To ensure the security of user data in a real estate mobile app, developers can implement multiple things. Staring with end-to-end data encryption between app and server, two-factor authentication using one-time-password, Google Authenticator, using secure coding practices to prevent vulnerabilities such as SQL injection, and cross-site scripting. The real-estate app must comply with GDPR guidelines to protect users’ information and store only what is required. Further, we can do regular security audits, and stay updated with the latest security patches for all software libraries and third-party APIs and technologies used.