Rayhan has been part of the Ibu Kota Nusantara development project, precisely in the Garuda Palace building project, in this project Rayhan became a Site Engineer responsible for the scope of work on the building structure, Garuda facade and building interior. Rayhan became a bridge between Financing-Operational-Engineering in the scope of work above. Rayhan is very happy to work hard to achieve project success in the BMW aspect (Biaya, Mutu, Waktu) with benefits in terms of cost, achieved in quality and completed on time.Rayhan is passionate in gaining knowledge about construction and working in construction. His final report is about the performance evaluation of dry mix concrete beam and lightweight concrete beam, by comparing the results of their curvature moments, their stiffness graphs, their stress block diagrams, and their crack patterns.