Carola Leiva is a standout product builder at Klaviyo, the CRM built for consumer brands, recognized for her ability to bridge the gap between “heavy science” and effortless user experience. While driving the experimentation and personalization product areas, Carola was the force behind sophisticated A/B testing and optimization features powered by LLMs and robust statistical modeling. She famously defined her product philosophy with the phrase “Click, Click, Done!”—reflecting her commitment to delivering intuitive interfaces that hide the immense complexity of the underlying data science backends.

The impact of Carola’s work is both massive and measurable, with her features driving an average 5–12% increase in signup form traffic and earning mentions in Klaviyo’s official case studies and earnings calls. Beyond the UI, her technical acumen was vital in navigating the commercial strategy of AI; she worked hand-in-hand with data scientists to balance user experience with data robustness, determining the optimal requirements for everything from generative subject line testing to large-scale hold-out group analysis. Her efforts helped tally hundreds of millions of dollars in “Klaviyo Attributed Value” (KAV), solidifying her reputation as a premiere builder in the Boston AI ecosystem.