January 2026 highlights for Mu2e/otsdaq-mu2e: Test Infrastructure Modernization and Stability/Observability improvements were delivered to improve test reliability, debugging speed, and maintainability. Key changes: 1) Test Infrastructure Modernization: Moved environment variable setup to a shared utility to streamline test initialization and improve maintainability (commit 12c07cae6300ff1564ef8a4c85b6d95eb1df3f3a). 2) Internal stability and observability enhancements: Introduced read/write operation timeout with ROC link ID logging for better debugging and user feedback; refactored DTC control register validation error handling by introducing a dedicated result code variable for clearer error state separation (commits 773cb005888c5d5181c6e6b6a5f8aa050a5ddead and e6732ef3398c6b1aeece9f115cfeae0b4d5f597e).

December 2025 monthly summary for Mu2e/otsdaq-mu2e. Focused on improving reliability and maintainability of DTC interactions by validating DTC control registers and strengthening error handling. Delivered a robust per-bit validation mechanism for DTC control registers, reducing the risk of misconfigurations and undefined states during register writes/reads, and provided clearer error reporting for debugging.

September 2025 monthly summary for Mu2e/otsdaq-mu2e. Delivered the CFO Sample Clock Edge Default Update as a key feature to stabilize CFO interface initialization and clock synchronization. Updated default from 2 (auto-find) to 0 (rising-edge) in DTCFrontEndInterfaceImpl.cc. Implemented via commit e92b9c029919a8a6b48a2efec7beda0237bbad16 ('Change CFO interface setup default'). Impact: Improved startup reliability of CFO timing, reduced initialization drift, and smoother data-taking readiness. Skills demonstrated: C++ code changes, interface configuration, clock-domain awareness, Git-based version control and change management.

June 2025 — Focused on delivering a robust CFO loopback testing capability in Mu2e/otsdaq-mu2e, with added software-controlled loops, ROOT output, multi-run capability, and statistical delay analysis; performed targeted code cleanups to improve maintainability and align with project standards. No major defects fixed this month; emphasis on feature delivery, maintainability, and reproducibility.