Integrate Configurable Fingerprint Authentication in Flutter App 3

I am looking for a Flutter developer to add a fingerprint recognition feature into my existing mobile app. The current authentication method is username/password based, and I want the fingerprint authentication to be configurable by the user in the settings.

Key Requirements:
- Implement a secure and efficient fingerprint recognition feature.
- Ensure the fingerprint login is optional for users but easily accessible in the settings.
- Keep the existing username/password method intact.

Ideal Skills:
- Proficiency in Flutter and Dart.
- Previous experience implementing biometric authentication in mobile apps.
- Strong understanding of secure coding practices.

Please provide examples of similar projects you've completed in your proposal.