During December 2024, Chien Minh Nguyen developed the CalcAmountIn function for the KyberNetwork/kyberswap-dex-lib repository, focusing on backend development for DeFi applications. He implemented this feature in Go, enabling accurate calculation of input token amounts required to achieve a specific output across multiple liquidity sources, including the Kyber-pmm pool simulator and Hashflow-v3. His approach incorporated inventory and limit checks to prevent over-swapping, along with robust error handling for insufficient liquidity scenarios. Chien also designed and executed comprehensive unit and integration tests, ensuring the reliability and correctness of the new functionality. The work demonstrated depth in smart contract integration and testing.