A -factor authentication () developer designs, implements, and maintains secure authentication systems for applications or networks. They work on creating the primary layer of security by requiring users to provide two different authentication factors to verify their identity. Usually, this involves combining something the user knows (like a password) with something they possess (like a mobile device). The developer ensures the system operates smoothly, promptly identifies and fixes any issues, and constantly updates the system to prevent security breaches. They also collaborate with other developers to integrate into existing systems and educate users about its importance.