Senior Mechanical Engineer – HVAC, Plumbing & Fire Systems
DORNA PTY LTD Sydney
About DORNA
DORNA is a reputable, family-owned Australian builder delivering high-quality commercial, industrial, and refurbishment projects across New South Wales.Committed to integrity, innovation, and insight, we offer end-to-end construction and building services across Sydney’s commercial, industrial and multi-storey projects.
Due to strong project growth in NSW, we are seeking an experienced and highly capable Senior Mechanical / Building Services Engineer to join our Sydney team.
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The OpportunityThis senior engineering role will lead the design, review, installation oversight, and sign-off for mechanical building services across our NSW projects, including:
- HVAC (VRF/VRV, chilled water, mechanical ventilation)
- Plumbing & hydraulic systems
- Fire-fighting systems
- Mechanical building services for commercial & industrial sites
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Key Responsibilities- Lead design and documentation of HVAC, plumbing, hydraulics, and fire systems for NSW commercial and industrial buildings.
- Perform heat-load, air handling, pump and pipe sizing, static pressure, and flow calculations.
- Prepare and sign engineering design packages (Form 15/16 equivalent NSW documentation where applicable).
- Use Revit MEP, AutoCAD MEP, CAMEL/HAP, WaterCAD and other tools to deliver full mechanical design documentation.
- Oversee mechanical services installation across Sydney sites.
- Ensure compliance with NSW Building Code, NCC Vol. 1, local council requirements, and AS/NZS standards including:
o AS/NZS 3500 (plumbing & drainage)
o AS 2419 & AS 2941 (fire hydrant & fire pump systems)
o AS 2118 (sprinkler systems)
- Conduct inspections, commissioning, performance validation and system sign-off.
- Coordinate with NSW building certifiers, fire safety assessors, hydraulic consultants, councils and service trades.
- Prepare O&M manuals, ITPs, commissioning plans, defect reports and compliance documentation.
Skills & Qualifications
Essential
- Bachelor’s degree in mechanical engineering.
- CPEng and/or eligibility to become an NSW Registered Professional Engineer (under the NSW Design & Building Practitioners Act – Mechanical).
- Minimum 5 years’ experience in building services (HVAC, plumbing, fire).
- Strong familiarity with NSW building approvals process and dealings with building certifiers.
- Proficient with one of: Revit MEP, AutoCAD MEP, CAMEL / HAP, WaterCAD / EPANET
- Strong understanding of NCC/BCA (NSW requirements), Fire Safety Schedules, and Annual Fire Safety Statements (AFSS) obligations.
- Current NSW Manual Driver Licence.
- White Card (Construction Induction).
- Experience with Sydney commercial fitouts, industrial upgrades, or refurbishment projects.
- Background in fire system certification, FPAS, or coordination with fire safety practitioners.
Why Work with DORNA
- Competitive salary package of $90,000 – $110,000 + super
- Autonomy and authority to lead and sign-off mechanical building services.
- Work on landmark Sydney commercial and industrial projects.
- Supportive, collaborative team culture built on quality and integrity.
- Career development, including assistance for NSW professional engineering registration.
- Opportunity to influence design excellence within a respected construction company.
How to Apply
Click Apply Now with:- Your updated resume
- A one-page cover letter
Applications will be reviewed as they are received.
Note: Australian Citizens and Permanent Residents will be preferred. Other applicants with full work rights can apply only if they meet the above criteria.
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