Job Description
Location: WE HAVE THREE OPPORTUNITIES, located in London / Glasgow / Tamworth
Employment Type: Full-time, 37.5 hours per week Mon – Fri
Salary: Competitive and DEFINITELY NEGOTIABLE – here is a basic outline of our salary offerings:
Associate 60k – 70k – Chartered + 12-Years Experience
Principal – 55k – 60k – Chartered + 10-Years Experience
Senior – 45k – 55k – Nearing Chartership + 5-Years Experience
Reports to: Company Director
A growing design and consultancy firm supporting the water sector with high-quality, future-focused solutions. We’re now looking for a skilled and motivated Senior to Associate Level Process Engineer to join our team, specialising in sewage treatment works (STW).
Role Overview
As a Senior, Principal or Associate Process Engineer, you’ll lead or contribute to the development of process designs for wastewater treatment projects from concept to detailed design stages. You’ll be responsible for producing core design documentation – from Process Flow Diagrams (PFDs) to Control Philosophies – and play a key role in interfacing with mechanical, electrical, and civil teams. You’ll also help define the commercial scope and technical deliverables, and support junior engineers as the team expands.
This is a hands-on design role requiring solid understanding of biological, chemical, and physical treatment processes, combined with the ability to communicate clearly, draft drawings, and deliver high-quality documentation on time.
Key Responsibilities
Technical Design & Delivery
Lead or support the process design of sewage treatment works across feasibility, outline, and detailed design phases
Develop and review key documents including:
o Process Flow Diagrams (PFDs)
o P&IDs
o Mass and energy balances
o Process calculations and sizing
o Control philosophies
o Design Basis Reports (DBRs)
o Commercial and technical scope documentation
Ensure alignment of process design with client specifications, standards (WIMES, etc.), and regulatory requirements
Provide CAD support: competent in using CAD software to draft and edit PFDs, P&IDs, and layouts
Contribute to the development of digital process design templates and standards
Assist in or lead multi-disciplinary design reviews and HAZOPs
Project Support & Coordination
Work closely with mechanical, electrical, civil, and ICA teams to ensure integrated design
Support or lead technical engagement with clients, stakeholders, and contractors
Participate in design coordination meetings and ensure timely delivery of process-related documentation
Prepare and contribute to tender documents, BoQs, and proposal submissions
Track scope, risks, and deliverables across the project lifecycle
Mentoring & Development
Provide guidance and support to graduate and junior engineers
Promote knowledge sharing and design best practices across the process team
Contribute to internal training materials and technical development initiatives
Qualifications & Experience
Degree in Chemical Engineering or Process Engineering (essential)
Chartered Engineer (CEng) with IChemE or equivalent (essential)
Minimum 7+ years of relevant experience in wastewater or sewage treatment works design
Proven track record in developing full process design documentation (PFDs, P&IDs, control strategies, etc.)
Experience working with UK water companies and frameworks (AMP cycles) preferred
Strong understanding of biological and chemical treatment processes, sludge treatment, and odour control
Proficient in AutoCAD or similar software (essential)
Familiarity with industry standards such as WIMES, Sewers for Adoption, etc.
Strong written and verbal communication skills
Able to work independently and collaboratively in a multi-disciplinary environment
Why Join This expanding business?
Join a growing, technically-led consultancy with a clear vision and strong project pipeline
Opportunity to shape the direction of our process design capability and team
Work on exciting and meaningful projects in the water and wastewater sector
Flexible/hybrid working options and a supportive team culture
Competitive salary, chartership support, and opportunities for progression
