During July 2025, Justin focused on backend reliability improvements in the sglang repository, addressing a complex bug in the DP Attention Global Forward Mode Determination logic for TBO. He enhanced the Python-based system by refining how idle and mixed-mode batches are handled, ensuring that ForwardMode.IDLE values are correctly filtered before global mode computation. This adjustment prevents incorrect defaulting in idle-only scenarios, reducing edge-case failures and improving downstream model behavior. Justin’s work demonstrated strong skills in backend development, performance optimization, and version control with Git, resulting in more robust forward-mode logic and increased reliability in production workflows.