Seeking Technical Co-Founder / Founding Engineer for Fintech Startup

Hi, I’m a solo founder from Sweden building Runda, a fintech startup focused on making saving money effortless. The concept is simple: Users connect their bank account through Open Banking, and every card purchase is automatically rounded up to the nearest whole amount. The spare change is then accumulated as savings. Example: * €4.60 purchase * Rounded to €5.00 * €0.40 saved automatically The goal is to help people build savings habits without changing their lifestyle. ⸻ Current Stage I have: * Product vision and roadmap * Pitch deck * Initial MVP specification * Market research completed * Research on Open Banking providers (Tink, Nordigen, etc.) I am now looking for a technical partner to help build the first MVP and shape the product from the ground up. ⸻ What I Am Looking For Ideally someone who: * Has experience with React / Next.js * Can work with APIs and backend systems * Understands authentication and security * Has an interest in fintech * Wants to build a startup, not just complete a project This could begin as a freelance engagement but my goal is to find someone interested in becoming a long-term technical co-founder. ⸻ MVP Scope Phase 1: * User onboarding * Savings dashboard * Round-up calculation engine * Transaction history * Savings goals * Responsive mobile-friendly design Initially, the MVP can use simulated transactions before integrating Open Banking. ⸻ Tech Stack (Flexible) * Next.js * TypeScript * Tailwind * Supabase * Vercel Open to suggestions. ⸻ Why Join? I am not looking for someone to simply write code. I am looking for a partner who wants to help build a company with long-term potential in the fintech space. If you’re interested, please send: * A short introduction * Relevant projects you’ve worked on * Your preferred tech stack * Whether you would be interested in a long-term founder journey Looking forward to connecting.