The 15% rise in signups at Codecademy could be due to several factors. For example, Codecademy may have introduced new courses that are in high demand, such as those related to trending technologies like Machine Learning, AR/VR, or Blockchain, which are relevant to current job market needs. Additionally, the significant job losses resulting from the pandemic may have prompted many individuals to seek to upskill or reskill, directing them to platforms like Codecademy. Finally, improvements in user experience or enhancements to the platform could have made learning more accessible and personalized, thereby attracting greater user engagement.