Principal Process Engineer

Location: Exeter

Mott MacDonald Bentley (MMB) is a fully integrated design and build business combining the expertise of Mott MacDonald and the contracting experience of JN Bentley. MMB delivers award‑winning water and wastewater projects across the UK, supporting large‑scale schemes from feasibility to construction. With an annual turnover of over £500 million, MMB offers a stable environment for professional growth.

The Role Of a Principal Process Engineer

• Lead and oversee the design, planning, and execution of process engineering on projects.
• Provide design support and guidance for schemes, ensuring designs meet current legislation and standards.
• Collaborate closely with commercial, operational and construction teams to develop efficient, practical and safe solutions across all project stages.
• Engage positively with the client, managing relationships and adopting a one‑team approach to help them achieve their aims.
• Manage interfaces and integration of process design with other disciplines and produce documentation.
• Act as technical checker on project documents and conduct technical reviews across teams.
• Identify opportunities to improve delivery processes, including development and implementation of standard designs, sustainable solutions and digital tools.
• Undertake site reviews to ensure buildability of solutions and integration within existing systems.
• Support the development of the process engineering team, coaching and mentoring engineers.

What You’ll Need

• Degree in Process Engineering or a related field.
• Chartered Engineer (CEng) with a relevant Engineering Institution.
• Proven ability to manage multiple projects and meet deadlines.
• Experience of successfully delivering high‑quality outputs in accordance with design, quality and safety standards.
• Excellent communication skills with team members and stakeholders.
• Willingness to travel to sites in your operational region.
• Experience in water or wastewater engineering.

Benefits

Financial well‑being

• MMB matches employee pension contributions between 4.5 % and 7 %.
• Annual bonus schemes shared with all colleagues.
• Annual professional institution subscription costs covered.

Health and well‑being

• Minimum of 33 days holiday per year, inclusive of public holidays. Ability to buy, sell or carry over leave through a flexible benefits programme.
• Access to Life Assurance, Private Medical Insurance, Critical Illness Insurance and Health Screening options.
• Support for flexible working arrangements to balance work and personal responsibilities.
• Wide range of advanced employee networks supporting LGBTQ+, gender, race and ethnicity, disability, and parents/carers communities.

Enhanced family and carers leave

• 26 weeks paid maternity and adoption leave, two weeks paid paternity/partner leave and option for shared parental leave.
• Up to two additional paid leave days for those with significant caring responsibilities.

Learning and development

• Structured development schemes supporting progression toward professional chartership, including mentorship and tailored training opportunities.
• Mott MacDonald Bentley does not sponsor Skilled Worker visas in the UK. Applicants must be eligible for alternative immigration routes that do not require sponsorship.

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