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Crafting impactful products for 10+ years, engaging over 160,000 users, collecting over €23 million in donations and connecting over 500 communities worldwide.
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Sietze-Jan played a key role in building a platform that now connects 150,000 people in over 500 churches. His vision for UX/UI helped create an app that engages and activates users. The design and architectural choices he made still form the foundation of our platform. His work was fundamental and remains a source of inspiration for our team.
Henrik Wienen
CEO Donkey Mobile