Full Stack Growth Builder

Full Stack Growth Builder CAN YOU HELP US FIX THE WORLD'S MOST BROKEN SUPPLY CHAIN? 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 are 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 have saved 9 million items from landfill and tripled in size year-on-year. We have raised ~$50M from a16z, Y Combinator, Burda Principal Investments, HV Capital, and others, and have recently closed our Series B. Our advisors and private investors include operators behind 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 are looking for people who want to build something that matters, and move fast doing it. Sound good? Keep reading. ABOUT THE ROLE We are looking for a deeply technical, highly innovative Full-Stack Growth Builder to reinvent how customer lifecycle marketing drives growth at Fleek. This is not a traditional CRM role. You will architect the entire system, from data to strategy to execution, and treat AI as your default toolkit, not a nice-to-have. You will design smart CRM systems that determine who to contact, when, through which channel, and with what message, using real-time user signals and context. You will build rigorous experimentation frameworks to quantify the true incremental impact of lifecycle messaging and prevent over-attribution. And you will lead the adoption of AI-powered content generation and personalisation, balancing scale with quality and relevance. This is a marketplace scaling from thousands to tens of thousands of active buyers. The data infrastructure is being built in real time. If you get energy from building systems that learn, proving what actually works, and shipping at speed, this is the role. WHAT MAKES YOU A FLEEK GROWTH BUILDER? - Systems Architect: You do not just run campaigns. You design adaptive systems that decide who to message, when, through which channel, and with what content, and that get smarter over time. - AI-Native: You use AI as your default toolkit. Content generation, personalisation, segmentation, decisioning. You have built or implemented AI-driven systems, not just read about them. - Experimentation Obsessed: You think deeply about incrementality, holdouts, causal inference, and marginal impact. You have caught campaigns that looked good on surface metrics but had no real value. - Commercially Wired: You connect lifecycle outputs to business outcomes. You think in activation rates, retention curves, LTV, and revenue impact, not just open rates and clicks. - Comfortable with Ambiguity: Fleek's growth data is complex and evolving. You thrive when the data is messy, the tracking is not perfect, and you need to find the answer anyway. - Action-Oriented Communicator: You translate complexity into "here is what to do." Your stakeholders never have to guess what the data means. - Startup Pace: You have worked in environments where speed matters, where you ship systems that drive same-week de ... (truncated, view full listing at source)