Recording and managing student achievement at the Faculty of Engineering and Science, Universitas Muhammadiyah Purwokerto, is still done manually, which often causes inefficiency, delays, and the risk of errors in data management. This has an impact on the difficulty of accurately monitoring and reporting student achievement on time. To overcome this problem, this study aims to design and build a more efficient and integrated web-based student achievement information system. The system development method used is Extreme Programming (XP), which focuses on software development through short and fast iterations, and involves continuous feedback from end users. In addition, this system is equipped with automated testing to ensure the quality, reliability, and stability of the software. The result of this study is a web-based information system that allows centralized and real-time management of student achievement data. This system provides features to facilitate the process of recording, storing, reporting, and analyzing student achievement data. The system is also able to reduce manual errors and increase efficiency and accuracy in data management. In conclusion, the information system that was built successfully overcomes the problems of inefficiency and errors in managing student achievement data, and has the potential to be further developed with integration into other academic systems in the future.