Civils; 3D Designer

The Opportunity

Amentum is the Design and Engineering partner for Sellafield under the PPP (Programme and Project Partners). This is a 20-year arrangement to deliver ~£7bn of major projects. We are looking to recruit high value expertise from across regulated and comparable sectors to work in a collaborative environment. PPP is delivering major projects, site wide improvements and provision of supporting services.

You will be specifically working on the Enabling works package to support the development of a treatment facility for SIXEP and SCP secondary waste.

As a Civil (3D) Designer, works will include service diversions; development of service and drainage schemes; earthworks; vehicle tracking; road layouts; developing new schemes connecting into existing infrastructure; producing foundation drawings and details.

• Model Management
  - Create and maintain complex 3D surfaces using points, break lines, and boundaries.
• Corridor Design
  - Develop intelligent 3D roadway models using alignments, profiles, and custom assemblies.
• BIM Workflow
  - Implement and manage Data Shortcuts to maintain a "single source of truth" across multi-disciplinary project teams.
• Automated Production
  - Set up and manage Sheet Set Manager and Plan Production tools to generate high-volume construction sets (Plan/Profile/Cross-Section) with minimal manual editing.
• Analysis & Reporting
  - Perform earthwork volume calculations, interference checks (clash detection), and pipe network analysis.
• Attending regular model reviews/space management meetings and be able to represent CS&A and present the model.
• Working closely with CS&A Engineers/Architects and modelers from other disciplines to co-ordinate the development of the model.
• Understanding and fulfilling the Designer role under the CDM Regulations.

• Civil / structural engineering MEng or equivalent
• Experience using Revit and Autodesk Design Review to produce and review GA and detail drawings in a Building Information Modelling (BIM) environment.
• Experience using British and European Standards and Building Regulations, and the methodologies required when detailing elements.
• Experience in detailing below ground drainage and services; groundworks; steelwork and reinforced concrete.
• Experience working in an industrial/heavy civils environment
• Experience of using Autodesk Civil 3D;
  Revit;
  Autodesk Design Review and Vehicle Tracking.

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.

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.

Our values are built on a strong foundation of safety, integrity, and respect for every individual. People are at the heart of our mission 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  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.