Learn how to build a startup in just 48 hours - from December 12 - 14, 2025! Test your own idea or work on other ideas, receive expert mentorship and pitch in front of an expert jury on Sunday! Food, drinks, fun, and a great experience included. đ
What is the Impossible Founders Sprint?
The Impossible Founders Sprint is a 3-day intensive workshop where you'll develop a viable business model from a mere idea in just 48 hours. Experienced mentors from the startup scene will coach and support you, and successful founders will provide valuable insights as speakers. You'll then pitch your developed business model to a select jury and potential investors. The best concepts will be awarded. Join us and seize this opportunity!
Who can join?
Startup enthusiasts, students, non-students, developers, designers, business developers, marketing gurus, engineers, nutritionists, innovators, investors... In short: anyone who is keen on startups, looking for a challenge, and is motivated and committed to developing a business model from an idea in a short amount of time.
Do I need to pitch my own idea?
No, you don't have to reveal your idea if you don't want to. However, you might miss a great opportunity, and someone else might pitch your exact idea, or a very similar one, at another Startup Weekend, and it wins, leaving you out of luck. Don't chase after developments. Be bold, act entrepreneurially... and of course, as a participant, you can also join a team around another participant's idea.
Mission
Our mission is to provide a fun environment where everyone can test ideas and experiment with entrepreneurship.
We enable participants to test ideas, build prototypes, and validate real solutions - supported by experienced mentors and a community driven by curiosity and action.
Agenda
Time is running...
until doors open
Friday, December 12, 2025
Saturday, December 13, 2025
Sunday, December 14, 2025
Location
University of Hamburg
The Impossible Founders Sprint will take place at the University of Hamburg!
Address
Von-Melle-Park 9
20146 Hamburg
How to get there?
S2 or S5 Dammtor
U1 Stephansplatz
Bus lines 4, 5, 112 Staatsbibliothek
Which building?
If you stand in the middle of the campus, we're in the building with the graffiti on the wall (the oneright of the "Wiwi-Bunker")
Who should I call if I'm lost?
Just call Andreas at +49 178 714 5167 and we'll pick you up

People
Mentors / Speakers / Jury
The following mentors, speakers, and jury members will support us. More to be announced soon!


Raoul Haschke
Head of hei_INNOVATION at University of Heidelberg
Event moderator
Raoul is a certified innovation and project manager with over 12 years of experience. He teaches entrepreneurship at Heidelberg University, leads their innovation transfer agency, and supports various institutions in developing their entrepreneurial strategies. Raoul is also a part of NEXTGN (Baden-WĂŒrttemberg's startup factory) and an experienced host of ideation events such as Techstar's Startup Weekend.


Prof. Dr. Jetta Frost
Vice President, University of Hamburg
Jury Member
As the Vice President of the University of Hamburg, Jetta is responsible for establishing and further developing knowledge exchange as the Universityâs third key performance area. She also oversees the strategic development of academic staff and academic career planning with a special focus on equal opportunity to promote gender fairness, diversity, and family-friendliness.


Dr. Arik Willner
CEO, Impossible Founders
Jury Member
Before becoming the CEO of Impossible Founders, Arik was the CTO of DESY, Hamburg's leading scientific research organisation. He is a trained physicist and an expert in turning scientific ideas into real companies. As a jury member, he will use his structured scientific approach to judge the teams objectively.


Heidrun Twesten
CEO Impacct GmbH, Lead @ encourageventures
Jury Member
Heidrun (MBA) is an entrepreneur and capital markets expert. She has built two companies, consulted 20+ IPOs, is an investor (angel/VC) and executive advisor to SMEs and scaleups. As a jury member, she will use her investorâs experience to assess the ideasâ financing potential.


Constanze Hachmann
Lawyer, Lutz | Abel
Workshop Host
Constanze is a lawyer for Lutz | Abel, specializing on commercial and corporate law. She and her colleague Lorenz Jellinghaus are well-known and highly respected lawyers in Hamburg's startup ecosystem and have consulted countless startups, investors and corporates. There are probably not many people in Hamburg who have been part in more startup funding rounds. In her workshop, Constanze will share insights into the most important legal aspects for startup founders and how to avoid common pitfalls.


Ralf Leister
Moderator, Pitch Trainer
Workshop Host
Ralf is an experienced event moderator, lecturer, and pitch trainer who is passionate about engaging and interesting live presentations. In his workshop, he will teach you his top 10 pieces of advice how to perform on stage as a founder - and to convince investors.


Priyanka Shah
Program Manager, Impossible Founders
Mentor, Event Organizer
Priyanka has led and scaled a deep-tech business, working closely with engineers, researchers, and teams building complex technology. As a mentor, she supports founders with clarity, practical problem-solving, and a builderâs perspective that understands both ambition and execution.


Andreas Kitzing
Entrepreneur in Residence, Impossible Founders
Mentor, Event Organizer
Andreas is a serial entrepreneur who has founded several startups, successfully sold some, and failed with others. He can support you with the view of a founder who has more than 20 years of startup experience. He also picked up some basic business skills during his MBA at the University of Cambridge.


Miriam Bundel
Founder, UX & design expert, book author
Mentor
Miriam is a creative multi-talent who has founded several organizations. She is the author of the book "Startup mit Plan and a trained graphics designer and UX expert. As a mentor and advisor, she has worked with startups as well as with corporates like Sparkasse, bonprix or Lufthansa.


Christine Tiedemann
Head of Startup Port Network
Mentor
If you are thinking of founding a startup out of one of Hamburg's universities, you will probably get in touch with Christine and her team. As the head of Startup Port, she and her team are coordinating startup activities across the universities and are consulting the students on any questions about entrepreneurship.


Nils Neumann
Head of Founder Support at TU Tech Innovation
Mentor
Nils is one of the veterans of supporting founders in Hamburg's startup ecosystem. He has been with TU Tech - the transfer organisation of TU Hamburg - since 1998 and has supported hundreds of founders on turning their scientific research into a real startup.
Partners
Our partners







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Get Tickets
The ticket registration is now open via our ticketing partner ChefTreff. Regular tickets will be âŹ49,00 for the entire event (food & drinks included). #freibier


