Worked on the aws-greengrass/aws-greengrass-lite repository to enhance service startup reliability by implementing precise dependency ordering for system components. Focused on improving boot determinism, the work involved updating systemd unit files using C programming and service management skills to enforce After= semantics, ensuring that components only start once their required dependencies are fully ready. This approach addressed potential race conditions and prevented stale state reads during initialization. By aligning the TokenExchangeService unit with greengrass-lite.target and refining dependency modeling, the changes contributed to more predictable and unified startup behavior across deployments, demonstrating depth in systemd configuration and service orchestration.