Senior Project Engineer (Mechanical)

Do you have 8–10 years’ experience in mechanical building services design, ideally across defence or complex commercial projects?


Have you successfully led multi-disciplinary engineering project teams, managing budgets, resources, and client relationships?


Are you looking to take on prestigious UK defence projects, where your work directly impacts critical national infrastructure?


The Opportunity
Our client, a London-based engineering team are expanding their team to meet growing demand across UK defence projects. This is an exciting opportunity to join a global consultancy that prides itself on delivering excellent work, where every project matters.


As a Senior Mechanical Engineer, you’ll take ownership of medium-to-large scale projects, leading design from concept through to delivery. You’ll collaborate across multiple disciplines, drive technical excellence, and build long-term client partnerships that shape repeat success.


In return, you’ll gain exposure to high-profile defence projects, professional growth through mentoring and training opportunities, and the chance to be part of an organisation that values innovation, collaboration, and integrity.


Your duties and responsibilities will be:
Lead delivery of mechanical building services designs from concept to construction.
Act as Project Leader on medium-to-large projects, ensuring on-time, on-budget delivery.
Coordinate multi-disciplinary teams (mechanical, electrical, fire, hydraulics, and more).
Review contractor submissions and oversee construction administration.
Build and maintain strong client and stakeholder relationships.
Mentor and support junior engineers, developing team capability.
You will have the following qualifications & experience:
A recognised mechanical engineering qualification
8–10 years’ engineering experience in mechanical building services design.
Proven project leadership/project management experience with multi-disciplinary teams.
Strong written and verbal communication skills and the ability to influence at all levels.
Knowledge of RIBA Stages 1–4A.
It’s great if you also have the following
Experience with defence sector or large-scale commercial projects.
Familiarity with other disciplines (electrical, public health, fire protection).
Experience mentoring or training junior engineers.
The setting for the role

Millbank Holdings Ltd is an equal opportunities employer committed to creating an inclusive and diverse workforce. We welcome applications from all suitably qualified individuals, regardless of background, and encourage candidates from underrepresented groups to apply.


We are proud to be a member of the Disability Confident Scheme, and we are committed to ensuring an accessible and supportive recruitment process for everyone. If you require any adjustments at any stage, please let us know and we’ll do our best to accommodate.

Millbank operates as both an Employment Agency and an Employment Business