Water & Wastewater Proposal Design Lead

Gradiant; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Gradiant International Holdings Pte. Ltd. is seeking an Assistant Manager, Proposal & Design to drive competitive bids in water and wastewater projects.

You will craft technical and commercial proposals, perform process design, prepare cost estimates and coordinate across engineering, procurement, and project teams to win municipal and industrial contracts. The role requires strong process design capabilities, tender management experience, and collaboration with clients, consultants and vendors.

Qualifications

• Bachelor's degree in chemical, environmental, civil or mechanical engineering.
• At least 5 years of experience in water/wastewater design, proposals, or project engineering.
• Experience in municipal and industrial water/wastewater projects is highly desirable.
• Proven tender preparation and process design experience.
• Strong knowledge of UF/RO/MBR/MBBR, DAF, filtration, and clarifiers.

Responsibilities

• Develop technical and commercial proposals including EOI, budgets and firm bids.
• Review tender documents and client requirements to ensure compliance.
• Develop process designs, PFDs, P&IDs, sizing calculations and technical write‑ups.
• Coordinate inputs from engineering, procurement, finance and project teams.
• Support cost estimation, BOQ preparation and vendor evaluation.
• Prepare technical proposals and execution approaches with compliance matrices.
• Collaborate with Sales, Project Delivery and stakeholders to align solutions.

Skills

Water treatment design

Tender preparation

Process calculations

PFDs & P&IDs

Mass balance

Hydraulic modelling

Cross-functional collaboration

Excel proficiency

Mandarin preferred

Education

Bachelor's Degree in Chemical Engineering

Tools

AutoCAD

Process modeling software

Job description

Gradiant International Holdings Pte. Ltd. is seeking an Assistant Manager, Proposal & Design to drive competitive bids in water and wastewater projects.

You will craft technical and commercial proposals, perform process design, prepare cost estimates and coordinate across engineering, procurement, and project teams to win municipal and industrial contracts. The role requires strong process design capabilities, tender management experience, and collaboration with clients, consultants and vendors.