Jon Gabriel Castillon

Licensed Civil Engineer with a solid foundation in structural and architectural works, and over 4 years of hands-on experience in high-rise and large-scale commercial projects. As an aspiring estimator, I specialize in leveraging my field experience to provide precise material take-offs and cost tracking with background in using the planswift and bluebeam software. Known for being an efficient and adaptable team player.

Passionate about continuous improvement and delivering projects on time and strictly within engineering standards, while maintaining strict adherence to budgetary parameters.

Project Engineer at Chrey Builders Corporation (2025-05 – Present)

• Served as Project Engineer for The Positano Residences project, managing daily site operations and ensuring actual quantity compliance in line to the approved BOQ of the project, while closely forecasting and tracking material quantity estimates to avoid overruns and updating QTOs using bluebeam software.

Lead Formworks & Concrete Engineer at Premium Megastructures Incorporated (2024-05 – 2025-05)

• Lead Formworks and Concrete Engineer for the Mactan Newtown Convention Center project, ensuring structural integrity onsite and monitoring/updating items on the BOQ and the outdated quantity take offs using planswift, enabling precise execution of formworks and concrete, driven by accurate material take-offs and utilization monitoring.
• Executed concrete engineering estimates rescue and remediation at Firenze Residences project in Iloilo City, optimizing concrete quantity using planswift, which directly contributed to cost-saving measures.

Cadet Engineer - Area In Charge at Monocrete Construction Philippines Incorporated (2021-09 – 2024-04)

• Mandani Bay Quay (Tower 1): Served as Area in Charge overseeing ongoing structural works onsite while also meticulously tracking actual estimates vs. bid estimates, and managing resource allocation to match said projected estimates on the final BOQ.
• Lucima Residences: Acted as Formworks Engineer; assessed, estimated, delivered, and monitored formworks materials across the site including Shoring jacks, Landing Pads, ACS, Jumpforms, and AVD, effectively minimizing material wastage and improving overall cost efficiency.
• Ultima Residences: Completed critical architectural quantity balances and finalizing works on the site as Area in Charge, taking responsibility for closing out final project quantities and final account documentation.
• Nustar Integrated Resort and Casino: Managed architectural works specifically focusing on plastering and wall partition and interior painting quantity estimates and site installations on each floors.

Site Engineer (OJT) at Acea Engineering Services (2018-03 – 2018-05)

• Conducted routine site visits and office work to align staff with the project workflow.
• Oversaw Quality Assurance and Quality Control (QA/QC) on rebar and formworks, assisting in preliminary material quantification.

Bachelor of Science in Civil Engineering – University of San Jose – Recoletos (2015 – 2020)

Primary Education – Saint Mary's Academy of San Nicolas (2005 – 2011)

Secondary Education – Saint Mary's Academy of San Nicolas (2011 – 2015)