During their tenure, bb.github@vmmon.org developed the Mailbox Delivery Success Count feature for the Sovereign-Labs/sovereign-sdk repository, enhancing backend reliability analytics. They introduced a deliveries_count state variable in Rust, incremented on each successful mailbox delivery, enabling precise tracking for operational visibility and SLA monitoring. To maintain backward compatibility, they refactored the state struct by repositioning StateValue and leveraged auto-generated state accessors. The metric was renamed for consistency with existing delivery metrics, and code quality improvements clarified its purpose. This work demonstrated proficiency in Rust and backend development, laying a foundation for future analytics dashboards and improved monitoring capabilities.