During November 2024, Laia worked on the okx/xlayer-erigon repository, focusing on enhancing the reliability and security of ZK-EVM contract execution. She addressed a critical bug in the ModExp input validation path by tightening byte-length checks for the base, exponent, and modulus, ensuring that oversized inputs are rejected early. This backend development effort, implemented in Go and leveraging her expertise in cryptography and smart contracts, refined both the gas calculation and execution logic for modular exponentiation. Laia’s targeted fix reduced the risk of execution failures, improved contract safety, and reinforced the overall robustness of ZKEVM operations within the repository.