In July 2025, Greg Price contributed to the zulip/zulip repository by addressing a bug in the push notification pipeline. He developed a deduplication mechanism for APNs device tokens, ensuring that each device receives a single notification even when tokens are stored with different letter cases. This solution, implemented in Python and focused on backend development and push notifications, introduced the dedupe_device_tokens function to filter and normalize tokens before sending. By preventing duplicate push deliveries at the sending stage, Greg’s work improved user experience, reduced server load, and enhanced the reliability of Zulip’s push notification infrastructure during this period.