During April 2026, contributed to both the carbon-language/carbon-lang and martinvonz/jj repositories, focusing on reliability and performance in version control workflows. Developed robust configuration improvements and added trunk reference support for jj in carbon-lang, enhancing repository management. In martinvonz/jj, replaced legacy ignore handling with gix-ignore integration, aligning pattern matching with Git standards and improving ignore processing efficiency. Optimized status and snapshot operations for large repositories by moving hash computations outside critical sections, reducing lock contention and wait times. Work utilized Rust, Git, and concurrent programming, emphasizing backend development and system programming to deliver faster, more reliable developer experiences.