Overview
ACCIONA is delivering Western Harbour Tunnel – Stage 2, Sydney's third harbour crossing. The new Western Harbour Tunnel (WHT) will connect to WestConnex at the Rozelle Interchange, cross underneath Sydney Harbour between Birchgrove and Waverton, and connect with the Warringah Freeway near North Sydney.
The Project
ACCIONA has been selected to deliver Western Harbour Tunnel – Stage 2, Sydney's third harbour crossing. The project involves construction of approximately 4.8 kilometres of mainline tunnels with three lanes in each direction; civil, mechanical and electrical fitout of Stage 1 and Stage 2 tunnels; and surface level work, including on- and off-ramps and tie-in work to the Warringah Freeway.
Project Scope
Construction of approximately 4.8 kilometres of mainline tunnels with three lanes in each direction
Civil, mechanical and electrical fitout of Stage 1 and Stage 2 tunnels
Surface level work, including on and off ramps and tie-in work to the Warringah Freeway
The Opportunity
In line with the above, ACCIONA is seeking a Senior Mechanical Engineer within the engineering support team. The Senior Mechanical Engineer will play a critical role in the delivery phase of the Western Harbour Tunnel project, providing expert technical guidance and engineering support to the construction team to ensure that mechanical systems are delivered to specification, on schedule, and in compliance with relevant standards and project requirements.
Key Accountabilities For The Position
Respond promptly and accurately to queries raised by the construction team, providing clear and practical engineering solutions.
Review and interpret design documentation, specifications, and construction drawings to support on-site execution.
Take ownership of existing mechanical designs by conducting thorough review and familiarisation, enabling informed and confident advice to the broader engineering and delivery teams.
Liaise with design consultants, contractors, and internal stakeholders to resolve mechanical engineering issues during construction.
Ensure all mechanical works comply with project standards, relevant codes (e.g. AS/NZS), and safety requirements.
Contribute to risk assessments, change management processes, and engineering reviews.
Maintain accurate records of technical decisions, correspondence, and engineering changes.
Provide mentoring and technical leadership to junior engineers within the support team.
Required Skills And Competencies
Bachelor's degree in Mechanical Engineering.
Prior experience in Mechanical engineering, ideally within transport infrastructure or tunnel projects.
Strong understanding of construction methodologies, mechanical systems (e.g. MVAC, ventilation, fire safety, hydraulics), and relevant standards.
Proven ability to manage technical queries and interface with multidisciplinary teams.
Excellent communication, documentation, and stakeholder engagement skills.
Experience working on major infrastructure projects in Australia is highly desirable.
About ACCIONA / EEO
ACCIONA has been awarded Top Employer for 2022, 2023, 2024 & 2025 in Australia. The company employs more than 3,000 people in its renewable energy, infrastructure and water projects across Australia & New Zealand. We are an Equal Opportunity Employer and promote equality and diversity. Indigenous Australians and candidates from minority groups are encouraged to apply.
Position details
Seniority level: Associate
Employment type: Full-time
Job function: Other
Industries: Utilities
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