I'm a product engineer and founder, shipping software since 1999. My work spans consumer apps, ad-tech, blockchain infrastructure, and fintech.In Berlin, I founded proud magazine, an independent socio-political publication recognized by the DFJV and archived in the German National Library. I co-founded abend.net, an ML-driven ad optimization platform, and abend.com, a Facebook Events discovery app — together serving thousands of paying clients monthly.After passing the technical engineering interview from Facebook I decided to pass on that and became COO and CPO of the newly founded æternity Blockchain in 2017, I led product and operations, scaled the team to over 100 people, and contributed to Liechtenstein's Blockchain Act. 2022 I served as Chief Product Officer at Börse Stuttgart Digital Exchange, leading product for one of Europe's first regulated crypto trading platforms.I've been in Bitcoin since 2012 — early mining, visiting Room 77, and contributing to different Open Source projects.Now I'm building nuri.com. We acquired the Nuri brand after its insolvency, rebuilt the product from scratch, and launched the first and only passkey-derived and owned self-custodial Bitcoin wallet with non-custodial Visa card and integrated banking — live on iOS and Android across Europe, expanding to 100+ Countries with a Stablecoin VISA/Mastercard, onchain Euro IBAN and USD ACH account.

Emin Mahrt, Zanzibar, Tanzania.