Worked on the Bitwarden iOS repository to enhance authentication integrity and device-based security, focusing on WebAuthn and passwordless workflows. Developed new passkey models and improved authenticator naming to align with the vault identity model, using Swift and Keychain Services for secure data handling. Introduced a foundation for device authentication key management by integrating device authentication keys into the keychain repository and creating a stub service to support secure device-based login. These efforts streamlined passwordless sign-in, improved the security posture of the app, and established scalable architecture for future enterprise-grade device trust and key management features, emphasizing robust software architecture.