Worked on enhancing security for the HabitRPG/habitica repository by delivering a secure encryption upgrade focused on modern cryptographic standards. The project involved migrating from AES-256-CTR to AES-256-GCM, ensuring authenticated encryption to protect both confidentiality and integrity of user data. Using Node.js and JavaScript, the developer implemented a unique initialization vector for each operation, addressing a cryptography bug that previously allowed IV reuse. This approach strengthened the repository’s data protection and reduced the risk of data leaks. The work demonstrated a strong understanding of back end development and cryptography, resulting in a more robust and compliant security posture.