Technical Process Design Manager

Join Mitie – the future of high performing places.

ROLE: Technical Process Design Manager
LOCATION: UK Wide Role
CONTRACT: Full Time

At Mitie, our people are our greatest strength, and our promise is to create places where people can thrive and be their best every day. We’re looking for a Technical Process Design Manager to join our growing wastewater engineering team, playing a key role in designing and optimising industrial effluent treatment systems across a diverse project portfolio.

Mitie is an accredited Real Living Wage Employer, ensuring all roles are paid at or above the independently calculated Real Living Wage.

Role Responsibilities

• Design full industrial effluent treatment plants from feasibility through to detailed design.
• Develop and optimise process flow diagrams (PFDs) and P&IDs.
• Specify equipment including pumps, tanks, chemical dosing systems, and filtration technologies.
• Develop and optimise chemical dosing regimes (e.g. pH correction, coagulation, flocculation, nutrient dosing).
• Undertake process calculations, mass balances, and performance modeling.
• Support project teams during installation, commissioning, and troubleshooting phases.
• Liaise with clients to understand wastewater characteristics and treatment requirements.
• Ensure all designs comply with environmental regulations and industry standards.
• Contribute to innovation, continuous improvement, and technical excellence within the engineering team.

Required Qualifications

Applicants must meet the below defined requirements for the role.

• Degree‑qualified in Chemical Engineering, Process Engineering, Environmental Engineering, or similar discipline.
• Proven experience in industrial wastewater or effluent treatment process design.
• Strong understanding of chemical dosing systems and treatment chemistry.
• Experience with treatment technologies such as DAF, MBBR, SAFS, membrane systems, and dewatering screw presses (or similar).
• Ability to produce and interpret PFDs and P&IDs accurately.
• Strong analytical, problem‑solving, and technical decision‑making skills.
• Comfortable working independently and collaboratively within multidisciplinary project teams.
• Excellent communication skills with both technical and non‑technical stakeholders.

What’s in it for you?

• A key technical role within a growing wastewater engineering team.
• Access to Mitie’s Choices lifestyle benefits platform, including extra holiday purchase, dental and critical illness cover, and technology schemes.
• Virtual GP access for you and your household.
• Financial wellbeing support through Salary Finance.
• MiDeals high‑street discounts, cycle‑to‑work scheme, and gym offers.
• Life cover up to 4× salary, enhanced pension contributions, save‑as‑you‑earn scheme, and the Mitie Matching Share Plan (with potential free shares).
• Recognition through Mitie Stars, with monthly cash prizes and an annual £10,000 award.
• Strong focus on career development, training, and long‑term progression.

There’s a place for you at Mitie, join us today!