Mechanical BIM Modeler

About the Role

UNIMAC is seeking an experienced Mechanical BIM Modeler to join its Digital Delivery / BIM team in Riyadh, Saudi Arabia. This full-time role requires a technically skilled BIM professional with expertise in mechanical and hydraulic systems modeling, infrastructure utilities, advanced Revit family creation, Civil 3D, and Dynamo automation. The successful candidate will be responsible for delivering accurate LOD 500 As-Built BIM Models, coordinated drawings, and structured asset information in accordance with project requirements and international BIM standards.

Key Responsibilities

• Develop and maintain detailed 3D BIM models for mechanical, hydraulic, irrigation, water supply, fire protection, and wastewater networks.
• Produce accurate LOD 500 As-Built models reflecting actual site installation, verified survey information, and approved material submittals.
• Develop mechanical equipment, piping, valve, and pump families using Autodesk Revit.
• Prepare as-built drawings, sections, schematics, schedules, and quantity take-offs.
• Manage mechanical and hydraulic BIM coordination, including clash detection and resolution across multidisciplinary models.
• Develop and maintain Civil 3D pressure and gravity pipe networks, custom parts, fittings, and project content catalogs.
• Create and maintain Dynamo scripts to automate modeling, parameter population, quantity extraction, and model quality checks.
• Ensure accurate asset information, equipment tagging, COBie data, and Asset Register deliverables.
• Coordinate with engineering, construction, survey, QA/QC, and document control teams to ensure model accuracy and timely submissions.
• Ensure compliance with project BIM Execution Plans (BEP), ISO 19650, EIR, AIR, and client digital delivery standards.
• Manage model submissions and information exchanges through Autodesk Construction Cloud (ACC) and Aconex.

Technical Requirements

Candidates should demonstrate strong practical knowledge of:

• Autodesk Revit: Mechanical systems, piping networks, advanced family creation, and shared parameters.
• Autodesk Civil 3D: Pressure and gravity pipe networks, fittings, parts lists, and data shortcuts.
• Dynamo: Workflow automation, Python/CPython3 scripting, and data management.
• LOD 500: As-built modeling, survey coordination, and asset information management.
• COBie & Asset Register: Asset data population, validation, and handover.
• Navisworks / Revizto: Model federation, clash detection, and coordination.
• ISO 19650: BIM information management and Common Data Environment (CDE) workflows.
• Autodesk Construction Cloud (ACC) / Aconex: Model publishing and document management.

Qualifications and Experience

• Diploma or Bachelor's degree in Mechanical Engineering or a relevant technical discipline.
• Minimum of 5 to 10 years of relevant BIM modeling experience, preferably within infrastructure, utilities, or large-scale construction projects.
• At least 3 years of hands-on experience in external wet utilities, irrigation, or infrastructure projects.
• Proven experience delivering LOD 500 As-Built BIM models.
• Strong practical experience in Revit, Civil 3D, and Dynamo.
• Experience in COBie, Asset Registers, and BIM handover documentation.
• Good understanding of multidisciplinary BIM coordination and construction requirements.
• Excellent communication, analytical, and problem-solving skills.

Preferred Qualifications

• Previous experience working on major infrastructure or giga-projects in Saudi Arabia, such as Qiddiya, NEOM, Red Sea Global, or Diriyah.
• Autodesk professional certifications in Revit or Civil 3D.
• Knowledge of Autodesk Inventor and advanced Dynamo/Python automation.
• ISO 19650 certification or relevant BIM training.