During September 2025, Andrey Zaitsev focused on maintainability and process improvement across AdguardTeam repositories. He enhanced the AdGuard Browser Extension MV3 documentation in the KnowledgeBase repository by clarifying rule application order and removing outdated references, using Markdown to ensure clarity and accuracy. In the HostlistsRegistry repository, he centralized Node.js version checks by moving validation logic into the compose file, standardizing environment enforcement during startup and build processes. His work leveraged JavaScript and DevOps practices to streamline build automation and documentation workflows. The updates addressed internal consistency and developer experience, with no user-facing bugs reported during this period.