Preston Evans focused on backend development for the Sovereign-Labs/sovereign-sdk repository, addressing a critical issue with header cache integrity during bulk synchronization. Using Rust, Preston engineered a concurrency-safe solution that stabilized cache behavior under heavy sync loads, preventing corruption and ensuring data consistency. The work involved refining the background poller to avoid filling or draining the finalized header cache at inappropriate times, directly improving performance and reliability during large-scale operations. Although the period included no new features, Preston’s targeted bug fix demonstrated depth in backend systems and concurrency management, aligning technical improvements with the project’s goals for robust data handling.