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When Vu Van was struggling to learn how to pronounce words in English correctly as a grad student at Stamford, she couldn't have known that a passion for this problem would drive her to build a language learning app with millions of users just a few years later. In this episode Vu breaks down exactly how she managed the process of proving demand for her language app ELSA by getting 1000 users in just one week. She also walks us through how she tested with hundreds of early users in Vietnam to build a functional initial prototype that she used to attract one of the best minds in voice technology to join her as a CTO. See acast.com/privacy for privacy and opt-out information.