Measuring the performance of remote developers can be challenging, but there are several methods that can be used:

1. Setting clear goals and expectations: Establishing clear goals and expectations for the developer’s role and responsibilities can help ensure that performance is measured consistently and accurately.
2. Regular check-ins and progress reports: Regular check-ins and progress reports can help managers stay informed about the developer’s work and identify any issues or concerns early on.
3. Tracking work hours and output: Use tools like time tracking software to monitor the hours remote developer worked, and the output from their work.
4. Code reviews: Having regular code reviews with the developer can help managers assess the quality of their work and identify areas for improvement.
5. Communication and collaboration: Assessing how well the remote developer is communicating and collaborating with other team members and stakeholders can provide insight into their overall performance.
6. Performance metrics: Setting specific performance metrics for the remote developer, such as the number of bugs fixed or lines of code written, can provide a quantitative measure of their performance.

It’s important to keep in mind that remote work can have some specific challenges, such as lack of face-to-face interaction and time zone differences, so it’s important to adapt the way of measuring performance to suit the remote context