Product Builder (Data&AI)

Hey there! We’re Fever , the world’s leading tech platform for culture and live entertainment. Our mission? To democratize access to culture and entertainment. With our proprietary cutting-edge technology and data-driven approach, we’re revolutionizing the way people engage with live entertainment. Every month, our platform inspires over 300 million people in +55 countries (and counting) to discover unforgettable experiences while also empowering event creators with our data and technology, helping them scale, innovate, and enhance their events to reach new audiences. Our results? We’ve teamed up with major industry leaders like Netflix, F.C. Barcelona, and Primavera Sound, presented international award-winning experiences, and are backed by several leading global investors! Impressive, right? To achieve our mission, we are looking for bar-raisers with a hands-on mindset who are eager to help shape the future of entertainment! Ready to be part of the experience? Now, let’s discuss this role and what you will do to help achieve Fever’s mission. We are looking for an AI Product Builder in Madrid: someone for whom thinking, designing, and building are not separate stages, but a single act. Someone who collapses the distance between idea and product until it becomes almost invisible. End-to-end, no intermediaries, no safe havens. You will work directly with the Data leadership and ship real impact from day one. About the role • Own consumer-facing AI products end-to-end: from identifying the opportunity, to designing the experience, to shipping the implementation, to measuring impact. No hand-offs. • Embed AI across the full consumer flow — discovery, recommendations, conversion, retention, support — using LLMs, agents, and modern AI tooling as a native part of the product, not as a feature. • Understand our business, our customers, our market, and the data behind our consumer product to delight users and achieve Fever's goals. • Move fast with strong opinions: form a hypothesis, build the smallest thing that proves or kills it, ship, learn, iterate. Treat shipping as the way to think. • Build prototypes and production-ready experiences yourself when needed, leveraging AI coding tools and modern development workflows to compress the idea-to-product cycle. • Define the right metrics, run experiments (A/B tests, offline evals, online evals for AI features), and continuously improve product and model performance. • Collaborate with stakeholders across Design, Growth, and the Tech team, working sid by side with a team of Software Engineers. • Translate broad, ambiguous opportunities into concrete, measurable bets, and make sharp prioritization calls under uncertainty. • Help shape the vision and strategy for AI in the consumer product, and bring it to life through what you ship. About you Basic skills and qualifications: • Bachelor's degree in Engineering, Computer Science, or a related field. • 3+ years of relevant experience building consumer-facing digital products end-to-end (as a builder, founder, full-stack PM, product engineer, or similar hybrid role). • Proven, hands-on experience integrating AI / LLMs into real products in production — not just prototypes or demos. • Solid experience in consumer products: you understand user behavior, funnels, conversion, retention, and what makes a consumer experience feel magical. • Strong technical fluency: comfortable understanding system architecture, prototyping with modern AI tools, working with APIs, and holding deep technical conversations with the engineering team. • Independent judgment and taste: you have your own criteria for what good looks like and defend it with arguments, not consensus. • Precision and speed: you ship quickly without losing rigor, and you treat being wrong fast as a way to get closer to the truth. • Strong quantitative and analytical skills — comfortable with data, metrics, and turning numbers into product decisions. • Proficiency in English; able to communicate complex technical and product ideas clearly to any audience, in writing and in person. • High sense of ownership, urgency, and drive in a fast-paced, ambiguous environment. Preferred skills and qualifications • Hands-on experience with the modern AI stack: LLM APIs (OpenAI, Anthropic, etc.), prompt engineering, RAG, evals, agentic workflows, and AI coding tools. • Experience designing and running evaluations for AI-powered features (offline and online), and reasoning about model quality, cost, and latency trade-offs. • Background in tech startups, or a strong willingness to operate inside a fast-moving, high-ambition tech company. • Track record of shipping products as a small team or solo: founder, early-stage employee, indie builder, or similar. • Strong product taste and design sensitivity — you care about how things feel, not just whether they work. • Experience formulating hypotheses, building lean validations, running A/B tests, and defining primary and guardrail metrics. • Strategic sense: ability to collaborate in defining where the consumer product and its AI surface area should go in the next 1–3 years. • Ability to build trust quickly across different levels of an organization and rally people around what you are building. Why join Fever You will have real ownership and visible impact. You will help shape products, systems, and capabilities that matter across the business. You will work in an environment that values ambition, adaptability, pragmatism, and execution. You will be surrounded by smart, driven people who care about building things that matter. Benefits & Perks Flexible schedule 2 days per week at the office 40% discount on all Fever events and experiences Health insurance from Day 1 English or Spanish Lessons Wellhub Membership Cobee (tax free allowance on restaurants and transport) Possibility to receive in advance part of your salary by Payflow Thank you for considering joining Fever. We cannot wait to learn more about you! If you want to learn more about us: Fever's Blog | Tech.Eu | TechCrunch Fever is committed to creating an inclusive and diverse workspace where everyone's background and ideas count. Our main goal is to find the best possible talent regardless of place of birth, racial or ethnic origin, gender, gender identity, religion, opinion, sexual orientation, disability, pregnancy, marital status, age or caring responsibilities. We encourage everyone to apply! If you require any kind of accommodation during the selection process please contact our Talent team so we can help you by providing a welcoming and seamless journey. If you want to know more about how Fever processes your personal data, click here Fever - Candidate Privacy Notice