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 opportunity for an accomplished mechanical engineering professional with a solid 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.
- Work collaboratively across different disciplines to resolve engineering challenges while maintaining project objectives.
- Foster a constructive, positive and solutions-oriented working environment.

Engineering Innovation, Sustainability & Continuous Improvement

- Identify opportunities to improve cooling efficiency, energy performance and overall mechanical infrastructure reliability.
- Support the evaluation and adoption of innovative cooling technologies and sustainable engineering solutions.
- Contribute to mechanical design standardisation, engineering best practices and continuous improvement initiatives across the project portfolio.
- Incorporate lessons learned from construction, commissioning and operational feedback into future design improvements.
- Stay informed of evolving industry standards, emerging technologies and developments in hyperscale data centre cooling systems.
- Support the development of engineering solutions that balance technical performance,



capital expenditure, operational efficiency and long-term maintainability.

Key Requirements

- Bachelor's Degree in Mechanical Engineering or a related engineering discipline.
- Approximately 7–10 years or more of relevant mechanical engineering design experience, ideally gained within an established multidisciplinary engineering design consultancy.
- Strong technical background in mechanical building services design, particularly HVAC, cooling systems and associated mechanical infrastructure.
- Demonstrated experience delivering mechanical engineering designs across complex, large-scale or technically demanding developments.
- Experience in data centres, mission-critical facilities or other high-reliability environments would be highly advantageous.
- Strong understanding of mechanical system design principles, equipment selection, cooling capacity, redundancy and energy efficiency.
- Familiarity with relevant Australian engineering standards, building codes and industry design practices.
- Experience coordinating with multidisciplinary consultants, contractors and project stakeholders throughout the design and construction lifecycle.
- Solid technical problem-solving capabilities, with the ability to assess complex engineering challenges and recommend practical solutions.
- Excellent communication, interpersonal and stakeholder management skills.
- Confident engaging with senior stakeholders, technical specialists and external engineering consultants.
- Strong organisational capabilities, attention to detail and the ability to manage competing project priorities.
- A positive, energetic and collaborative professional with a proactive, solutions-oriented approach to engineering challenges.
- Ability to thrive in a fast-paced, evolving environment and contribute positively to team culture.

Why Consider This Opportunity?

This is an opportunity to transition from engineering design consultancy into a global hyperscale data centre operator, gaining greater involvement in the full lifecycle of mission-critical infrastructure development.

The successful candidate will have the prospect to contribute to large-scale data centre developments, work alongside experienced engineering professionals and influence mechanical design strategies that support the next generation of digital infrastructure.

The role offers exposure to complex cooling technologies, high-density computing environments and engineering challenges associated with the continued expansion of AI and cloud infrastructure.

For a technically accomplished mechanical design engineer who enjoys collaborating with people, solving complex engineering problems and contributing to ambitious projects, this position offers an opportunity to accelerate professional growth within a rapidly evolving industry.

📌 Senior Mechanical Engineer - Digital Infrastructure (Sydney based)
🏢 Annexion Partners Pte
📍 Sydney