Full Stack AI Builder
Fleek · London · mid
Fleek · London · mid
The fashion industry produces over 100 billion garments a year. 60% end up in landfill, not because people don't want these clothes, but because the supply chain for getting secondhand fashion from donation to resale is completely offline, manual, and broken.
Fleek is fixing this. Our mission is to make secondhand the first choice. We're building the infrastructure powering the global secondhand clothing trade, through a B2B marketplace and the AI systems digitising the supply chain behind it.
Through Fleek, vintage stores, online resellers, and retail buyers source graded secondhand inventory directly from wholesalers and rag houses across multiple countries. Our key enabler is FleekSort, an AI model fine-tuned on secondhand fashion, that can grade, price, and categorise items with just a photo, turning what has historically been an opaque and manual trade into a structured, searchable, and tradable global inventory layer.
Since 2022, we've saved 9 million items from landfill while tripling in size year-on-year. We're backed by some of the world's best investors, including a16z, Y Combinator, and HV Capital, alongside world-class angels who helped build Depop, Shopify, and Postmates.
Today, we serve thousands of resellers and retailers across the UK, Europe, and the US. With the secondhand fashion market projected to reach $350B by 2027, Fleek is building the AI-native operational and financial backbone for secondhand commerce globally.
We're looking for people who want to build something that matters, and move fast doing it. Sound good? Keep reading.
We are looking for a deeply technical, hands-on Full-Stack Builder to embed across our AI and operations pods, building the agents, internal tools, and infrastructure that run Fleek end-to-end.
You will work alongside our CTO and Head of AI, jumping between teams to ship the systems that compound: agentic workflows that automate manual ops, internal tools that make every team 10x faster, and the connective tissue between our marketplace, our data, and our AI models. One week you might be building a sourcing agent for the commercial team. The next, productionising an integration with our warehouse partners. The next, hardening FleekOS — our internal operating system — so the next thing we build on it lasts.
This is the role for someone who has shipped real systems for 3-4 years, is bored of building the same thing in slightly different shapes at a big company, and wants range, ownership, and proximity to the part of AI that's actually useful right now: production agentic infrastructure inside a real business with real revenue.
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Fleek · London