Biometric Attendance Management System: How to build it, which technologies to be preferred [on hold]

I want to build a biometric attendance management system, using a fingerprint sensor attached to a mobile with OTG support. I want to make a roadmap on how to build it. The whole idea is to build a cost-effective system for college. I am thinking of an android app, but I don't have the required knowledge about the working of fingerprint sensor and how to match it with the database. Any other suggestion would be highly appreciated.

Android         database         Cloud         fingerprints         biometrics        
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