Fleek - Full Stack AI Builder
Requirements
• 3-5 years of professional engineering experience. You have shipped production systems and learned what breaks. You are not a junior, but you are still hungry to learn fast. • Strong full-stack chops. Comfortable across backend, frontend, and the glue in between. Specific languages matter less than the ability to pick up new ones quickly. • Hands-on experience building with AI. Production work with LLMs, agents, retrieval, or AI-driven features. Not theoretical. • Startup or scale-up experience. You have worked somewhere with fast cycles, evolving infrastructure, and high ownership. Or you have built your own thing and shipped it. • A bias toward shipping. You finish what you start, and you know how to make something good enough to ship rather than perfect and unshipped. • Experience with TypeScript, Python, and modern frontend frameworks (React, Next.js) • Familiarity with data warehousing tools (BigQuery, Snowflake, dbt) and event pipelines • Experience building internal tools or developer platforms • Open source contributions or a public portfolio of side projects • Background in B2B SaaS, marketplace, or supply chain products • Ready to build the systems that run one of the fastest-growing marketplaces in Europe? If you want range, ownership, and a front-row seat to AI-native infrastructure in production, we would love to hear from you. • Fleek is an in-office company. We believe the best work happens when people are together, the quick decisions, the cross-functional energy, the ability to solve problems in real time. Most of the team works from our London HQ 4-5 days a week. • The Practicalities • Location: London HQ, Commercial St, E1 (Liverpool St / Aldgate) • Work model: In-office, typically 4-5 days per week. • Stage: Post-Series B, hyper-growth • Team: 100+ across London, India, and Pakistan (~20 in London office) • Culture: High ownership, non-hierarchical, fast-moving. Founder-led with strong opinions loosely held. • Five values shape how we work at Fleek: • Dream Big and Disrupt Yourself: Push the most ambitious version of what you are building. Step out of your comfort zone. Nothing is out of reach. • Absolute Ownership: The buck stops with you. Drive initiatives to completion. Experiment, learn, persevere. The job is not done until the job is done. • Curiosity Leads the Way: Do not accept anything at face value. Ask questions you do not know the answer to. That is how you innovate. • Talk to the Customer: Deeply understand their challenges, motivations, and ambitions. Every decision starts with the customer at the centre. • Embrace Diversity: A global team building for a global supply chain. Bring your authentic self and embrace the diversity of everyone you encounter.
Responsibilities
• Build Across Pods: Embed with different teams (commercial, ops, supply, product) to build the tools and agents they need. You are not assigned to one squad. You go where the leverage is. • Ship Production Agents: Design and ship agentic systems that automate real work. Sourcing, classification, customer ops, internal workflows. Things that need to run reliably and not break when the on-call engineer is asleep. • Extend FleekOS: Contribute to and improve our internal operating system, the platform every team uses to build their own tools. Make it more reliable, more extensible, easier for non-engineers to build on top of. • Own End-to-End: Take features from "someone mentioned a problem in Slack" through scoping, building, shipping, and iterating. You own the outcome, not just the code. • Maintain What You Build: Treat reliability and maintainability as first-class. The reason this role exists is that things built without engineering rigour don't last. Yours will. • Stay Ahead: Track what's actually working in agent infra, internal tooling, and AI-native development. Turn new ideas into production systems before they become trend pieces.
Benefits
• Annual base £65K – £75K • 0.03% – 0.05% • Upload your resume here to autofill key application fields. • Drop your resume here! • Parsing your resume. Autofilling key fields... • or drag and drop here • I am a UK/Irish Citizen or have Indefinite Leave to Remain (I already have the permanent, unrestricted right to work). • I hold a valid visa that grants me the legal right to work without sponsorship (e.g., Skilled Worker under another employer, Graduate Visa, Ancestry Visa). • I will require visa sponsorship from the company to obtain the legal right to work in the UK. • Please share one example of how you have used AI to 10x your output. We want to see how you actually work, not just that you know the buzzwords.
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