Principal Mechanical Engineer - PTLS

About this role

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.