Rosie Hoggmascall is a London-based product and growth expert specialising in subscription apps, monetisation, and product-led growth. With a Cambridge education and a career spanning strategic communications to leading consumer tech startups, she is currently Chief Product & Growth Officer at Fyxer AI - an email productivity tool that grew from $1M to $30M ARR in 2025. She also runs 'Growth Dives', a weekly Substack newsletter delivering annotated product teardowns to 2,000+ subscribers with a remarkable 64% average open rate.
Klaviyo is a Boston-based AI-first B2C CRM platform that unifies email marketing, SMS, push notifications, and customer service into a single data-driven system. Founded in 2012 by Andrew Bialecki and Ed Hallen, it went public on the NYSE in September 2023 and crossed $1.2B in annual revenue in 2025, serving 193,000+ brands in 100 countries. Klaviyo's core edge is its built-in Customer Data Platform that manages 7.3 billion customer profiles and processes 2.5 billion events daily, enabling hyper-personalized marketing at scale for direct-to-consumer brands.