Harry Coultas Blum, Founder of Fluxions and former AI Engineer at Spotify, takes us inside the evolution of AI voice technology and what it now means for product teams, founders and modern businesses. Harry has worked at the forefront of speech AI. At Spotify, he helped build state-of-the-art voice systems capable of hyper-realistic speech and contributed to deploying AI-powered features to millions of users. Prior to that, he was part of the core team at Sonantic, engineering emotionally expressive voice models before the company’s nine-figure acquisition. In this session, Harry will trace how AI voice models have evolved, from earlier speech systems through to the more responsive, context-aware models now shaping the field. He will explain what has changed, why it matters, and how advances in speech AI are opening up new possibilities for product experiences, customer interaction and agentic interfaces. The talk will then move from history into application, looking at what it actually takes to add AI voice into a product. Harry will explore where voice agents are already being deployed, tested and improved inside live environments, what makes them feel natural and useful, and the practical considerations teams need to think through before introducing voice into their own products. He will also unpack what leaders should monitor as adoption grows, including user behaviour, quality, trust and churn signals. The session will touch on what truly matters in speech systems today, what Fluxions is currently building, and how this research is being conducted at the frontier. This is a grounded, technically credible session for founders, product leaders and engineers who want to understand how AI voice has evolved, where it is going next, and how to apply it responsibly and effectively inside real products.