Developed a reliability enhancement for the breez/spark-sdk repository by implementing an idempotent Renew Leaf gRPC operation using Rust. This feature introduced idempotency key support to renew leaf requests, enabling the backend to return cached responses and prevent duplicate processing during burst traffic. The approach leveraged backend development skills, gRPC protocol expertise, and caching strategies to reduce backend load and improve the predictability of renewals. All changes were tracked through a dedicated commit, reflecting a commit-driven workflow. The work addressed efficiency and reliability concerns, directly reducing incident risk and supporting more stable backend operations without introducing new bugs during the period.