In 4.5 years, I joined 4 projects:The first project is the Proyek Gedung Mabes Polri Sisi Barat. In this project we became the main contractor, and I was assigned to be a commercial staff focusing on the material procurement, I control and order materials needed every day by colleagues in the field.My Second Project is Proyek MRT CP101-102, here PT. Wika Gedung as an architectural subcontractor for the Lebak Bulus, Fatmawati and Cipete stations. In this project I became a QS commercial staff, I was tasked with calculating the installed volume, the final account of other subcontractors, and submitting variation order work to our main contractor.My third Project is Proyek Kantor Bersama KCIC, here PT. Wika Gedung also as a subcontractor but working on the whole structure, architecture, mechanical and plumbing. In this project I was a QS also, focus handling foreman, make sure by checking real volume on site and matched it with the existing contractMy Fourth Project is Proyek Stasiun Integrasi LRT-HSR, located in Halim. PT. Wika Gedung also as a subcontractor working on the whole structure, architecture, mechanical and plumbing. But this time I was assigned as a commercial staff controlling project's budgeting every month and having responsibility to make and stored all administration of contract legal document for all project’s vendors