Jobs at Assystem

Join the Nuclear Decommissioning team to deliver process engineering for asset replacement and new facility design, maintain sample analysis capabilities, inspect active sites, produce technical design deliverables, and collaborate with multi-disciplinary specialists.

Deliver civil and structural (CS&A) design deliverables for a nuclear project: design/assess concrete, steel and masonry structures (including seismic), produce calculations, drawings and reports, review and approve outputs, interface with integrated design and facility teams, perform site visits, and ensure compliance with regulated industry requirements.

Lead the civil and structural design of temporary security enclosures, buffer stores and weatherproof structures. Produce technical drawings and design documentation, coordinate strip-out and modification works, perform site inspections, and support delivery from concept through construction while ensuring buildable, safe CS&A solutions.

Lead process definition, improvement and assurance for the SZC digital and IT change programme. Define and refine processes, manage multiple business change workstreams, quality-assure deliverables, provide oversight of suppliers and systems integrators, ensure business cases include benefits and KPIs, report performance, and mentor junior staff.

Lead and support mechanical engineering for nuclear waste containers and interfaces: capture requirements, review drawings, support DFMEA/PFMEA, compile documentation, mentor senior staff, perform site surveys, and apply lessons learned to ensure compliant design and manufacture.

Lead and support JV civil/structural design and site engineering for nuclear projects. Review and approve design submissions, manage site interfaces, attend regular site and office meetings, support safety case work, and engage with multi-discipline teams and supply chain to resolve construction issues through to As Built status.

Lead and deliver mechanical work scope for a nuclear project: produce and check detailed design work packs, supervise designers, create GA/layout drawings, calculations and technical files for UK CA/machinery compliance, support testing and execution, and liaise with multi-discipline and plant teams under time and cost constraints.

Lead and coordinate project-wide systems engineering activities to define, control, and verify project-level requirements. Ensure multidisciplinary outputs integrate into a compliant system solution, provide technical leadership, manage risks and interfaces, support decision-making and documentation, and champion safety, regulatory, and quality requirements from concept through delivery.

Lead scoping, bidding and delivery of stress engineering work packages for nuclear projects. Provide technical leadership and approvals, perform FEA and hand calculations to justify strength, fatigue and defect tolerance to international codes, mentor junior engineers, grow capability, support recruitment and business development, and represent Assystem with clients and industry bodies.

Serve as Assystem's single-point lead within a joint-venture defence infrastructure framework. Build client relationships, represent Assystem, enable delivery across multiple workstreams, oversee framework operations, manage commercial/account performance, coordinate resources and capability, support bidding and opportunity development, and provide internal leadership and governance representation.

Lead delivery of complex engineering and infrastructure projects in nuclear and defence sectors. Manage scope, schedule, budget, risk, contracts (NEC4), governance, financial forecasting and stakeholder relationships. Support assurance, project controls, bids and ensure compliance with security vetting requirements.

Senior Systems Engineer responsible for requirements specification and management, interface management, system architecture, and functional/interface modelling for mechanical, electrical and process systems. Use requirements management tools (Rational DOORS preferred) and MBSE tools (Capella preferred) within highly regulated industries (nuclear, aerospace, defence), applying systems engineering processes and standards.

Lead company-wide Information Management delivery and capability building. Implement and manage the Common Data Environment (CDE) and Project Information Model (PIM). Coordinate federated 3D models, perform clash detection and reporting, ensure EIR/BEP compliance, maintain records and audit trails, support PIP/AIP and bid preparation, and enforce safety, security, export control, and information governance requirements across regulated projects.

Lead company-wide Information Management (IM) delivery and capability development for complex, regulated infrastructure projects. Manage CDE and PIM structures, coordinate federated 3D models and clash detection, ensure compliance with ISO 19650, EIR and BEP, support PIP/AIP development, maintain records and audit trails, advise on data security and export control, and support bid preparation to maximise data value and project outcomes.

Lead cost and forecasting activities for large-scale HPC programmes, ensuring accurate CBS/WBS-aligned estimates, reporting, and assurance. Provide technical leadership, coach junior cost staff, integrate cost with schedule/risk/change, deliver reports and Power BI insights, and support stakeholder decision-making across complex regulated projects.

Lead programme-area risk management for a nuclear power station project: maintain risk/opportunity registers, provide assurance and reporting, run workshops, integrate risk with cost and schedule, deliver insights to senior stakeholders, and train teams on risk tools and processes.

The Senior Process Engineer will design thermal and fluid systems for SMR projects, ensuring compliance and integrating designs into power plants while managing supplier deliverables and safety standards.

As a Senior Stress Engineer, you will lead assessments, mentor junior engineers, drive capability growth, and support business development within a growing nuclear engineering community.

The Senior Process Engineer will design thermal and fluid systems for nuclear projects, ensure compliance with safety standards, and manage supplier interactions.

The role involves developing project schedules, cost controls, and risk management while supporting project managers and engaging in business development activities.