where they were also a Front-end Developer, and then to Belfius in 2012, where they held the role of Senior Front-end Developer. In 2007, they began working as a Front-end Developer at Mirabeau, and in 2009 they took on the role of Photographer at Marvos Photography. Finally, in 2019, they started as a Senior Frontend Developer at Saxum, and in 2021, they began working in the same role at Mingle Sports Technologies.

Marien van Os began their educational journey in 1987 at the Haags Montessori Lyceum (HML), where they earned their HAVO degree in 1993. Afterwards, they attended the HKU (Hogeschool voor de Kunsten Utrecht) from 1993 to 1994, studying Beeld- MediaTechnologie. From 1995 to 1999, they attended the Amsterdamse Hogeschool voor de Kunsten, where they studied New Media. No additional certifications have been reported.