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| Wong Yew Fai | 4439 | Civil | 2012-03-22 | YMW Consulting Engineers Pte. Ltd. |
| Wong Yew Wah | 1983 | Mechanical | 1983-09-27 | - |
| Wong Yew Yuen | 3824 | Electrical | 2003-06-24 | Calvary Projects & Consultancy |
| Wong Yit Hong | 4555 | Mechanical | 2013-10-17 | Belmacs Pte Ltd |
| Wong Yok Siong | 3687 | Civil | 2002-01-15 | RX Engineers |
| Woo Chin Shoon | 4700 | Mechanical | 2015-08-18 | KTP International Pte. Ltd. |
| Woo Kwan Wye | 4420 | Civil | 2011-10-20 | Building and Construction Authority |
| Woon Kok How Steven | 5353 | Civil | 2020-10-15 | AECOM Singapore Pte. Ltd. |
| Woon Tien Heng | 4312 | Mechanical | 2009-05-21 | Asiamec Engineers Pte. |
| Woon Wee Phong | 2402 | Civil | 1988-05-18 | JYC Consultancy Pte. Ltd. |
| Woon Wee Young | 4227 | Mechanical | 2007-06-14 | Azuri Engineers Pte. Ltd. |
| Wu Chuan | 1759 | Civil | 1982-04-30 | CWU Consulting Engineers |
| Wu Haozhou | 5270 | Electrical | 2019-10-17 | Conteem Engineers Pte Ltd |
| Wu Nan | 5157 | Civil | 2018-10-18 | SWN Consultants |
| Wu Qingwang | 5186 | Electrical | 2018-12-14 | Sensepower Pte. Ltd. |
| Wu Ruixin | 3875 | Civil | 2004-05-05 | WRX Engineers Pte. Ltd. |
| Wu Shihao | 5062 | Electrical | 2018-05-17 | SP PowerGrid Limited |
| Wu Xiaofeng | 4875 | Civil | 2017-05-22 | KTP Consultants Pte Ltd |
| Wu Yiming | 4632 | Civil | 2014-10-21 | TERS Consulting Pte Ltd |
| Xavier Teng Jay Jeff | 5912 | Civil | 2026-05-28 | Meinhardt Infrastructure Pte. Ltd. |
| Xie Hua | 4640 | Civil | 2014-10-21 | SJD Consultants Pte. Ltd. |
| Xie Sihan | 5782 | Civil | 2025-07-24 | WSP Consultancy Pte. Ltd. |
| Xing Yong | 4167 | Mechanical | 2007-03-15 | Arup Singapore Private Limited |
| Xiong Chuanyi | 5831 | Civil | 2026-01-22 | Worley Pte Limited |
| Xiong Wei | 5819 | Civil | 2025-11-27 | Arup Singapore Private Limited |
| Xu Chuanxi | 4419 | Civil | 2011-10-20 | CitySky Consultants Pte. Ltd. |
| Xu Da | 5110 | Civil | 2018-07-19 | Arup Singapore Private Limited |
| Xu Guanyu Henry | 5778 | Mechanical | 2025-06-19 | Defence Science and Technology Agency |
| Xu Mingfeng | 5625 | Mechanical | 2024-03-28 | Building and Construction Authority |