During September 2025, Kirill contributed to the anza-xyz/agave repository by implementing ReplicaBlockInfoV5 support for geyser plugins. He extended the block information structure with accounts_lt_hash, allowing plugins to access account state hashes and thereby improving replay fidelity and downstream analytics. His work involved updating Rust code in both the core replay stage and Cargo.toml manifests to support the new data version, ensuring seamless integration for plugin developers. Focusing on feature delivery rather than bug fixes, Kirill applied his expertise in blockchain, Rust, and system programming to lay the groundwork for enhanced plugin interoperability and richer state visibility within the project.