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Design & Estimation Engineer

Dubai, United Arab Emirates

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About the Role

We are seeking an experienced and highly motivated Design & Estimation Engineer with a strong background in water and wastewater treatment systems. The ideal candidate will be responsible for developing process designs, preparing cost estimates, and delivering technically sound and commercially competitive proposals for a wide range of treatment plants.

This position requires a hands-on engineer capable of independently evaluating client requirements, developing optimized treatment solutions, and supporting projects from proposal stage through execution.

Key Responsibilities

Process & Engineering Design

  • Design and develop water and wastewater treatment systems, including MBBR, MBR, SBR, ASP, ETP, STP, UF, RO, and tertiary treatment systems.

  • Prepare and review:

    • Process Flow Diagrams (PFDs)
    • Piping & Instrumentation Diagrams (P&IDs)
    • Hydraulic calculations
    • Equipment sizing and process calculations
    • General arrangement and process layouts
  • Select and specify equipment including pumps, blowers, membranes, filters, chemical dosing systems, and sludge handling equipment.
  • Ensure compliance with local regulations and internationally recognized engineering standards.

Estimation & Proposal Engineering

  • Review RFQs, tender documents, specifications, and client requirements.
  • Develop optimized technical solutions and treatment schemes.

  • Prepare:

    • BOQs and BOMs
    • Cost estimates and pricing sheets
    • Technical submittals
    • Techno-commercial proposals
  • Evaluate vendor quotations and coordinate with suppliers to obtain competitive pricing.
  • Support tender submissions and clarify technical and commercial aspects as required.

Project & Stakeholder Coordination

  • Coordinate closely with Sales, Procurement, and Project Execution teams during proposal and implementation stages.
  • Participate in client, consultant, and contractor meetings for technical discussions and clarifications.
  • Provide engineering support during commissioning and troubleshooting when required.
  • Contribute to standardization and continuous improvement of design and proposal processes.

Qualifications & Experience

  • Bachelor's Degree in Chemical, Environmental, Mechanical, or Civil Engineering.
  • 3–7 years of relevant experience in the design and estimation of water and wastewater treatment plants.
  • Proven experience preparing technical proposals and cost estimates for STP, ETP, WTP, and RO systems.
  • Strong understanding of biological treatment processes, membrane technologies, filtration systems, chemical dosing, and sludge treatment.
  • Ability to independently interpret specifications and develop practical treatment solutions.
  • Experience working with EPC contractors, system integrators, or water treatment companies will be an advantage.

Technical Skills

Software & Tools

  • AutoCAD
  • Advanced MS Excel
  • BioWin and/or GPS-X
  • WAVE and/or ROSA

Technical Expertise

  • Wastewater Treatment Plant Design
  • Water Treatment and RO Systems
  • Biological Treatment Processes (MBBR, MBR, SBR, ASP)
  • Ultrafiltration and Membrane Systems
  • Chemical Dosing Systems
  • Sludge Dewatering and Handling Systems
  • Hydraulic Calculations and Equipment Sizing
  • Cost Estimation and BOQ Preparation
  • Technical Proposal and Tender Documentation

Desired Attributes

  • Strong analytical and problem-solving abilities.
  • Excellent technical writing and communication skills.
  • Commercial awareness and attention to detail.
  • Ability to manage multiple proposals and deadlines simultaneously.
  • Self-driven, organized, and capable of working independently as well as within cross-functional teams.

What We Offer

  • Competitive salary package and performance-based incentives.
  • Opportunity to work on diverse and challenging water and wastewater projects.
  • Long-term career growth into Senior Design Engineer, Proposal Manager, and Engineering Leadership roles.
  • Collaborative and professional work environment with opportunities for continuous learning and development.


📩 Interested candidates may email their CV to hr@aaron.ae with the subject line:

"Application – Design & Estimation Engineer (Water & Wastewater Treatment)"

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