Fleek x a16z Hackathon London

Join Fleek and a16z for a one-day hackathon to build vision-language and LLM-powered tools that make circular fashion work at scale. Spend the day building with mentors from the Fleek product and engineering teams, ship a working demo, and compete for Cursor prizes. Secondhand is the fastest-growing corner of fashion - and the hardest to scale. Every item is one-of-a-kind: a single photo, no SKU, no clean data. New retail is a solved problem; secondhand is wide open. It's exactly the kind of messy, visual, real-world challenge that modern AI was built for. Judges: Bring a laptop and an idea. Leave with something real! The Challenge: pick a track 🔍 VisionVision-language models for the hard parts of resale: cataloging, grading, authentication, defect detection, and visual search across millions of unique items. 🤖 Agents & LLMsAgentic and LLM-powered tools for sourcing, pricing, GTM tooling, negotiations, customer experience, and ops automation. ♻️ Circular MoonshotOpen wildcard - anything that pushes the circular economy forward: impact measurement, waste reduction, or reimagining how people buy and sell secondhand. Agenda 9:30 – Doors open, check-in & breakfast10:30 – Welcome from Fleek11:00 – Build begins!13:30 – Lunch14:30 – Build + mentor office hours (Fleek eng team)16:30 – Checkpoint18:00 – Submission deadline18:30 – Demos20:00 – Awards20:30 – Drinks & networking Prizes What you'll get Who should join Engineers, ML/CV practitioners, designers, and founders who want to build AI for good products. Mid-to-senior engineers especially welcome. Come solo or with a team - we'll help solo builders find one. What to bring Partners FAQ Do I need a team? No - come solo or with up to four. We run team formation in the morning. How technical do I need to be? This is a builder's hackathon - you should be able to ship something in a day. Designers and PMs are welcome on teams. Who owns what I build? You own your work. Is it really free? Yes. Capacity is limited and registration is approval-based, so RSVP early. Accessibility / dietary needs? Tell us your dietary requirements when you register. We're hiring 👋 Fleek is actively hiring engineers, and this is the most fun way to meet the team. Check out open roles here: joinfleek.com/careers