Senior Mechanical Engineer

Senior Mechanical Engineer – Water & Wastewater Projects

As a Senior Mechanical Engineer you will contribute to projects that significantly impact our environment and communities. Working primarily in the UK water market, MMB provides the feasibility, design, construction, and commissioning services needed to keep water flowing and wastewater treated.

• Lead the mechanical design of water and wastewater infrastructure and non‑infrastructure projects through outline and detailed design, construction, commissioning, and handover, including P&IDs, valve schedules, pump calculations, safe access and lifting arrangements, above ground pipework layouts, etc.
• Coordinate with the project team comprising of Electrical, Civil, Geotech and Process designers to ensure designs are completed on programme, within budget, and to the quality defined by framework specifications.
• Work closely and collaboratively with the commercial, operational and construction teams to develop efficient, practical and safe solutions throughout design stages, construction and beyond.
• Positively engage with the client, managing relationships and adopting a one‑team approach to supporting them in achieving their aims.
• Support the development of the mechanical engineering team, coaching and mentoring engineers to develop their skill set and identifying the correct resource for the projects.

• Degree in Mechanical Engineering, or related field.
• Chartered or incorporated member of a professional institution e.g. ICE, IMechE, or equivalent experience.
• Ability to communicate effectively with team members and stakeholders.
• Methodical approach to problem solving.
• A valid driving licence and willingness to travel to sites across your operational region.

• MMB match employee pension contributions between 4.5% and 7%.
• Independently owned business pays annual bonus schemes.
• Payment of annual professional institution subscription costs.
• A minimum of 33 days holiday each year, inclusive of public holidays, with the ability to buy, sell or carry over annual leave.
• Access to Life Assurance, Private Medical Insurance, Critical Illness Insurance and Health Screening options.
• Flexible working arrangements.
• Participation in employee networks supporting diversity and inclusion.
• Family and carers leave – paid maternity, adoption, paternity/partner leave, shared parental leave, additional days for caring responsibilities.
• Learning and development opportunities and fast‑tracked path to chartership.

Mott Mac Donald Bentley are not currently offering sponsorship to candidates under the Skilled Worker visa route in the UK. This is due to changes made to the Skilled Worker route by the UK Government in April 2024. We continue to welcome applications from candidates who are eligible for alternative immigration routes in the UK that do not require sponsorship as a Skilled Worker now or in future.

We are committed to ensuring that our recruitment practices are barrier‑free and inclusive. For assistance with the application process, please call or email  You can read more about our Equal Opportunities Policy here:
Equality, diversity and inclusion - Mott Mac Donald.