Saurabh Rajawat focused on security hardening and test coverage improvements for the tokamak-network/tokamak-thanos repository, specifically targeting L1 contract verification. He enforced that only externally owned accounts could perform L1 verification, refining the logic to block contract-based attempts and updating error messaging for proxy admin verification failures. Using Solidity and smart contract development skills, he expanded the test suite by introducing a helper contract to simulate unauthorized verification attempts, ensuring expected reverts were triggered. This work addressed a critical bug, reduced the risk of unauthorized contract interactions, and enhanced the robustness of the verification process through thorough testing and precise error handling.