During November 2025, Miller focused on backend stability for the sourcebot-dev/sourcebot repository, addressing reliability issues during large-scale Git repository synchronization. He implemented concurrency control using the p-limit library in Node.js, which limited simultaneous sync operations and prevented resource exhaustion under high load. By carefully managing backend resources and introducing robust testing, Miller reduced the risk of incidents during mass repository syncs and improved overall system throughput. His work, primarily in JavaScript and TypeScript, enabled safer scaling and enhanced stability for the synchronization process. This targeted engineering effort demonstrated depth in concurrency management and backend development within a production environment.