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Briefly about myself:

Bachelor: Mechatronics and Automation.
Master: Entrepreneurship and Business Design.

I’ve always been curiously pursuing opportunities to learn and gain new experiences and knowledge. In the recent years I developed several iOS apps and offered them in the app store; built my own CNC machine and 3d printers; got into CAD, photography, and web-development; co-founded Ophena where we developed and sold products for millions of Euros; designed logos and built websites for several not-for-profit organisations and for-profit companies; produced music; got into DJing on Weddings; co-founded a social venture operating in South Africa and Sweden; built eCommerce stores on Woocommerce and Shopify; developed microcontroller-driven QA-devices; fulfilment software using NextJS and Supabase – integrating Shopify with DHL for domestic and international shipments.

Some older projects below. 


Past Projects

  • Poster Design for umnandi

    Poster Design for umnandi

    I designed this poster for advertising the workshops we held with umnandi in South Africa.

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  • Who of Us Online

    Who of Us Online

    As my app store app will not be available any longer, I decided to develop an online version of the game. It is accessible here. The questions are stored in a mySQL database. A javascript then requests the questions via a php script. Nothing too hard, but I didn’t know how to do it… until I did it.

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  • Who of Us App

    Who of Us App

    Update 19 March 2017: The iOS app will soon disappear from the app store, since it is not commercially viable. However, I developed a simple online version. I describe the development in this post. The App Who of Us is an app I build a couple of years ago. Inspired by a card game, I set…

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  • Zitate 2.0

    Zitate 2.0

    Zitate 2.0, which translates to Quotes 2.0, is another iOS app I created. It features a great amount of quotes, sorted randomly. You can favourite quotes, export the text, or generate memes and share them with friends. You get the app here: Zitate 2.0 by Simon Geldner

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  • Event Logo

    Event Logo

    I designed this logo for the yearly Parkour Camp in Gütersloh. Parkour Camp is an event with around 200 participants. The logo displays the motto we had chosen for 2016 and is printed on shirts that all participants get.

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  • Parkour Gütersloh

    Parkour Gütersloh

    I designed the website http://www.parkour-guetersloh.de free of charge. It offers information about our training, projects, staff and more. This website now also contains the Parkour Charity Blog.   Home

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  • umnandi Website

    umnandi Website

    umnandi is a nonprofit organisation that sets out to Empower African Entrepreneurs. I co-founded the organisation in late 2016. Besides developing workshop concepts, applying for funding, establishing partnerships etc., I took the initiative to design the logo and website. Website simple. one pager. inspirational. informative. www.umnandi.com

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