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Lead Mechanical Engineer HVAC/Building Services (Hybrid)

Reading, GBR; Reading; Reading,; United Kingdom
Full Time On-site

Summary

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.

Here’s What You’ll Need:

  • Relevant Mechanical Engineering education.
  • Experience in the use of CIBSE guides
  • Experience in the production of design deliverables. e.g. 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.
  • UK Nationality: Applicants must be sole UK Nationals, willing to obtain SC level security clearance, and have resided in the UK for the preceding 5 years.

Our Culture

Our values are built on a strong foundation of safety, integrity, and respect for every individual. People are at the heart of our mission, and we believe in supporting one another through a culture of care and collaboration.

We strive to create a workplace where everyone feels they belong and can thrive. Supporting mental wellbeing and fostering a sense of connection are essential to how we work.

When we embrace different perspectives and work together, we become more innovative, more agile, and more successful.

We partner with VERCIDA, for greater online accessibility please visit www.vercida.com 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.

If you require further support or reasonable adjustments with regards to the recruitment process (for example, you require the application form in a different format), please contact the team.

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 (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), 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. Learn more about your rights under Federal laws and supplemental language at Labor Laws Posters (https://postings.govdocs.com/#/vxSkbztPuAwwxfs) .

About Amentum

Amentum

Amentum is one of the largest government services and engineering companies supporting the U.S. military, intelligence community, and federal agencies. Headquartered in Virginia with more than 50,000 employees worldwide, Amentum delivers mission-critical support across defense, cybersecurity, engineering, logistics, intelligence, aviation, nuclear, and space operations. The company plays a major role in helping government agencies solve complex national security and infrastructure challenges.

For job seekers, Amentum offers a wide variety of career opportunities across engineering, cybersecurity, intelligence, logistics, IT, aviation maintenance, program management, and cleared government support roles. The company is especially attractive to veterans, transitioning military personnel, and security-cleared professionals looking to continue supporting national security missions while building long-term career stability. Amentum also has a strong reputation for career mobility, education support, and mission-focused work across hundreds of federal programs.

Unlike many companies focused on a single niche, Amentum supports a broad range of high-impact missions—from military readiness and intelligence operations to NASA programs, cyber modernization, and critical infrastructure support. Employees often work on programs that directly support the Department of Defense, intelligence agencies, and federal civilian missions, creating opportunities to build diverse experience while contributing to meaningful national security outcomes.

As government investment continues to grow in cyber, space, engineering, and mission modernization, Amentum remains one of the strongest employers in the government contracting sector. For professionals seeking a stable, mission-driven career with opportunities for advancement, technical growth, and meaningful impact, Amentum continues to stand out as a top employer in defense and federal services.

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