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| Sahabdeen Mohamed Mohideen | 4593 | Tunnelling Engineering | 2022-09-29 | Infra Tech Professionals Pte. Ltd. |
| Satishkumar s/o Kurusamy | 4702 | Access Platform Engineering | 2017-08-22 | SK Inspection Pte. Ltd. |
| Satishkumar s/o Kurusamy | 4702 | Pressure Vessel Engineering | 2017-08-22 | SK Inspection Pte. Ltd. |
| Satishkumar s/o Kurusamy | 4702 | Lift and Escalator Engineering | 2017-08-22 | SK Inspection Pte. Ltd. |
| Satishkumar s/o Kurusamy | 4702 | Crane Engineering | 2017-08-22 | SK Inspection Pte. Ltd. |
| Seah Chia Kwee | 3715 | Lift and Escalator Engineering | 2019-08-15 | SCKSJH |
| See Kok Leng | 5415 | Lift and Escalator Engineering | 2025-02-27 | Chevalier Singapore Holdings Pte Ltd |
| Seow Foo Meng | 2207 | Lift and Escalator Engineering | 2018-02-13 | FM Engineering Services |
| Shaikh Ali B. Hassan Alkhatib | 2880 | Lift and Escalator Engineering | 2017-11-18 | CPG Consultants Pte Ltd |
| Shen Weijian | 4888 | Lift and Escalator Engineering | 2020-11-19 | TUV SUD A-Reliance Pte. Ltd. |
| Shen Weiyue | 4449 | Geotechnical Engineering | 2016-04-12 | ECAS Consultants Pte. Ltd. |
| Siew Seng Yeow | 5204 | Access Platform Engineering | 2019-03-21 | Ministry Of National Development (MND) |
| Siew Seng Yeow | 5204 | Lift and Escalator Engineering | 2023-02-23 | Building and Construction Authority |
| Siew Seng Yeow | 5204 | Amusement Ride Engineering | 2023-01-26 | Building and Construction Authority |
| Soh Seng Siong | 2371 | Tunnelling Engineering | 2021-09-23 | WSP Consultancy Pte. Ltd. |
| Soh Seng Siong | 2371 | Geotechnical Engineering | 2007-06-14 | WSP Consultancy Pte. Ltd. |
| Song Siak Keong | 2585 | Geotechnical Engineering | 2007-04-19 | CSAGE Consultants |
| Sun Jianping | 5343 | Geotechnical Engineering | 2024-06-27 | CHECC(Singapore) Pte. Ltd. |
| Tan Chee Keong | 5472 | Lift and Escalator Engineering | 2022-07-28 | Building And Construction Authority (BCA) |
| Tan Chin Gee | 3448 | Geotechnical Engineering | 2007-06-14 | RCY Pte. Ltd. |
| Tan Chin Nien Victor | 5412 | Pressure Vessel Engineering | 2021-06-24 | CASY Engineering Consultancy Pte Ltd |
| Tan Ee Ching | 4023 | Amusement Ride Engineering | 2011-02-17 | Hazard Control Engineering Pte. Ltd. |
| Tan Ee Ching | 4023 | Crane Engineering | 2017-11-18 | Hazard Control Engineering Pte. Ltd. |
| Tan Ee Ching | 4023 | Lift and Escalator Engineering | 2017-11-18 | Hazard Control Engineering Pte. Ltd. |
| Tan Ee Ching | 4023 | Access Platform Engineering | 2017-11-18 | Hazard Control Engineering Pte. Ltd. |
| Tan Eng Seng | 4380 | Crane Engineering | 2017-04-20 | Mecro Engineering Services |
| Tan Eng Seng | 4380 | Lift and Escalator Engineering | 2017-10-23 | Mecro Engineering Services |
| Tan Eng Seng | 4380 | Pressure Vessel Engineering | 2017-04-20 | Mecro Engineering Services |
| Tan Gek Buay Margaret | 3588 | Protective Security Engineering | 2018-08-16 | Home Team Science and Technology Agency |