Mechanical Specialist

Job description / Role

Job description

WSP in the Middle East is currently hiring a specialist - mechanical - metro stations to join our team in Riyadh, Saudi Arabia. The successful candidate will own the end-to-end mechanical station fit-out design for rail, metro, and train stations covering HVAC, environmental control, smoke control/TVS, stairwell/room pressurization, cooling of technical spaces, and integration with BMS/SCADA through concept, schematic, detailed/IFC, tender, and construction support.

Responsibilities

• Lead station HVAC and ventilation design (underground, at-grade, elevated): cooling/heating load estimates, plant sizing (chilled water/DX/VRF), AHU/FAHU/FCU selection, filtration strategy (sand/dust), ventilation/pressurization of platforms, concourses, back-of-house, and plantrooms.
• Engineer smoke control and TVS: fan, shaft and damper sizing/arrangement; platform and concourse smoke layer management; stair and lift lobby pressurization; PSD heat load coordination; emergency modes and control logic.
• Technical room cooling and resilience: N+1 redundancy and environmental control for S&T/relay/SCADA/UPS rooms, communications and data spaces; thermal runaway risk checks and alarm set-points.
• High-ambient design: equipment derating, coil selections, corrosion mitigation, airside economizer feasibility, sand ingress protection, acoustic and indoor air-quality criteria.
• Digital delivery: Revit/AutoCAD and Navisworks BIM coordination, clash prevention, interface matrices; structured model reviews and info-exchange (BEP compliance).
• Calculations and deliverables: basis-of-design, detailed calculations, P&IDs/schematics, control sequences, layouts/sections/details, equipment schedules, specifications/BOQs, performance ERs.
• Analysis and verification: CFD/FDS for smoke and comfort, SES or equivalent for tunnel/station ventilation where applicable; egress and fire strategy interface workshops.
• Approvals and stakeholders: manage KSA authority submissions; lead multidisciplinary design reviews; run value engineering and risk registers.
• Construction support: respond to RFIs, review vendor submittals, witness FAT/SAT, support T&C and seasonal commissioning.
• Team leadership: mentor engineers/designers; plan workloads, QA/QC deliverables, and contribute to proposals/level-of-effort.

Qualifications

• Bachelor's or master's degree in electrical engineering.
• Professional registration (e.g., CEng/PE) strongly preferred.
• 12-18+ years in building services with major rail/metro station HVAC/ventilation delivery in design consultancy; GCC experience strongly preferred.
• Proven expertise in:
  • Station HVAC, ventilation and smoke control/pressurization to NFPA/EN standards.
  • Cooling of critical technical rooms with resilience (N+1, duty/standby).
  • Writing control philosophies/sequences and BMS/SCADA integration.
  • BIM coordination (Revit/Navisworks) and production of IFC-ready deliverables.
  • Tools: HAP/IES/TRACE (or equivalent), CFD/FDS, SES (or similar), MS Office.
  • Strong stakeholder skills and the ability to lead workshops with client, operator, and authorities.

Nice to have

• District cooling interface design; energy modelling/optimization for high-ambient climates.
• Experience with tunnel ventilation interactions and evacuation scenarios in multi-station corridors.
• Prior approvals experience with Riyadh Civil Defense/SBC.
• RAMS familiarity (EN 50126/8/9) and reliability-led design.

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