Senior Mechanical Engineer

Join to apply for the Senior Mechanical Engineer role at Mott Mac Donald Bentley | MMB

Internal applications are welcome. Mott Mac Donald Bentley is a fully integrated design and build business combining the design expertise of Mott Mac Donald with the contracting experience of JN Bentley to deliver award‑winning projects. With an annual turnover surpassing £500 million, MMB cements its position as a leader within the industry, creating an ideal environment for career growth.

MMB has extended its contract with Thames Water for an additional five years. As the largest water and wastewater provider in the UK, Thames Water serves 15 million customers throughout London and the Thames Valley. This extension will carry the current workload beyond the end of AMP8 in March 2030, covering work across the Thames Valley region from Cirencester to the M25 and from Basingstoke to Banbury.

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. You’ll work on projects that enhance the efficiency and effectiveness of water and wastewater treatment systems.

• Develop 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 & lifting arrangements, and above‑ground pipework layouts.
• Coordinate with the project team comprising 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 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.

• Degree in Mechanical Engineering, or related field.
• Working towards IEng / CEng with a relevant Engineering Institution.
• 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 matches employee pension contributions between 4.5% and 7%.
• As an independently owned business we share the financial success of the business with all our colleagues, including our annual bonus schemes.
• Payment of annual professional institution subscription costs.

• Minimum of 33 days holiday each year, inclusive of public holidays, with the ability to buy, sell or carry over annual leave through our flexible benefits programme.
• Access to Life Assurance, Private Medical Insurance, Critical Illness Insurance and Health Screening options.
• We are happy to talk openly about flexible working and how we can support your responsibilities beyond the workplace.
• Join a wide range of groups including our Advanced Employee Networks which support our LGBTQ+, gender, race and ethnicity, disability, and parents/carers communities.

• Enhanced family leave policies, including 26 weeks paid maternity and adoption leave, and two weeks paid paternity/partner leave plus the option for shared parental leave.
• Up to 2 paid additional days leave are provided for those with significant caring responsibilities.

• MMB are committed to empowering our people to grow professionally and thrive in their careers. We offer structured development schemes that support your journey toward professional chartership. From day one, employees are fast‑tracked towards chartership reviews and benefit from mentorship, hands‑on experience, and tailored training opportunities.

Mott Mac Donald Bentley are not currently offering sponsorship to candidates under the Skilled…