Graduate Mechanical Building Services Engineer (HVAC) (UK Multiple Locations) in London

Launch Your Career with Our 2026 Graduate Programme! Are you brimming with ambition and ready to make your mark in the professional world? Look no further! Our UK Graduate Programme is designed to catapult you into a thriving career, offering unparalleled opportunities for growth, learning, and success. Join Amentum in September 2026 and help us create a secure and vibrant future.

We are growing and are excited to be hiring for a career minded graduate to bolster our already well established and multi-discipline engineering delivery capability to meet the opportunities in the Nuclear and Defence industries. Our projects include developing solutions through all RIBA stages in highly regulated environments, in support of air, land and sea defence establishments, the UK nuclear submarine fleet, plus both existing and new build nuclear power stations.

In your role as a Mechanical Building Services Engineer you will be part of a several hundred strong team across the UK (however work within the smaller Mechanical Engineering team based in either Glasgow or London). You will gain experience throughout Building Services Engineering in:

• The production of design deliverables (e.g. Plant sizing calculations, heating/cooling/fan sizing).
• The commissioning of a diverse range of Mechanical Building Systems.
• Engineering software packages such as CAD and Hevacomp.
• Liaising with multiple stakeholders and coordinating with other design disciplines.

Why Join Us?

• Exciting Projects: Work with a diverse team of experts from across the UK and beyond to gain insights into our markets and clients.
• Comprehensive Training: Benefit from a structured development programme that covers everything from discipline-specific skills and professional registration to personal development.
• Mentorship: Receive guidance from seasoned professionals who are dedicated to helping you achieve your career goals.
• Career Progression: When you reach the end of the programme, it's just the beginning! You'll be supported to continue to develop your experience and capabilities to help progress your career and achieve professional registration.
• Supportive Community: Our hub-based model is focused in key locations, ensuring that you'll be part of a supportive early careers community with plenty of networking and experiential learning opportunities.

We are looking for candidates who:

• Ability to work effectively within a team but also independently.
• Organisation & Time Management: Ability to juggle multiple tasks and meet deadlines.
• Eager to take ownership, ask questions, and seek out opportunities to grow.

You must be:

• A flexible self-starter, who is keen to drive their career forward.
• Adaptable to change, with a thirst for learning new things.
• Have the permanent right to work in the UK.

Our Graduate Programme assumes that participants are commencing their first professional role post-graduation. To qualify for our Graduate Programme, you must therefore have:

• Completed your first degree no earlier than the summer of 2024.
• Not worked in a similar professional role since graduation.
• Achieved a minimum 2:2 in your first degree.

Selection Process:

• Step 1: Apply Online.
• Step 2: Successful candidates will be invited to complete an online assessment.
• Step 3: Those who are selected will be invited to a final face to face interview with our operations teams.
• Step 4: Selected candidates will be offered an opportunity to join Amentum Graduate Programme in September 2026.

We will close the application window for this role on 31st January 2026, however we reserve the right to close the role sooner should we receive the required number of applications.

What else we provide:

• A flexible workstyle, embracing a hybrid working pattern and supporting those who need to balance work/life commitments a bit differently than others.
• Free single medical cover and digital GP service.
• Reimbursement towards relevant professional development and memberships.
• An inclusive and diverse work environment, embracing the variety of disciplines, cultures, backgrounds and lifestyles of our employees through our Employee Networks.
• A focus on safety, health, and wellbeing, prioritising our people through a supportive culture and positive mental health champion network.

We want you to bring your whole, authentic self to work. As a Disability Confident employer, we will interview all disabled applicants who meet the minimum criteria for a vacancy. We welcome applications from candidates who are seeking flexible working and from those who may not meet all the listed requirements for a role.

If you require further support or reasonable adjustments with regard to the recruitment process (for example, if you require the application form in a different format or would like to discuss the recruitment process in more detail), please contact us and we'll be happy to help. Your application experience is important to us, and we're keen to adapt to make every interaction even better. We welcome feedback on our recruitment process and if you need more from us before deciding to join our company, please contact us here.

Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy, age, ancestry, United States military or veteran status, color, religion, creed, marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law.