In May 2025, Alex Barnard focused on stabilizing the SSE server for the modelcontextprotocol/rust-sdk repository by addressing a resource leak that occurred when clients disconnected. He implemented a solution using Rust and the Tokio async runtime, where a background task monitored each client's sender channel and triggered cleanup upon closure. This approach ensured that server-side sessions were properly removed from the transaction store, preventing leaks and improving scalability under high client churn. Alex demonstrated depth in backend development and concurrency, applying transactional session management and async patterns to enhance server reliability and maintainability in a production Rust environment.