Senior Water & Wastewater Process Engineer — Hybrid & Impactful

New Zealand Government; Wellington; Hybrid; NZD 120,000 - 180,000; Full time

Benefits offered by this job

Flexible work arrangements

Up to 6 weeks extra annual leave

Volunteer and representation leave

Flex public holidays

Job summary

AECOM is recruiting a Senior Water & Wastewater Process Engineer to join our New Zealand team in Christchurch or Wellington. You will lead process engineering for water and wastewater projects, develop designs from concept to delivery and prepare reports and calculations.

You will collaborate with civil, mechanical, electrical, and instrumentation engineers, support commissioning and start‑up activities, and mentor junior engineers, ensuring project success across scope, budget and quality.

Qualifications

• Bachelor's degree in Chemical, Process, Environmental, Mechanical or Civil Engineering.
• Around 5+ years' experience in water and wastewater engineering.
• Strong experience in water and/or wastewater treatment process design.
• Experience developing process calculations, PFDs, P&IDs and treatment plant design documentation.
• Practical understanding of treatment plant operations and performance.
• Experience supporting commissioning, start‑up, optimisation or operational activities.
• Strong technical problem‑solving skills and attention to detail.
• Ability to communicate clearly and build relationships with clients and stakeholders.

Responsibilities

• Lead and deliver process engineering solutions for water and wastewater treatment facilities.
• Develop process designs from concept and feasibility through to detailed design and delivery.
• Prepare technical reports, feasibility studies, design calculations, specifications and supporting documentation.
• Contribute to the design and optimisation of complex treatment processes and facilities.
• Work alongside civil, mechanical, electrical, structural and instrumentation engineers to deliver integrated solutions.
• Support commissioning, start‑up, optimisation and operational troubleshooting where required.
• Provide technical guidance and mentorship to engineers developing their careers.
• Build trusted relationships with clients, operators and project stakeholders.
• Contribute to successful project delivery across programme, budget, quality and technical objectives.

Skills

Process engineering

Process design

Technical reporting

Mentorship

Client relationships

Education

Engineering degree (Chemical/Process/Environmental/Mechanical/Civil)

Tools

PFDs & P&IDs

Job description

AECOM is recruiting a Senior Water & Wastewater Process Engineer to join our New Zealand team in Christchurch or Wellington. You will lead process engineering for water and wastewater projects, develop designs from concept to delivery and prepare reports and calculations.

You will collaborate with civil, mechanical, electrical, and instrumentation engineers, support commissioning and start‑up activities, and mentor junior engineers, ensuring project success across scope, budget and quality.