Proposal Engineer

Hydroleap; Singapore; On-site; SGD 90,000 - 140,000; Full time

Job summary

Hydroleap in Singapore seeks a detail-oriented Proposal Engineer to craft high-quality technical and commercial tenders for water and wastewater solutions. You will bridge Sales, Process Engineering, Operations, and other teams to translate customer needs into compelling proposals.

You’ll size treatment trains, develop cost models, manage deadlines, and ensure compliance with gate processes. This hands-on role rewards technical depth, disciplined tendering, and continuous improvement through

Qualifications

• Bachelor's degree or higher in Environmental, Civil, Chemical Engineering or related field.
• 3–7 years in a proposal, tendering or applications engineering role in water/wastewater or EPC.
• Solid knowledge of water/wastewater treatment technologies; exposure to electrochemical treatment is a plus.
• Ability to read P&IDs, process flow diagrams, and technical specs; build CAPEX/OPEX models.
• Strong writing, editing, and document management skills.
• Comfortable meeting tight deadlines and handling multiple proposals.

Responsibilities

• Review enquiries, RFQs and tender docs; assess feasibility against Hydroleap tech.
• Size treatment train and translate pilot results to full-scale design assumptions.
• Prepare process flows, mass balances, and design inputs with the design team.
• Develop BOMs, obtain vendor quotes, and build CAPEX/OPEX models.
• Write and manage full technical and commercial proposals to submission standards.
• Coordinate deadlines and respond to clarifications during negotiation.

Skills

Project coordination

Technical writing

Editing

Cross-functional communication

Risk assessment

Education

Bachelor's degree or higher in Environmental Engineering, Civil Engineering, Chemical Engineering, or related field

Tools

MS Office Suite

Proposal software/estimating tools

Job description

Hydroleap is looking for a detail-oriented Proposal Engineer to prepare high-quality technical and commercial proposals for our water and wastewater treatment solutions. Sitting at the interface between Sales, Process/Application Engineering, Operations, and other internal teams, you will translate customer requirements and technical designs into compelling, accurate, and competitive proposals. This is a hands-on engineering role for someone who enjoys both the technical depth of water treatment processes and the discipline of winning tenders.

Key Responsibilities

Enquiry qualification and scoping

• Review incoming enquiries, RFQs, and tender documents; assess technical feasibility and fit against Hydroleap's technology.
• Interrogate client-supplied water quality data (COD, BOD, TSS, TDS, conductivity, pH, hardness, flow profiles) and identify gaps that need clarification before pricing.
• Make and document bid / no-bid recommendations.
• Select and size the treatment train, including electrochemical reactor sizing, pre-treatment and post-treatment stages, and sludge handling.
• Translate pilot and jar test results into full-scale design assumptions.
• Prepare process flow diagrams, mass balances, and general arrangement inputs with the design team.
• Define scope of supply, battery limits, exclusions, and deviations against client specifications.

Costing and commercial modelling

• Build bills of materials and obtain vendor quotations for equipment, instrumentation, and installation.
• Develop CAPEX build-ups and OPEX models covering power, consumables (electrodes, chemicals), sludge disposal, and maintenance.
• Apply margin and contingency in line with internal guidelines and flag commercial risk to the Engineering Manager and CFO.

Proposal production

• Write the full technical and commercial proposal document to a standard that requires minimal rework before submission.
• Manage submission deadlines, tender portal requirements, and document compliance.
• Respond to client technical clarifications and revise offers through the negotiation cycle.
• Attend techno-commercial meetings with clients alongside sales.

Handover and continuous improvement

• Hand over won orders to Project Management with the full cost basis, assumptions, and risk register intact.
• Maintain a proposal library — reusable technical content, cost benchmarks, and vendor pricing.
• Track win/loss outcomes and feed lessons back into pricing and design assumptions.
• Operate within Hydroleap's Proposal-to-Commercialisation gate process.

Requirements

• Bachelor's degree or higher in Environmental Engineering, Civil Engineering, Chemical Engineering, or a related field.
• 3–7 years of experience in a proposal, tendering, or applications engineering role within the water/wastewater treatment, EPC, or related industry.
• Solid working knowledge of water and wastewater treatment technologies and processes; exposure to electrochemical treatment is a plus.
• Ability to read and interpret P&IDs, process flow diagrams, and technical specifications, and to build CAPEX/OPEX cost models.
• Strong project coordination, technical writing, and editing skills.
• Proficient in MS Office Suite; experience with proposal, estimating, or document management tools is a plus.
• Comfortable working under tight deadlines and managing multiple proposals simultaneously.
• Strong cross-functional communication skills, with the ability to bridge technical and commercial conversations.

What We Offer

• The opportunity to work on innovative water treatment technology with real environmental impact.
• A collaborative, fast-moving team environment across engineering, sales, and operations.
• Competitive compensation and growth opportunities within a scaling company.