This case study details the QA testing experience of Codecademy with test IO, a crowdtesting platform. It outlines the challenges faced by Codecademy prior to implementing test IO, particularly the difficulties in quality assurance (QA) processes and the frustrations of engineers when issues arose after extensive development work. Gareth Price, Engineering Manager at Codecademy, explains how the traditional QA methods were inadequate and how the crowdsourcing approach provided a fresh perspective on product testing. The document describes the transition to test IO, highlighting its agile and iterative testing capabilities compared to previous outsourced QA services. It emphasizes the benefits of using test IO, including the ability to submit simple test descriptions and receive comprehensive feedback quickly. The case study concludes with insights into the positive impact on the engineering team's efficiency and morale, as well as the overall improvement in product quality and user satisfaction since adopting test IO's services.