Proposal Engineer

Hydroleap; Singapore; On-site; SGD 60,000 - 110,000; Full time

Benefits offered by this job

Impactful water treatment work

Collaborative team environment

Growth opportunities

Job summary

Hydroleap is searching for a detail-oriented Proposal Engineer to translate customer requirements into compelling technical and commercial proposals for water and wastewater solutions. This hands-on role sits at the interface of Sales, Process/Application Engineering, Operations and internal teams.

You'll qualify enquiries, size treatment trains, develop CAPEX/OPEX models, prepare full proposals, manage deadlines, and hand over won orders with cost bases and risk registers, while contributing to

Qualifications

• 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 water/wastewater treatment, EPC, or related industry.
• Strong knowledge of water/wastewater treatment technologies and processes; exposure to electrochemical treatment is a plus.

Responsibilities

• Review enquiries, RFQs, and tender documents; assess technical feasibility and fit against Hydroleap's technology.
• Size the treatment train, including electrochemical reactor sizing, pre- 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.
• Write full technical and commercial proposals to a standard that minimizes rework; manage deadlines and tender portal requirements.

Skills

Project coordination

Technical writing

Editing

Cross-functional communication

Education

Bachelor's degree or higher in Environmental/Civil/Chemical Engineering

Tools

MS Office Suite

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.