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Stefan Kellner has a diverse work experience, starting in 2004 with their role as an Advisor, Consultant, and Interim Manager, where they provided consulting services in digital strategy, company building, restructuring, lean startup, venture development, product management, technology, and software development. Stefan worked with notable clients such as Deutsche Bahn, RWE, Innogy Innovation Hub, Rewe-Touristik/DER, TUI/Robinson, and Lufthansa Innovation Hub.

In 2016, they became the CEO of Qixxit, an intermodal travel search and ticketing platform, and successfully restarted it as an independent spin-off for Deutsche Bahn AG. Stefan also worked as a Mentor and Venture Developer at innogy Innovation Hub for a brief period in the same year.

Prior to that, Stefan Kellner founded and served as CEO of 7Moments UG, where they focused on specific projects. Stefan was also the Founder and CEO of door2door, a company aimed at making cities smarter through innovative transportation solutions.

In 2015, Stefan Kellner was the Founder and CEO of Mission Control, a 24/7 travel concierge project at Lufthansa Innovation Hub. Stefan later took up the role of Head of SoLo Maps on Devices at Nokia from 2008 to 2010.

From 2020 to 2021, Stefan Kellner worked at BeyondBuild GmbH as part of the Product and Venture Building team. The company focused on creating and implementing digital solutions for real estate projects, with an emphasis on sustainability and asset value.

In 2021, they became the CEO of Scoperty, which provides estimates for residential properties in Germany to enhance transparency in the real estate market.

Currently, Stefan Kellner is the CEO of kollex, a company that digitizes the food industry by offering a convenient and safe way for restaurateurs to order food and drinks through their app. The platform aims to save time and money for chefs and merchants through a quicker order process, fewer delays, and transparent transactions.

Stefan Kellner completed their undergraduate studies in Law at Heidelberg University from 1991 to 1997, earning their Erstes Staatsexamen Rechtswissenschaften degree.