A leading global hyperscale data centre operator with a rapidly expanding international portfolio is seeking an experienced Senior Mechanical Design Engineer to join its engineering and design team in Sydney, Australia.

Operating at the forefront of digital infrastructure development, the organisation is responsible for delivering large-scale, mission-critical facilities that support the continued growth of cloud computing, artificial intelligence and enterprise technology.

This is an prospect for an accomplished mechanical engineering professional with a strong background in engineering design consultancy to transition into an operator-side role, taking greater ownership of technical design outcomes and contributing to the development of next-generation hyperscale data centres.

The successful candidate will combine strong mechanical engineering expertise with excellent stakeholder management capabilities, a collaborative mindset and the energy to thrive in a dynamic, high-performance environment.

Working alongside internal engineering teams, external design consultants, construction partners and key stakeholders, the individual will play an important role in delivering technically robust, efficient and resilient data centre infrastructure.

Key Responsibilities

Mechanical Engineering Design & Technical Leadership

- Provide technical leadership and engineering expertise across the mechanical design and development of hyperscale data centre facilities.
- Review, evaluate and coordinate mechanical engineering designs throughout the project lifecycle, from concept and schematic design through detailed design,



construction and commissioning.
- Ensure mechanical systems are designed to meet project requirements relating to reliability, resilience, operational efficiency, maintainability and scalability.
- Review critical mechanical infrastructure, including chilled water systems, air-cooled and water-cooled cooling solutions, CRAH/CRAC units, cooling towers, pumps, piping networks and associated control systems.
- Evaluate mechanical system redundancy, capacity planning and cooling strategies to support mission-critical operations.
- Provide technical input on high-density cooling solutions and emerging technologies supporting AI and high-performance computing environments.
- Review engineering calculations, equipment selections, technical specifications and design documentation to ensure alignment with project requirements.
- Identify design risks, technical constraints and opportunities for engineering optimisation.

Design Management & Project Delivery

- Coordinate external mechanical engineering consultants to ensure design deliverables meet required technical standards, project specifications and programme milestones.




- Review consultant design submissions and provide constructive technical feedback to improve design quality and constructability.
- Collaborate with multidisciplinary engineering teams, including electrical, structural, architectural, civil and controls specialists, to ensure effective design integration.
- Support technical design reviews, value engineering exercises and design coordination workshops.
- Work closely with construction and project delivery teams to resolve design-related issues during construction and installation.
- Review technical submissions, equipment specifications, material selections and contractor proposals.
- Support testing, commissioning and integrated systems testing activities to validate mechanical system performance against design intent.
- Contribute to project handover and operational readiness through effective coordination with facilities and operations teams.

Stakeholder Management & Collaboration

- Build and maintain effective working relationships with internal engineering teams, external consultants, contractors, vendors and project stakeholders.
- Act as a key technical interface between design consultants and internal project delivery teams.
- Facilitate design discussions, technical workshops and coordination meetings to ensure alignment across project stakeholders.
- Communicate complex engineering concepts and technical recommendations clearly to both technical and non-technical audiences.
- Demonstrate confidence and sound judgement when challenging design assumptions, resolving technical disagreements and recommending engineering solutions.<

📌 Senior Mechanical Engineer (Sydney)
🏢 Annexion Partners Pte
📍 Sydney