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:
Olivia Moore - AI Applications Partner @ a16z
Abhi Arora - CEO @ Fleek (YC W22)
Sanket Agarwal - CTO @ Fleek (YC W22)
Jeremy Hindle - Co-Founder & CTPO at Custodian
Nicolai Eddy - Co-Founder & COO at NALA
Alex Nikityuk - Head of AI @ Fleek
Francisco Terpolilli - Cursor Ambassador 🤌
Bring a laptop and an idea. Leave with something real!
The Challenge: pick a track
🔍 Vision
Vision-language models for the hard parts of resale: cataloging, grading, authentication, defect detection, and visual search across millions of unique items.
🤖 Agents & LLMs
Agentic and LLM-powered tools for sourcing, pricing, negotiation, customer experience, and ops automation.
♻️ Circular Moonshot
Open 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 & breakfast
10:30 – Welcome from Fleek
11:00 – Build begins!
13:30 – Lunch
14:30 – Build + mentor office hours (Fleek eng team)
16:30 – Checkpoint
18:00 – Submission deadline
18:30 – Demos
20:00 – Awards
20:30 – Drinks & networking
Prizes
1st prize - 6 months Cursor ultra plan
2nd prize - 4 months Cursor ultra plan
3rd prize - 3 months Cursor ultra plan
What you'll get
A working demo built in a day
On-day Cursor credits
Direct mentorship from our team and judges
A room full of strong builders to work and network with
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
Laptop + charger
Cursor installed and signed in (download here)
Your GitHub
An idea (optional)
Partners
Hosted by: a16z × Fleek, at Fleek HQ
Powered by: Cursor
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