Hannah Kromminga is the founder and CEO of SILFIR, a Berlin-based startup developing a gifting app for second hand clothing with the mission to eradicate clothing waste. Hannah started her career in the London start-up scene in 2010, where she went through three acquisitions of SaaS start-ups both founded in the UK and Silicon Valley. In 2017 she decided to fully immerse herself into developing and innovating in the emerging circular economy, both as a strat-up strategy consultant as well as with her start-up company SILFIR. SILFIR has since gone through a successful kickstarter campaign in 2019 raising €30K and winning the European Innovation Award for a circular design uniform. Recently the company has pivoted to the new clothing gifting app concept and is running an awareness campaign for pre-registrations through an interview series with change makers on

In May 2020, Hannah co-founded the Greentech Alliance.