Android App Authentication Fix || Node.js, Java, MongoDB, ||

I need a skilled developer to finalize debugging and roll out for my Android mobile app's login and signup authentication. Currently, users are unable to register, and there are issues with authentication integration.

Requirements:
- Remove glitches from existing authentication modules
- Ensure frictionless email/password signup and login
- Core technologies: Node.js, Java

Ideal skills:
- Experience in mobile app authentication
- Strong debugging skills
- Proficiency in Node.js and Java

Login/ Authentication is required to be integrated ensuring there are no glitches from previous login/authentication, user login is ensured and user is routed to right screen pages post login

Looking for a reliable freelancer to help get this app ready for launch.