Explore the journey of creating a secure and private web-based period tracker in this conference talk from JSConf Budapest 2019. Delve into the challenges and considerations of developing a cycle tracking application that prioritizes user privacy, data encryption, and multi-device access. Learn how a full-stack developer tackles the complexities of building a period tracker that doesn't compromise personal information or push data to third parties. Gain insights into the technical aspects and potential solutions for creating a privacy-focused web application, while considering the balance between functionality and data security.