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.
Note: Since we provide free beer at the event and we can't provide a 1:1 supervision while you work in your teams, you need to be at least 18 years old to participate in the event.
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.
If you have any questions, feel free to call or WhatsApp Andreas at +49 178 714 5167.
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, 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.


Peter Figge
CEO, Jung von Matt AG
Speaker
Peter Figge is the CEO of Jung von Matt, one of Europe's largest, most successful, and definitely most creative communication agencies. EDEKA's "Supergeil" and Christmas campaigns, Saturn's "Geiz ist geil", the creative ads of car rental company SIXT - all of them have been developed by Jung von Matt. Before joining Jung von Matt, Peter spent around 15 years in senior roles at leading international agencies in Zurich, Paris, New York and Hamburg. He will join us on Friday and share his - and Jung von Matt's - growth story.


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, Workshop Host
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. On Saturday, she will share her investor knowledge in a workshop on startup investments. As a jury member on Sunday, she will use her investorâs experience to assess the ideasâ financing potential.


Simon Knittel
Managing Director, Jung von Matt START
Jury Member
Simon Knittel is Managing Director at Jung von Matt START, the startup-focused unit of the Jung von Matt agency group. Based in Berlin, he and his team help early- and growth-stage companies build strong, scalable brands across sectors like digital health, energy, lifestyle, cybersecurity and FMCG. Under his leadership, JvM START has introduced innovative models such as revenue-based financing for brand work and publishes the annual Startup Brand Ranking as well as the satirical âuniKorn.â Before focusing fully on startups and scaleups, Simon worked for several years as a creative within the wider Jung von Matt network and has long been active in the startup ecosystem as a mentor and speaker.


Kai Lentering
Strategy Director, Jung von Matt START
Workshop Host, Mentor
Kai is Strategy Director at Jung von Matt START who loves helping startups build their brand and set it up for growth. Before joining Jung von Matt START, Kai has gained extensive experience supporting numerous startups during his time at Project A â one of Europe's leading venture capital firms with âŹ1.2bn under management and 130+ investments into companies like Quantum Systems and Trade Republic. He will host a branding and marketing workshop on Saturday together with Malte and stay until the afternoon as a mentor.


Malte Wolf
Senior Strategist, Jung von Matt START
Workshop Host, Mentor
Malte is a brand strategist at Jung von Matt START. He worked for the fintech LIQID and as management consultant for innovation and digital growth at TLGG. Before joining Jung von Matt, he participated in the Antler Residency Program as well as the Vision Health Pioneers Incubator as a founder of his own startup. On Saturday, he will host a branding and marketing workshop together with Kai and remain available as a mentor until the afternoon.


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, which he claims are "actually sometimes really useful and worth sharing".


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.


Matthias HanĂmann
Startup Consultant, Haspa
Mentor
Matthias HanĂmann is a startup consultant in the StartUp-Center of Haspa. He supports startups in Hamburg on topics such as setting up company accounts, financing growth and structuring their business plans. He will join us as a mentor on Saturday afternoon and is especially looking forward to answer any questions about financial planning.


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
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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


