Aqua Consultants is looking for an experienced Senior or Principal Process Engineer to strengthen our growing Water Engineering team. You’ll play a pivotal role delivering water and wastewater schemes for UK water companies, while also supporting wider utilities and infrastructure projects.
You will act as a trusted process engineering authority, leading the development of compliant, innovative and sustainable treatment solutions across the project lifecycle.
Key responsibilities:
* Provide expert process input into water and wastewater design and delivery
* Act as a process subject matter expert and technical leader within Aqua
* Carry out capacity assessments for treatment works and develop process options
* Undertake process calculations, gap analysis and consent compliance assessments
* Develop mass balances, P&IDs, control philosophies and commissioning strategies
* Lead and participate in HAZOP, HAZID and HAZCOM studies
* Assess potable water treatment, raw water deterioration and network risks
* Develop process solutions through outline and detailed design
* Produce high‑quality technical reports and design documentation
* Collaborate closely with costing and commercial teams to develop viable options
* Manage client liaison, progress reporting and technical coordination
* Support project delivery through troubleshooting, commissioning and optimisation
* Promote best practice in process design, safety, operability and environmental performance
* Mentor and develop graduate, consultant and senior engineers
* Attend stakeholder meetings, workshops and site visits across the UK
About You:
* Accredited degree in Chemical, Environmental or Process Engineering
* Chartered member of a relevant professional institution (essential)
* Strong experience within water and/or wastewater treatment
* Confident developing mass balances, optioneering studies and optimisation plans
* Experience working in multi‑disciplinary consultancy teams
* Excellent stakeholder, client and communication skills
* Able to lead technical workstreams and support project delivery
* Practical site experience (sampling/jar testing desirable)
* Able to consider carbon, sustainability and environmental impacts
* Comfortable working independently and providing technical leadership
* Full UK driving licence and right to work in the UK
What We Offer:
* Competitive salary + discretionary bonus
* Company pension & salary sacrifice scheme
* 25 days annual leave + bank holidays + option to buy more
* Company laptop and mobile phone
* Professional membership fees paid
* Ongoing training and clear career progression
* Life assurance (4x salary)
* Employee Assistance Programme (GP, physio & mental health support)
* Medicash healthcare cash plan
* Enhanced maternity, paternity and adoption pay
* Refer‑a‑friend incentive