Principal Mechanical Engineer - PTLS

ALTEN is a global engineering and technology consultancy operating across over 35 countries worldwide. We partner with industry leaders across sectors including Aeronautics, Aerospace, Defence, Naval, Automotive, Energy, Rail, IT and many more to deliver innovative engineering solutions that drive technological advancement & support sustainable transformation.

Our teams of passionate and agile engineers work on cutting-edge projects that shape the future of technology and sustainability. At ALTEN, we empower talented engineers to innovate, solve complex challenges, and deliver impactful solutions that build tomorrow’s world—today.

Join us and start building tomorrow’s world today!

Join ALTEN and play a key role in the delivery of major nuclear new-build programmes that will help shape the future of low-carbon energy generation. You will provide technical leadership across Pools, Tanks, Liners and Sumps (PTLS) systems, supporting complex engineering challenges from design through to manufacturing and construction. Working within a multidisciplinary engineering environment, you'll contribute to the successful replication and optimisation of critical infrastructure across large-scale nuclear projects while ensuring the highest standards of safety, quality, and technical excellence.

Location: Bristol

On-site Requirement: 3 days on-site

Seniority: Mid-Level

Security Clearance: Candidates must be willing and eligible to obtain BPSS clearance.

Key Responsibilities

Provide technical oversight and engineering leadership across assigned PTLS scope areas.

Review and approve contractor technical deliverables to ensure compliance with project requirements and applicable standards.

Support tender evaluations and supplier assessments from a technical perspective.

Resolve technical issues arising during manufacturing, installation, and construction activities.

Participate in inspections, design reviews, technical meetings, and engineering governance activities.

Promote lessons learned and support replication strategies across major nuclear infrastructure programmes.

We are seeking Mechanical Engineers with experience in nuclear or highly regulated industries who can provide technical oversight across complex infrastructure projects. The ideal candidate will have strong experience in design review, manufacturing support, construction interfaces, and stakeholder engagement within multidisciplinary engineering environments.

Required Skills

Proven experience working with Pools, Tanks, Liners and Sumps (PTLS) systems.

Strong knowledge of nuclear civil structures and embedded metallic components.

Experience with fabrication, welding, and installation methodologies.

Understanding of nuclear quality assurance processes and regulatory requirements.

Experience supporting design integration and construction sequencing activities.

Soft Skills & Collaboration

Strong communication skills with the ability to engage effectively with contractors, suppliers, and project stakeholders.

Ability to collaborate within multidisciplinary engineering and construction teams.

Strong problem-solving skills with a proactive approach to technical issue resolution.

Ability to manage priorities and deliver high-quality engineering output within programme timescales.

Required Qualifications

Bachelor's or Master's degree in Engineering, or relevant technical military background with equivalent experience.

Desirable Skills

Experience working on nuclear projects.

Demonstrated capability in design review, manufacturing oversight, and construction support.

Familiarity with RCC-M, RCC-CW, Eurocodes, and applicable UK nuclear requirements.

Experience supporting large-scale infrastructure or nuclear new-build programmes.

Why join us?

We bring together entrepreneurial, tech-driven people to deliver innovative solutions for leading companies.

At ALTEN, you’ll work on exciting projects, supported by ongoing learning, mentoring, and clear career development tailored to your goals.

Join a passionate team and help build tomorrow, today.

In short you get:

A personalised career path and a rewarding management style

A huge diversity of engineering projects and industries

Private Medical Insurance

Cycle & Tech Scheme

Employee assistance programme

Life insurance & Pension Scheme

Social atmosphere, regular gatherings & team buildings

Flexible way of working (role dependent)

We are proud to support the Armed Forces Covenant & actively encourage applications from members of the Armed Forces community, including veterans, reservists, service leavers, and military spouses/partners. We recognise the value of military skills and experience and are committed to ensuring that no applicant is unfairly disadvantaged during our recruitment and selection processes.

ALTEN is committed to fostering a diverse and inclusive workplace and values the strength that comes from a global mix of backgrounds and perspectives. We welcome applications from all suitably qualified candidates, regardless of background or protected characteristics under the Equality Act 2010. If you require any reasonable adjustments during the recruitment process, please let us know.

This role may require you to have or be willing to go through Security Clearance. As part of the onboarding process candidates will be asked to complete a Baseline Personnel Security Standard; details of the evidence required to apply may be found on the government website Gov.UK. If you are unable to meet this and any associated criteria, then your employment may be delayed, or rejected . Details of this will be discussed with you at interview.