Lead Mechanical Engineer HVAC/Building Services (Hybrid)

Amentum; Bristol; Hybrid; GBP 60,000 - 80,000; Full time

Job summary

A leading engineering firm in Bristol seeks a Lead Mechanical Engineer specializing in HVAC and building services. This hybrid role involves designing systems for critical nuclear and defence projects. Ideal candidates have a Mechanical Engineering background and experience with CIBSE guides. Exceptional work-life balance and ongoing professional development are prioritized, alongside a commitment to diversity and inclusion.

Benefits

Free medical cover

Enhanced parental leave pay

Professional development reimbursement

Qualifications

• UK National with willingness to obtain SC level security clearance.
• Experience in production of design deliverables and commissioning mechanical systems.
• Familiarity with engineering software and strong problem-solving skills.

Responsibilities

• Design and engineer HVAC systems for nuclear and defence projects.
• Collaborate within a multi-discipline engineering team.
• Ensure compliance with safety and regulatory standards.

Skills

Mechanical Engineering

CIBSE guides

Plant sizing calculations

Engineering software (CAD, Hevacomp, BIM)

Stakeholder liaison

Education

Relevant Mechanical Engineering education

Job description

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Lead Mechanical Engineer HVAC/Building Services (Hybrid), Bristol

Client: Amentum

Location: Bristol, United Kingdom

Job Category: Other

EU work permit required: Yes

Job Reference: 83f3306669f6

Job Views: 5

Posted: 12.08.2025

Expiry Date: 26.09.2025

Job Description:

Our Defence and Security teams provide design and engineering services for our nuclear and defence clients across the UK and abroad. Our team is experiencing exciting growth and long-term prospects within our established practice, and we are looking for Mechanical/HVAC engineers with transferable skills who are passionate about developing themselves and in meeting new challenges. We offer hybrid working with 1-2 days in the office. Occasional site visits may be necessary.

About the opportunity:

We are looking to recruit and develop career minded people to bolster our well-established and growing multi-discipline engineering delivery capability to meet 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, and both existing and new build nuclear power stations.

You will preferably have experience of working in the nuclear and/or defence industries, but also those with relevant industrial design experience looking to work in a technically challenging environment. In this role you be part of a several hundred strong team across the UK, working within the Mechanical Engineering team based in Glasgow, Warrington, Bristol, Or Reading.

• Occasional expensed business travel to Client sites.
• Strong client base with a full steam of projects

We’ll inspire and empower you to deliver your best work so you can evolve, grow and succeed - today and into tomorrow. We offer an exciting range of opportunities to develop your career within a supportive and diverse team who always strive to do the right thing for our people, clients and communities.

People are our greatest asset, and we offer a competitive package to retain and attract the best talent. In addition to the benefits you’d expect, UK employees also receive free single medical cover and digital GP service, family-friendly benefits such as enhanced parental leave pay and free membership of employee assistance and parental programmes, plus reimbursement towards relevant professional development and memberships. We also give back to our communities through our Collectively program which incorporates matched-funding, paid volunteering time and charitable donations.

Work-life balance and flexibility is a key focus area for us. We’re happy to discuss hybrid, part-time and flexible working hours, patterns and locations to suit you and our business.

• Relevant Mechanical Engineering education.
• Experience in the use of CIBSE guides
• Experience in the production of design deliverables. Plant sizing calculations (heating/ cooling/ fan sizing) and commissioning of a diverse range of mechanical building systems
• Familiarity with engineering software packages such as CAD, Hevacomp, BIM and simulation packages
• Can liaise with multiple stakeholders and coordinate with other design disciplines.
• Experience in producing tender specifications for mechanical building services.
• You must be a UK National and able/willing to obtain SC level security clearance, which includes resident in the UK for the preceding 5 years

Our Culture:

Our values stand on a foundation of safety, integrity, inclusion and diversity. We put people at the heart of our business, and we genuinely believe that we all succeed by supporting one another through our culture of caring. We value positive mental health and a sense of belonging for all employees.

We aim to embed inclusion and diversity in everything we do. We know that if we are inclusive, we’re more connected, and if we are diverse, we’re more creative. We accept people for who they are, regardless of age, disability, gender identity, gender expression, marital status, mental health, race, faith or belief, sexual orientation, socioeconomic background, and whether you’re pregnant or on family leave. This is reflected in our wide range of Global Employee Networks centered on inclusion and diversity.

We partner with VERCIDA to help us attract and retain diverse talent. For greater online accessibility, please visit to view and access our roles. 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.