During January 2025, this developer contributed to the arceos-hypervisor/axvisor repository by implementing virtualized timer management within the VM monitor. They designed and integrated a timer list and refactored timer initialization into the hardware abstraction layer, establishing dependencies to support timer event registration, cancellation, and checks. This work, using Rust and system programming techniques, laid the foundation for deterministic guest timers and improved virtual machine scheduling. By aligning the timer subsystem with HAL boundaries, the developer enabled modular maintenance and future extensibility. Their focused engineering addressed core virtualization challenges in embedded systems, delivering a foundational feature without major bug fixes that month.