Worked on stabilizing billing usage predictions in the librenms/librenms repository by addressing a DivisionByZeroError that could occur in the getPredictedUsage function during end-of-month billing cycles. The solution involved adding a guard to ensure the elapsed days value is always at least one, preventing crashes when the previous month has fewer days, such as in February. This fix improved the reliability of revenue forecasts and customer billing experiences. The work demonstrated strong backend development skills in PHP, with careful attention to edge-case date arithmetic, defensive programming practices, and clear, maintainable commit documentation to support ongoing project stability.