SENIOR BIM TECHNICIAN required to work for Principal Contractor JV on the High Speed Rail London Tunnels Programme. 12 Month Contract initially - Inside IR35 North West/West London - Hybrid working arrangements in place. Senior BIM Technician Role Brief: Role is responsible for leading the production, validation, and integration of Stage 5 and As-Built deliverables, ensuring full compliance with BIM and As-Built specifications. Working under the direction of the As-Built BIM Lead, this position supports model updates across shafts, headhouses, and associated assets, ensuring that live Project Information Models (PIMs) accurately reflect redlines, field changes, and progressive construction status, as well as as-built models production for handover. The Senior BIM Technician is responsible for Maintain and update live Stage 5 3D models in coordination with field, design, and supply chain teams, ensuring changes are validated and traceable. Lead the coordination and integration of as-constructed data including redlines, point clouds, FCDs, and survey outputs into the federated model. Ensure all model updates are in alignment with the As-Built Specification. Support DAC submissions by preparing graphical model data that meets required MPDT standards and is fully aligned to asset metadata and AIM expectations. Drive issue resolution between construction and design inputs through active clash detection and model review cycles. Collaborate with Asset Information Coordinators to